We need answer a legal/calculation question. Need be careful. Need analyze thoroughly. We have rules: 1. Marking requirement constructive notice; before substantial compliance, damages unavailable unless actual notice. 2. substantial compliance = at least 95% distributed patented units marked. 3. Constructive notice begins date substantial compliance begins and continues while compliance remains >=95%. 4. Actual notice requires affirmative communication identifying patent, accused product/conduct, and charging infringement. General awareness, licensing invitation, similar tech insufficient. 5. Once constructive or actual notice begins, damages may be recovered for later infringement through expiration, subject to filing lookback. 6. Six-year lookback: no damages for infringement more than six years before filing. Does not shorten later notice-based start date. 7. Burdens. 8. Use calendar months; each listed month 2000 units; royalty $18/unit. Facts: Patent issued Jan 1, 2022, expired Dec 31, 2025. Marking: Jan 1-Jun 30, 2022: 60% marked. Beginning Jul 1, 2022: 97% marked. Compliance remained >=97 through expiration. DeltaMark sold 2000 units every calendar month from March 2022 through Dec 2025. Oct 15, 2022 email: similar tech, interested in license, no patent no infringement. Feb 1, 2023 letter: identifies patent, Model K, mapping claims, states sales infringed; received that day. Filed Jun 1, 2026. Stipulate all recoverable period infringed, $18/unit. Ignore interest etc. Need calculate: - Whether Jan-Jun 2022 marking rate gave constructive notice. - First constructive-notice date. - Whether Oct 15 email gave actual notice. - Effect of Feb 1 letter. - Six-year filing lookback. - First recoverable damages date. - Number recoverable calendar months and units through expiration. - Total royalty damages. - Damages if Feb 1, 2023 incorrectly used as start date. - Value lost from incorrect start date and unrecoverable Mar-Jun 2022 period. Need consider timeline. Patent issued Jan 1, 2022. Infringing sales start March 2022. Marking insufficient until July 1, 2022: 97%. So constructive notice begins July 1, 2022. But no DeltaMark sales until March 2022; yes. From July 1, 2022 through expiration damages for later infringement. Since infringement every month from March 2022. Constructive notice covers all infringement from July 1, 2022 onward (through Dec 2025). However filing lookback: filed June 1, 2026. Six years before filing: more than six years before June 1, 2026 is recoverable? Usually no damages for infringement occurring more than six years before filing. Need interpret calendar months. "Use calendar months for supplied unit and royalty calculation. Each listed month contains 2,000 infringing units." "A civil action may recover no damages for infringement more than six years before filing. The lookback does not shorten a later notice-based start date." Need determine earliest possible recoverable month based on filing date. Filing June 1, 2026. Six years before is June 1, 2020. Infringement after June 1, 2022 (or March 2022) is within six years, so lookback not limiting. If using calendar months, months after June 1, 2020: July 2020? But infringement starts March 2022. So all March 2022-Dec 2025 are within six years? Check March 2022 is 3 years 3 months before June 2026. Yes. Thus lookback does not cut. Need maybe no damages for infringement more than six years before filing; since all infringement begins 2022 and filing 2026, no pre-June 2020 infringement. So lookback irrelevant. But there is a nuance: first recoverable damages date. If constructive notice begins July 1, 2022, damages may be recovered for later infringement through expiration. Does "later infringement" mean after notice, including same day? Since DeltaMark sales are monthly units; first recoverable calendar month? If notice begins July 1, 2022, all units sold in July 2022 are infringing and occur after constructive notice begins. If each listed month contains 2000 units, we can use July 2022 as first recoverable calendar month. Need ensure no actual notice earlier? Oct 15 email insufficient. Feb 1 letter is actual notice but later than constructive. So actual notice on Feb 1, 2023. It doesn't extend earlier; damages already recoverable from July 1, 2022 due to constructive. It might reinforce but no effect on start date. Question asks "Determine the first recoverable damages date under the supplied marking and actual-notice rules and calculate the royalty window through patent expiration." And assignment: "first recoverable damages date". Could be date or calendar month. Need probably first recoverable damages date = July 1, 2022, or first recoverable calendar month = July 2022. Since each listed month contains 2,000 infringing units, likely count months from July 2022 through December 2025 inclusive. Need number of months. From July 2022 to Dec 2025 inclusive. Let's count: 2022: Jul, Aug, Sep, Oct, Nov, Dec = 6 months. 