AMS Sensors v. Renesas Electronics: $51.77M Judgment After 16-Year Trade Secret Battle
AMS Sensors USA (formerly Texas Advanced Optoelectronic Solutions) secured a $51,770,243 agreed final judgment against Renesas Electronics America over misappropriation of TAOS ambient light sensor trade secrets and breach of contract. The case, filed in November 2008, ran for over 6,000 days before reaching resolution in May 2025 — one of the longest-running trade secret disputes in the Eastern District of Texas.
A 16-Year Trade Secret War Over Ambient Light Sensor IP Ends in Eight-Figure Judgment
Filed in November 2008 in the Eastern District of Texas, AMS Sensors USA Inc. — then operating as Texas Advanced Optoelectronic Solutions (TAOS) — brought infringement, trade secret, and contract claims against what was then Intersil Corporation, now Renesas Electronics America Inc. The dispute centred on TAOS ambient light sensor technology protected by US6596981B1 and a constellation of trade secrets, with Renesas’s ISL29003 product and a range of derivative products alleged to embody misappropriated know-how and breach confidentiality obligations.
The case resolved in May 2025 through an agreed final judgment — meaning both parties consented to the award rather than proceeding to a jury verdict or bench decision on disputed facts. The court ordered Renesas to pay $51,770,243 in total, broken into disgorgement damages of $8,546,000 for ISL29003-related trade secret misappropriation, $17,092,000 in exemplary damages reflecting fraud, malice, or gross negligence, reasonable royalties totalling approximately $7.25M for breach of contract across primary and derivative products, pre- and post-judgment interest exceeding $14.5M combined, attorneys’ fees of $3,908,812, and $390,736 in costs.
The 6,029-day duration — nearly 16.5 years — is exceptional even by Eastern District standards and likely reflects multiple rounds of claim construction, inter partes proceedings, corporate rebranding on both sides, and protracted damages discovery. The agreed final judgment structure suggests the parties negotiated precise figures rather than submitting to jury determination, though the public record does not disclose the commercial terms that may have accompanied the settlement of any remaining disputed issues. The court retains jurisdiction to enforce the judgment until a joint notice of satisfaction is filed.
Filing to Judgment on the merits for Plaintiff in 6029 days
6,029 days litigated — well above the Eastern District of Texas median for patent and trade secret cases
Agreed final judgment: what the $51.77M award means for both parties
Agreed final judgment — consent without full trial adjudication
An agreed final judgment means Renesas accepted the specific dollar figures rather than contesting them at trial. The court’s order is nonetheless a final judgment on the merits, binding and enforceable. The ‘agreed’ designation does not reduce enforceability — Renesas is bound to pay and the court retains jurisdiction. Critically, exemplary damages were included, which typically requires a finding of fraud, malice, or gross negligence, suggesting the agreed amounts reflect acknowledged wrongdoing.
Judgment on the meritsFull spectrum recovery: disgorgement, royalties, and exemplary damages
AMS Sensors secured every major category of damages available in trade secret and breach-of-contract claims: disgorgement tied to Renesas’s actual profits on the ISL29003, 2× exemplary damages on the disgorgement award, reasonable royalties on both primary and derivative product lines, pre- and post-judgment interest, and full attorneys’ fees. A recovery of this breadth — across tort, contract, and fee-shifting — is consistent with a case where the defendant’s conduct was difficult to defend at trial.
Multi-category plaintiff recoveryRenesas faces $51.77M liability across ISL29003 and derivative product lines
Renesas Electronics America (formerly Intersil) is required to pay $51,770,243 encompassing all categories in the judgment. The inclusion of $17.09M in exemplary damages — twice the base disgorgement figure — signals that the underlying conduct was characterised as willful or egregious. Renesas’s exposure across both the ISL29003 and downstream derivative products indicates the scope of misappropriation extended beyond a single device. The court retains jurisdiction until full satisfaction is confirmed.
Full liability, all product linesExemplary damages and fee awards raise stakes for sensor IP disputes
This outcome signals that Eastern District courts will sustain substantial exemplary damage awards in trade secret cases where egregious conduct is established or agreed. The attorneys’ fee award of $3.9M — on top of $47.8M in substantive damages — underscores the cost of protracted defence. Sensor and semiconductor companies handling third-party confidential technical information face materially higher downside risk when conduct can be characterised as wilful misappropriation rather than mere infringement.