2023: 12 2024: 12 2025: 12 Total = 42 months. Alternative if first date July 1 2022, through Dec 31 2025, 3.5 years = 42 months. Units 42*2000=84,000. Royalty 84,000*18 = $1,512,000. If February 1, 2023 incorrectly used as start date: Need determine recoverable months. If start date Feb 1, 2023, then first recoverable calendar month = February 2023 through Dec 2025. Count: 2023 Feb-Dec = 11 months; 2024=12; 2025=12; total 35 months. Units 70,000; royalty 70,000*18 = $1,260,000. Difference = $252,000. Value lost from incorrect start date? The question asks "The value lost from that incorrect start date and the unrecoverable March through June 2022 period." Need parse: They want two things? "The value lost from that incorrect start date and the unrecoverable March through June 2022 period." Could mean calculate: (a) value lost from using Feb 1 2023 incorrectly (i.e., July 2022-Jan 2023 omitted) = $252,000; and (b) value of unrecoverable March through June 2022 period (no notice, no actual notice) = maybe $144,000. Or "value lost from that incorrect start date and the unrecoverable March through June 2022 period" maybe combined? Need read: "The value lost from that incorrect start date and the unrecoverable March through June 2022 period." It may ask: the value lost from that incorrect start date [Feb 1, 2023] and [also calculate] the unrecoverable March through June 2022 period. So give both: incorrect start date loses July 2022-Jan 2023 value (7 months * 2000 * 18 = $252,000). Unrecoverable March-June 2022 (4 months * 2000 * 18 = $144,000). But maybe "value lost from that incorrect start date and the unrecoverable March through June 2022 period" could mean total value lost due to both issues: incorrect start date (July-Dec 2022? Wait incorrect start Feb 2023 excludes July 2022-Jan 2023; but some of that includes months after actual? Let's see) plus unrecoverable March-June 2022. Total if incorrectly start Feb 2023, recoverable = $1.26M. True recoverable = $1.512M. Infringing period from March 2022 to Dec 2025 inclusive: months 2022 March-Dec = 10; 2023 12; 2024 12; 2025 12 = 46 months; units 92,000; royalty $1,656,000. Unrecoverable due to no notice March-June 2022 = 4 months $144,000. Recoverable true = $1,512,000. If incorrectly start Feb 1, 2023: recovers $1,260,000; lost vs true = $252,000; plus still lost March-June $144,000? Total lost from total infringement if using incorrect start = $396,000 (46 months - 35 months = 11 months * 2000*18 = $396,000). The question asks "The value lost from that incorrect start date and the unrecoverable March through June 2022 period." Could be ambiguous: "value lost from that incorrect start date and the unrecoverable March through June 2022 period" = "calculate the value lost from that incorrect start date and [calculate] the unrecoverable March through June 2022 period." It may want value lost from incorrect start date = $252k, and unrecoverable Mar-Jun 2022 = $144k. But maybe "the value lost from that incorrect start date and the unrecoverable March through June 2022 period" = total lost from (incorrect start date + unrecoverable period) = $396k. Let's parse exact bullet: - "The damages amount that would result if February 1, 2023 were incorrectly used as the start date." - "The value lost from that incorrect start date and the unrecoverable March through June 2022 period." Could mean: value lost from that incorrect start date [i.e., the lost amount relative to correct start] AND [value lost for] the unrecoverable March through June 2022 period. It says "and the unrecoverable March through June 2022 period" not "and calculate the value of the unrecoverable...". Might ask two sub-values. We can present all: incorrect-start loss relative to correct = $252,000; unrecoverable no-notice Mar-Jun 2022 = $144,000; total lost relative to all infringement Mar 2022-Dec 2025 under correct law = $396,000; total lost if using incorrect start relative to all infringement = also $396,000? Wait if using incorrect start, lost relative to all infringement: 46-35 = 11 months * $36,000 = $396,000. That equals $252k + $144k. So we can state all to cover ambiguity. But careful: incorrect start date Feb 1, 2023 would omit July 2022-Jan 2023 (7 months) = $252,000, and still omit March-June 2022 (4 months) = $144,000, total lost from all infringement = $396,000. Correct damages = $1,512,000; incorrect = $1,260,000; all infringement potential = $1,656,000. Difference correct vs all = $144k. Difference incorrect vs all = $396k. Difference correct vs incorrect = $252k. Need maybe consider actual notice effect on pre-constructive period? Rule: damages unavailable before substantial compliance unless accused receives actual notice. Actual notice on Feb 1, 2023; no damages for earlier unmarked sales unless actual notice. But actual notice only gives later infringement through expiration? Rule 5: Once constructive or actual notice begins, damages may be recovered for later infringement through expiration. Does actual notice allow recovery for infringement before actual notice but after constructive? Not relevant because constructive earlier. Could actual notice allow recovery for March-June 2022? No, actual notice begins Feb 2023, only later infringement; plus actual notice is after. The rule "damages are unavailable unless accused infringer receives actual notice" could be read that if actual notice occurred, damages may be available even before substantial compliance? But rule 5 says later infringement. It likely means pre-notice no damages. Since actual notice in 2023, cannot recover 2022 pre-notice. Need mention. But is there any retroactive effect of actual notice? No, "later infringement". So March-June 2022 unrecoverable because before constructive notice and before actual notice? Actually actual notice Feb 2023, after. So no. Need check first recoverable date maybe July 1, 2022 or maybe July 15? Because marking records show "Beginning July 1, 2022: 97 percent bore patent number." Substantial compliance begins July 1. DeltaMark sold 2000 units in every calendar month. If each listed month contains 2000 infringing units, for July 2022, all units are in that month. Notice begins at start of month, so recover July 2022. If the first month is July 2022. Good. Need check six-year lookback nuance: filing June 1, 2026. Patent expired Dec 31, 2025. Six years before filing: June 1, 2020. Since no infringement before March 2022, all infringement within six years. If lookback calendar months, first month within six years after filing? Let's compute: Infringement more than 6 years before filing: if filing 6/1/2026, any infringement date < 6/1/2020 is barred. All March 2022 onwards after. So no bar. If using full calendar months, maybe June 2020 month includes dates before June 1? But no infringement. So okay. Need maybe mention patent term: expired Dec 31, 2025. Damages through expiration, not after. So last month Dec 2025. No post-expiration. Need maybe discuss burden of proof? Not necessary but maybe mention stipulated and records. Could mention NovaTag establishes substantial compliance from July 1, 2022; DeltaMark would need to prove earlier unmarked sales after program? Not relevant. Need maybe calculate if Feb 1 2023 used as start date, but actual notice is valid. If incorrectly used, still actual notice? They say "if February 1, 2023 were incorrectly used as the start date." That means ignoring constructive notice and starting at actual notice. Then recoverable months from February 2023. If start date is Feb 1, 2023, first month is February 2023. Need if actual notice received Feb 1, 2023, later infringement in February 2022? No. Later infringement through expiration. February 2023 month includes days after Feb 1. Since units per month, recover entire February month. Count 11 months in 2023 (Feb-Dec), not 12. Yes. Need check if the "first recoverable damages date" could be July 1, 2022 or March 1, 2022? No, because before substantial compliance no damages unless actual notice. Actual notice not until Feb 2023. So first date notice begins = July 1 2022. However rule 1: A patentee that makes or sells a patented article must give constructive notice by marking substantially all patented articles. Before substantial compliance, damages are unavailable unless accused infringer receives actual notice. Here NovaTag's marking 60% Jan-Jun. Not substantial. So no constructive. But DeltaMark actual notice? Not until Feb 1, 2023. But wait: actual notice requires identifying patent, product, charging infringement. The Feb 1 letter qualifies. Does it give damages for later infringement only? Yes. Thus no damages for March-June 2022 or July 2022? Wait July 2022 is after substantial compliance starts July 1, so constructive notice. Thus first recoverable date July 1, 2022. Good. Could there be an issue: constructive notice begins on date substantial compliance begins. The marking records show "Beginning July 1, 2022: 97 percent bore the patent number." Does that mean on July 1 units were marked? Yes. If substantial compliance begins at July 1. So first recoverable date July 1. But DeltaMark sold 2000 units in every calendar month. Could first recoverable calendar month be July 2022, but if units are distributed over the month and notice begins July 1, all units in July are "later" infringement? If a unit sold July 1 maybe after notice. If unit sold before July 1? Not in July. Good. Need maybe include a table with months, units, royalty. Need be careful with dates and inclusive/exclusive. Six-year lookback "more than six years before filing." If filing June 1, 2026, six years before is June 1, 2020. Damages for infringement on June 1, 2020? Not more than six years, but no infringement. If using calendar months, maybe the month of June 2020 partially before June 1? But no. We can state no limitation. Need maybe mention if using actual notice only, first recoverable date would be Feb 1, 2023. But correct first recoverable date earlier due to constructive. Need maybe include formulas: Recoverable months correct: July 2022-Dec 2025 = (2025-2022)*12 + (12-7+1)? Let's compute: 2022 remaining after July inclusive = 12 - 7 + 1 = 6; plus 3*12 = 42. Or months from 7/2022 to 12/2025 inclusive. Units = 42*2,000 = 84,000. Damages = 84,000*18 = $1,512,000. Incorrect: Feb 2023-Dec 2025: 2023 remaining after Feb inclusive = 12-2+1=11; +24 = 35. Units = 70,000. Damages = 1,260,000. Loss vs correct = 7*2,000*18 = 7*36,000 = 252,000. Unrecoverable Mar-Jun 2022: 4 months * 36,000 = 144,000. All infringement from Mar 2022-Dec 2025: 10 months 2022 + 36 = 46; units 92,000; $1,656,000. Correct lost vs all = 144k. Incorrect lost vs all = 396k. If question asks "value lost from that incorrect start date and the unrecoverable March through June 2022 period" total = 252+144=396. Need state clearly. Need maybe mention "value lost from that incorrect start date" could be the difference between correct and incorrect damages ($252k). But if they want lost due to incorrect start and unrecoverable March-June, we can present as: - Lost because of using Feb 1, 2023 instead of July 1, 2022: July 2022-Jan 2023 = 7 months = $252,000. - Unrecoverable no-notice period March-June 2022: 4 months = $144,000. - Combined value not recoverable under correct law compared with all infringement: $144,000; under incorrect start compared with all infringement: $396,000. But wait: "value lost from that incorrect start date and the unrecoverable March through June 2022 period" maybe they want "value lost from that incorrect start date" = damages lost by incorrectly starting Feb 1 2023 (i.e., $252k) "and the unrecoverable March through June 2022 period" = $144k. We can phrase: "If you mean the lost amount attributable solely to the incorrect start date: $252,000. The separate no-notice Mar-Jun 2022 loss is $144,000. Together, the incorrect-start scenario forgoes $396,000 relative to all stipulated infringement (Mar 2022-Dec 2025)." That covers. Need maybe include final answer as bullet answers corresponding to assignment. Could include table. Need ensure no hidden traps: - "Before substantial compliance, damages are unavailable unless the accused infringer receives actual notice." Could this mean that if actual notice occurs later, damages can be recovered for all infringement after actual notice, but also for pre-actual-notice infringement? Usually 35 USC 287: damages for acts prior to actual notice are limited? Let's recall: If patentee fails to mark, damages only for infringement after actual notice. For post-AIA? 287(a): no damages for infringement until patentee gives notice, actual or constructive. Constructive notice by marking. If actual notice, damages can be recovered from date of actual notice? The actual notice provision: "If a patentee... has given notice ... by marking ... the damages ... shall not be recovered unless the infringer... is given actual notice." The actual notice must be given, and damages only after actual notice? Yes. Here rule says later infringement. So no retroactive. - Marking: "substantially all patented articles" and 95% threshold. Jan-Jun 60% no. Beginning July 1, 97% yes. "Compliance remained at 97 percent or higher through expiration." So constructive continuous. Need maybe "first constructive-notice date" = July 1, 2022. If marking at 97% begins July 1, constructive notice begins that date. If units distributed? "distributed patented units" maybe marking on articles before distribution? The records show distributed units. We can accept. - Actual notice: Oct 15 email: "We believe Model K uses technology similar to ours. We are interested in discussing a commercial license." Does not identify patent, does not charge infringement. Insufficient under rule 4. So no actual notice. - Feb 1 letter: identifies patent, Model K, maps claims, states sales infringed; received that day. Satisfies all. Actual notice begins Feb 1, 2023. It does not move first recoverable date earlier than July 1 2022; no impact on start because constructive already. It could serve as backup but not needed. It does not open pre-notice period. - Six-year lookback: filing 6/1/2026; earliest date within lookback 6/1/2020. Infringement starts March 2022; no pre-lookback. It does not shorten later notice-based start date; correct start July 1 2022 remains. Could mention if notice had started before June 1 2020, start would be cut to June 1 2020, but not here. - First recoverable damages date: The earliest date from which damages can be recovered is July 1, 2022 (constructive notice) or, using supplied monthly unit method, first recoverable calendar month July 2022. Need choose. The prompt says "first recoverable damages date" and "Use calendar months for supplied unit and royalty calculation." We can say date = July 1, 2022; in the calendar-month damages window, that means all of July 2022 is recoverable. Good. - Number recoverable calendar months and units through expiration: 42 months, 84,000 units. Need ensure DeltaMark sold from March 2022; yes. So from July 2022-Dec 2025. If first date July 1, maybe July 2022 month is fully recoverable. If one were strict "later infringement" and notice at July 1, units sold July 1 after notice; if monthly aggregation, all July units are later? Yes. - Total royalty: $1,512,000. - Damages if Feb 1, 2023 incorrectly used: $1,260,000. - Value lost from incorrect start date and unrecoverable March-June: We can present detailed: - Lost due to incorrect start (July 2022-Jan 2023): 7 months, 14,000 units, $252,000. - Unrecoverable March-June 2022: 4 months, 8,000 units, $144,000. - If combining the two as total value not recovered in incorrect-start scenario versus all stipulated infringement: 11 months, 22,000 units, $396,000. Wait 7+4=11, units 22,000, $396,000. Yes. But note if comparing incorrect start to correct start, only 7 months $252k. If comparing correct start to all infringement, only 4 months $144k. If comparing incorrect start to all infringement, 11 months $396k. Need maybe also calculate "value lost from that incorrect start date and the unrecoverable March through June 2022 period" maybe they want lost from incorrect start date plus lost for Mar-Jun = $396k. We'll present all. Need maybe mention no interest, enhanced damages, etc. Need maybe use final with headings. Potential issue: The patent issued Jan 1, 2022. Marking Jan-Jun 2022 60%; but if patent issued Jan 1, constructive notice requirement applies after issue. Yes. Potential issue: If substantial compliance begins July 1, 2022, does constructive notice begin on that date or after the date substantial compliance begins? Rule 3: begins on the date substantial compliance begins. Good. Potential issue: "A lower percentage does not." 60% not. Potential issue: "Damages may be recovered for later infringement through patent expiration, subject to the filing lookback." Since DeltaMark sold in March 2022 and constructive notice July 1, 2022, later infringement after notice includes July-Dec 2022 etc. Not March-June. Potential issue: "Each listed month contains 2,000 infringing units" means every calendar month from March 2022 through Dec 2025 contains 2000. For months before infringement? Not listed. Good. Potential issue: "Use calendar months for the supplied unit and royalty calculation." If first recoverable date July 1, 2022, do we count partial month? They likely want July full month because each listed month contains 2000. If actual notice Feb 1 2023, count February full month. Good. Need maybe include table: Period | Months | Units | Royalty Correct recoverable: 7/2022-12/2025 | 42 | 84,000 | 1,512,000 No-notice Mar-Jun 2022 | 4 | 8,000 | 144,000 Incorrect start: 2/2023-12/2025 | 35 | 70,000 | 1,260,000 Lost due to incorrect start: 7/2022-1/2023 | 7 | 14,000 | 252,000 All infringement Mar 2022-Dec 2025 | 46 | 92,000 | 1,656,000 Incorrect vs all lost: 3/2022-1/2023? Wait incorrect start omits March 2022-Jan 2023. Count March-Dec 2022 = 10 months? Let's check: incorrect start Feb 2023, so omitted months March 2022 through January 2023 inclusive. That is 11 months: March, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec 2022, Jan 2023 = 11. Units 22,000; $396,000. This omitted period includes 4 no-notice + 7 recoverable but omitted due to incorrect start. Correct law omits only 4 no-notice. Good. Need ensure if incorrect start date Feb 1, 2023, omitted March 2022-Jan 2023 = 11 months, not just July-Dec? Yes. Need maybe mention "value lost from that incorrect start date" if measured against correct start is July 2022-Jan 2023 = 7 months; if measured against all infringement, includes no-notice too. We'll be explicit. Need maybe include a concise conclusion: NovaTag can recover $1,512,000. The October email is not actual notice. The February letter is actual notice but later than constructive. The correct start is July 1, 2022, not Feb 1, 2023. Need maybe address burdens: NovaTag proves marking 97% from July 1; stipulation covers infringement and royalty. DeltaMark would have burden to prove earlier unmarked sales after compliant program? Actually after patentee establishes compliant program, accused infringer bears burden of proving any earlier unmarked patented sales? Wait rule 7: "The accused infringer bears the burden of proving any earlier unmarked patented sales after the patentee establishes a compliant program." This is a bit odd: earlier unmarked patented sales after the patentee establishes a compliant program? Maybe means after patentee establishes a compliant program, accused infringer must prove unmarked sales before? Not important. We can mention NovaTag's records establish compliance; no contrary facts. Need maybe consider if DeltaMark could prove earlier unmarked patented sales after compliant program? The patentee's own marking records show 97% or higher through expiration. But no issue. We can say stipulated. Need maybe check if "distributed units" vs "sold" and DeltaMark sales? NovaTag sold tracking tag; marking on its units. DeltaMark's infringing units maybe not marked. Marking requirement applies to patented article made or sold by patentee. It gives constructive notice to public. We assume. Good. Need maybe include legal reasoning in final: 1. January-June 2022: 60% <95%; not substantial; no constructive notice. 2. July 1, 2022: 97% >=95%; substantial; constructive notice begins. Continuous through expiration. 3. Oct 15 email: no patent ID, no infringement charge; just license interest and similar tech; not actual notice. 4. Feb 1 letter: identifies patent, product, claims, states infringement; received same day; actual notice. But because constructive notice started July 1, 2022, actual notice does not control start. 5. Six-year lookback: filed June 1, 2026; six-year cutoff June 1, 2020; all stipulated infringement from March 2022-Dec 2025 is within; no reduction. 6. First recoverable date: July 1, 2022; first month July 2022. 7. Months/units/damages: 42, 84k, $1,512,000. 8. If Feb 1, 2023 start: 35 months, 70k, $1,260,000. 9. Value lost: incorrect start loss vs correct = $252,000; no-notice Mar-Jun 2022 = $144,000; combined omitted under incorrect vs all infringement = $396,000. Need maybe note "later infringement" means no recovery for pre-notice March-June 2022 despite actual notice in Feb 2023, because actual notice began after those sales. Good. Need maybe include exact date calculations: - Six-year cutoff: June 1, 2026 minus 6 years = June 1, 2020. If calendar months, any month before June 2020? But none. Maybe if month of June 2020? No infringement. We can say all months March 2022 onward are within. Need maybe include if patent expiration December 31, 2025; last recoverable month December 2025. Need maybe include no post-expiration. Need maybe mention "filing lookback does not shorten a later notice-based start date" - here notice-based start July 1 2022 is later than lookback cutoff, so remains. Need maybe include final answer in a way that directly answers bullets. Let's think if there is any possible alternative answer where first recoverable date is February 1, 2023 because constructive notice only for "later infringement" and perhaps July 1 constructive notice only covers units marked after July 1, but DeltaMark's infringing units in July 2022 may have been manufactured earlier and sold after notice? The rule says damages for later infringement through expiration. If infringement is ongoing sales, after notice. So July sales after notice recoverable. Good. Could there be an issue that marking records show "Beginning July 1, 2022: 97 percent bore the patent number." If only beginning July 1, but substantial compliance requires "substantially all patented articles" made or sold. If a unit was manufactured before July 1 and distributed after? Not relevant. We use monthly distributed units. Could actual notice via Feb 1 letter maybe allow recovery for infringement before actual notice but after constructive? No, constructive already. If no constructive, actual notice would start Feb 2023. But not. Could the six-year lookback with filing June 1, 2026 cut March 2022? No. Let's compute: from March 1, 2022 to June 1, 2026 = 4 years 3 months. If March 31, 2022 to June 1, 2026 = 4 years 2 months. All within 6 years. Need maybe use "calendar months" for lookback: Filing in June 2026; six calendar years before is June 2020. The earliest recoverable month under lookback would be July 2020 if infringement had started then. But since start is March 2022, no issue. Could mention. Need maybe include "total royalty window" = 42 months. Good. Need maybe include "The damages amount that would result if February 1, 2023 were incorrectly used as the start date." If someone incorrectly used actual notice date, they might count from February 2023. We do. But if start date is February 1, 2023, and using calendar months, February 2023 is included. If actual notice received Feb 1, later infringement includes Feb 1 onward; monthly units all February. Good. Need maybe include "value lost from that incorrect start date" maybe $1.512M - $1.26M = $252k. And "unrecoverable March through June 2022 period" maybe $144k. We can say "These are distinct; if combined as the total not recovered under the incorrect-start scenario compared with all stipulated infringement, they sum to $396,000." Good. Need maybe ensure final answer not too terse; desired oververbosity 9. We can provide detailed analysis, table, calculations. Need maybe include "No" for Jan-Jun constructive. "No" for Oct email actual. "Yes" for Feb letter actual. Let's craft final answer with headings: - Short answer / bottom line - Step-by-step analysis 1. Marking and constructive notice 2. Actual notice communications 3. Lookback 4. Correct damages window 5. Hypothetical incorrect start and lost values - Calculation table - Final figures. Need maybe include exact formulas. Let's double-check counts: Correct months: 2022: July 1 to Dec 31. Calendar months: July, Aug, Sep, Oct, Nov, Dec = 6. 2023: 12 2024: 12 2025: 12 Total 42. Units 42*2000=84,000. Royalty per unit $18 => 84,000*10=840k, *8=672k, total 1,512k. Incorrect: 2023 Feb-Dec: Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec = 11. 2024 12, 2025 12 => 35. Units 70,000. Royalty = 1,260k. Difference = 252k. No-notice Mar-Jun 2022: March, April, May, June = 4; units 8,000; $144k. All infringement Mar 2022-Dec 2025: 2022 Mar-Dec = 10; +36=46; units 92k; $1,656k. Correct recoverable $1,512k; lost no-notice $144k. Incorrect $1,260k; lost all $396k. Good. Could there be any issue with "March 2022 through December 2025" includes March 2022, April, May, June = 4 no-notice; July-Dec 2022 = 6 recoverable under correct; but if actual notice Feb 2023, July-Dec 2022 recoverable under constructive. Good. Need maybe mention "the first recoverable damages date" as "July 1, 2022" not "July 2022". But because monthly units, first recoverable month is July 2022. We'll state both. Potential hidden nuance: The patent issued Jan 1, 2022. Marking records Jan 1-Jun 30 2022: 60%. If no constructive notice before substantial compliance, and no actual notice until Feb 2023, damages before Feb 2023 unavailable? But constructive notice starts July 1 2022, so July-Dec 2022 recoverable. Yes. Potential hidden nuance: Rule 7: accused infringer bears burden of proving any earlier unmarked patented sales after the patentee establishes a compliant program. This might relate to pre-compliance? Not needed. Need maybe mention "stipulate every Model K unit in recoverable period infringed and $18/unit proper royalty". So no need to prove infringement. Need maybe mention "ignore interest and enhanced damages" so simple royalty. Need maybe include "No recovery after Dec 31, 2025". Need maybe include "The October 15 email is a licensing invitation/general awareness, insufficient." Need maybe include "The February 1 letter is actual notice but does not permit recovery for March-June 2022 because actual notice only covers later infringement." Good. Let's consider if actual notice could be effective before February 1 due to "general awareness" from October email plus maybe prior? Rule says general awareness insufficient. So no. Potential issue: "identifying the accused product or conduct" Feb letter identifies Model K and maps claims, states sales infringed. Satisfies. Good. Potential issue: "constructive notice begins on date substantial compliance begins and continues while compliance remains at or above 95 percent." If compliance remained at 97% or higher through expiration, no gap. Good. Potential issue: "A lower percentage does not." 60 no. Potential issue: "Before substantial compliance, damages are unavailable unless the accused infringer receives actual notice." Could someone argue that before substantial compliance (Jan-Jun 2022) damages are unavailable unless actual notice, but actual notice Feb 2023 later; if actual notice occurs, does it cure all prior non-marking? Under 287, actual notice only allows damages after actual notice, not before. Rule 5 confirms later. So no. Need maybe mention "the six-year lookback does not shorten a later notice-based start date" - since notice start July 2022 later than lookback cutoff, no shortening. If notice start were before cutoff, earliest would be cutoff; not here. Need maybe produce final answer with exact numbers in currency format. Let's craft final response: "Bottom line: Correct first recoverable date is July 1, 2022; recoverable window July 2022 through December 2025; 42 months; 84,000 units; $1,512,000. The February 2023 actual notice is not the controlling start; using it would understate by $252,000. The pre-notice Mar-Jun 2022 is $144,000 unrecoverable; combined with the incorrect-start omission, total forgone relative to all stipulated infringement is $396,000." Then detailed. Need maybe include table: | Item | Months | Units | Royalty | | Correct: 7/2022-12/2025 | 42 | 84,000 | $1,512,000 | | Incorrect: 2/2023-12/2025 | 35 | 70,000 | $1,260,000 | | Omitted by incorrect start vs correct: 7/2022-1/2023 | 7 | 14,000 | $252,000 | | No-notice: 3/2022-6/2022 | 4 | 8,000 | $144,000 | | All stipulated infringement: 3/2022-12/2025 | 46 | 92,000 | $1,656,000 | | Incorrect vs all: 3/2022-1/2023 | 11 | 22,000 | $396,000 | Check "Omitted by incorrect start vs correct" months: July 2022-Jan 2023 = 7. Good. Need maybe include "All stipulated infringement" not required but useful. Need maybe include "Six-year lookback: filing June 1, 2026; six-year cutoff June 1, 2020; earliest potential month June 2020; no infringement until March 2022; therefore no months lost." Need maybe mention "The first recoverable date is not March 1, 2022 because no notice yet; not October 15 because email insufficient; not February 1 because constructive earlier." Need maybe final in a formal legal memo style? Could be okay. Let's ensure no calculation error: 84,000*18: 80,000*18=1,440,000; 4,000*18=72,000; total 1,512,000. Yes. 70,000*18=1,260,000. Difference 252,000. 14,000*18=252,000. 8,000*18=144,000. 92,000*18: 90k*18=1,620k; 2k*18=36k; total 1,656k. Difference 396k. 22k*18=396k. Need maybe include "calendar months from March 2022 through December 2025 = 46" if mention. Potential nuance: If filing lookback is "no damages for infringement more than six years before filing" and filing June 1, 2026, could the month of June 2020 be partly barred? If there were units in June 2020, units before June 1 maybe barred; but none. Good. Potential nuance: If using calendar months, the six-year lookback might exclude the entire month of June 2020? Some courts use date; but no infringement. We can say using calendar months, the cutoff month is June 2020; all infringement starts March 2022, so no effect. Need maybe include "the patent expired December 31, 2025, so December 2025 is last full recoverable month." Good. Need maybe include "no post-expiration damages." Let's consider if "first recoverable damages date" could be "July 1, 2022" but if DeltaMark sold units in March-June 2022, and NovaTag's marking 60% is insufficient, but could actual notice from February 2023 allow recovery for March-June? Under rule 1, before substantial compliance, damages unavailable unless actual notice. It doesn't explicitly say only later infringement in rule 1, but rule 5 says once constructive or actual notice begins, damages may be recovered for later infringement. This could be read that actual notice begins in Feb 2023, so damages for later infringement; but for pre-substantial compliance period, if actual notice occurs later, can you recover for pre-actual notice infringement? In typical law, no. Rule 5 clarifies later. So no. Could there be a scenario where actual notice letter in Feb 2023 includes "sales infringed" and maybe charges past infringement, so actual notice for past? The rule says "charging infringement" maybe present or ongoing. It says damages may be recovered for later infringement. So no retroactive. Good. Need maybe mention "The February letter's effect is to provide actual notice from February 1, 2023, but because constructive notice already began July 1, 2022, it does not change the damages start." Good. Need maybe mention "The October email would not even qualify as actual notice if it identified patent? It lacked charge and patent. It is insufficient." Need maybe mention "The marking program from July 1 2022 is a compliant program; NovaTag bears burden and records satisfy; no evidence of lower compliance." Good. Need maybe mention "DeltaMark's burden to prove earlier unmarked sales after compliant program does not alter because stipulated and records show 97% or higher." Could include. Need maybe final: "Answer to each requested item:" with bullets. Let's draft final in a clear way. Potential final structure: **1. Marking/constructive notice** - Jan 1-Jun 30, 2022: 60% <95% -> no substantial compliance -> no constructive notice. - July 1, 2022 onward: 97% >=95% -> substantial compliance -> constructive notice begins July 1, 2022 and continues through expiration. **2. Actual notice** - Oct 15, 2022: insufficient (no patent, no product? It mentions Model K but not patent/infringement; license interest). Actually it identifies Model K? It says "Model K uses technology similar to ours" - identifies product, but not patent and not charge. Insufficient. - Feb 1, 2023: sufficient actual notice. Received same day. Effect: actual notice begins; but not controlling because constructive began earlier. **3. Lookback** - Filed 6/1/2026. Six-year cutoff 6/1/2020. All infringing months begin 3/2022; no loss. **4. First recoverable date/window** - First recoverable date: 7/1/2022; using monthly units, first month 7/2022. Window through 12/2025. **5. Calculations** - Months: 6 (2022) + 12 +12 +12 = 42. - Units: 84,000. - Royalty: $1,512,000. **6. Incorrect Feb 1, 2023 start** - Months: Feb-Dec 2023 (11) + 12 +12 = 35. - Units: 70,000. - Damages: $1,260,000. **7. Lost values** - Lost due to using Feb 2023 instead of July 2022: 7 months (July 2022-Jan 2023) = 14,000 units = $252,000. - Unrecoverable no-notice March-June 2022: 4 months = 8,000 units = $144,000. - If combined as total value not recovered in the incorrect-start scenario versus all stipulated infringement March 2022-Dec 2025: 11 months = 22,000 units = $396,000. Correct-law value lost versus all infringement is only $144,000. Need maybe include "Thus NovaTag's correct royalty damages are $1,512,000." Need maybe use "recoverable" not "damages" if no enhanced. Let's think if there is any issue with "first recoverable damages date" being July 1, 2022 but "through patent expiration" December 31, 2025. If the patent expired at end of day Dec 31, 2025, all December units recoverable. Good. Potential issue: The "filing lookback" might mean if filed June 1, 2026, no damages for infringement more than six years before filing, i.e., before June 1, 2020. But if using calendar months, maybe "no damages for the month of June 2020" if any infringement in that month because part of month more than six years? But no infringement. We can avoid nuance. Need maybe include "The lookback does not shorten a later notice-based start date." Since notice start July 2022 is later than June 2020, start remains July 2022. Good. Potential issue: If actual notice began Feb 1, 2023, and constructive began July 1, 2022, but there was a gap? No, compliance continuous. If there were a gap, constructive notice would not continue, but not. Good. Potential issue: "Before substantial compliance, damages are unavailable unless the accused infringer receives actual notice." Could the October email be actual notice because it identifies Model K and says uses technology similar, interested in license? Rule 4 explicitly says licensing invitation or similar technology insufficient. So no. Potential issue: "Identifying the accused product or conduct" - February letter maps two claims. Good. Need maybe include "DeltaMark received it that day, so no delay." Good. Need maybe include "No actual notice before Feb 1, 2023." Good. Need maybe mention "NovaTag's burden of proving marking is met by records; stipulation resolves infringement/royalty." Good. Let's consider if we should cite statute? Not necessary but could mention 35 U.S.C. §287? The prompt gives rules; we can refer to supplied rules. Could mention analogous to §287 but not needed. Maybe avoid external. Need maybe ensure final answer not mention "I" too much. Use objective. Need maybe include final "Answer" with exact values bold. Let's produce final. Ensure high detail but not too long. Use tables. Double-check phrase "The value lost from that incorrect start date and the unrecoverable March through June 2022 period." If they expect a single number maybe $396,000. We can explicitly state: "If that sentence asks for the combined value lost under the incorrect-start scenario as compared with all stipulated infringement, it is $396,000. If it asks for the two components separately, they are $252,000 and $144,000." That might be slightly meta but useful. Maybe phrase elegantly: "The incorrect start date alone costs $252,000; the no-notice Mar-Jun 2022 period costs another $144,000; together they represent $396,000 of all stipulated infringement that would be unrecovered if the case were mis-started on Feb 1, 2023." This avoids ambiguity. Need maybe note "Correctly, NovaTag does not lose the July-Jan 2022/23 value; it is recoverable due to constructive notice." Good. Let's final.