High exemplary damages riskFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | AMS Sensors USA, Inc. | Company | Ambient light sensor IP licensor — holder of US6596981B1 and TAOS trade secretsSearch in Eureka ↗ |
| Defendant | Renesas Electronics Corporation | Company | Renesas Electronics America Inc. (f/k/a Intersil Corporation) — semiconductor manufacturerSearch in Eureka ↗ |
| Plaintiff counsel | Chase A. Cobern | Attorney | Counsel for AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Gabriela Isuani Monahan | Attorney | Counsel for AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Jamil N. Alibhai | Attorney | Counsel for AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Jordan Christine Strauss | Attorney | Counsel for AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Kelly P. Chen | Attorney | Counsel for AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Michael Andrew McCabe | Attorney | Counsel for AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Michael Craig Wilson | Attorney | Counsel for AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Robert Darren McCutcheon | Attorney | Counsel for AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Ryan Hudson | Attorney | Counsel for AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Battiste Clement PLLC | Law Firm | Representing AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Munck Wilson Mandala LLP (Dallas) | Law Firm | Representing AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Munsch, Hardt, Kopf & Harr PC (Dallas) | Law Firm | Representing AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Sharp Law, LLP | Law Firm | Representing AMS Sensors USA, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Toyota Motor North America, Inc. | Law Firm | Representing AMS Sensors USA, Inc.Search in Eureka ↗ |
| Defendant counsel | Anna Rebecca Skupin | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Ashley Michelle Koley | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Brian R Matsui | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Chris Scott Graham | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Clyde Moody Siebman | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Daniel Fletcher Olejko | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Daniel P. Muino | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Gregory A Castanias | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Gregory L. Lippetz | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Henry Leon (Lon) Outland , III | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | James Robert Perkins | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Jeffrey Ray Bragalone | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Jill F Kopeikin | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Justin Bryce Kimble | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Justin Mark Sobaje | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Kathleen Danielle Lynott | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Michael Charles Smith | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Michael Wayne Shore | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Patrick Joseph Conroy | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Pavan K. Agarwal | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Rajkumar Vinnakota | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Richard J Johnson | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Richard Spencer Montei | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Scott Bradley Poteet | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Seth W Lloyd | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Stuart Douglas Dwork | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | Thomas William Kennedy , Jr. | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant counsel | William J. Robinson | Attorney | Counsel for Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | AT&T Services, Inc.(Dallas) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Bragalone Olejko Saad PC | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Cole Schotz PC (Dallas) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Collin County Criminal District Attorney’s Office | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Dechert LLP – Mountain View CA | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Foley & Lardner LLP (Los Angeles) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Foley & Lardner – Washington | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Foley & Lardner LLP (Chicago) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Jones Day (Dallas) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Jones Day (Palo Alto) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Jones Day (Reavis & Pogue) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Morrison & Foerster, LLP (Washington) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Nelson Bumgardner Conroy PC | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Nelson Bumgardner Conroy PC (Dallas) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Scheef & Stone LLP (Marshall) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Shore Chan DePumpo LLP | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | Siebman Forrest Burg & Smith LLP (Sherman) | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Defendant law firm | The Shore Firm | Law Firm | Representing Renesas Electronics CorporationSearch in Eureka ↗ |
| Presiding judge | Judge Amos L Mazzant | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The agreed final judgment is notable for its itemised structure: each damages category — disgorgement, exemplary, contract royalties, interest, fees, and costs — is individually quantified and ordered. This level of specificity is consistent with a negotiated resolution in which both parties agreed on line-item figures, likely following damages expert reports and pre-trial briefing. The explicit finding of ‘fraud, malice, or gross negligence’ embedded in the exemplary damages order, even within an agreed judgment, creates a reputational and precedential record that Renesas cannot later dispute. Post-judgment interest of $1,591,558 already accrued at the time of entry signals a protracted period between liability determination and final payment.
US6596981B1 — TAOS Ambient Light Sensor Technology
US6596981B1, filed under application number US10/047484, protects ambient light sensor technology developed by Texas Advanced Optoelectronic Solutions (TAOS). Ambient light sensors detect and measure environmental light intensity, enabling automatic display brightness adjustment and energy management in consumer electronics, automotive systems, and industrial devices. The patent represents core sensing architecture rather than a peripheral feature, making it strategically central to any product line relying on photodetector-based light measurement.
For the semiconductor sector, a patent covering core ambient light sensing circuitry creates meaningful blocking potential across consumer electronics OEMs, automotive display suppliers, and smart-building device makers. Renesas’s ISL29003 was a commercially significant ambient light sensor product, and the litigation outcome confirms that third parties licensing or acquiring foundational sensor designs must conduct rigorous provenance analysis. As ambient light sensing is embedded in an expanding range of IoT and automotive platforms, this patent’s enforceability — affirmed through an eight-figure judgment — elevates its strategic value for licensing, assertion, and defensive acquisition.
Should your product team run an FTO against US6596981B1?
Any organisation designing, manufacturing, or sourcing ambient light sensor ICs — including display brightness management modules, photodetector arrays, or environmental sensing subsystems — should treat US6596981B1 as a live enforcement risk. The TAOS judgment confirms the patent holder’s willingness and capacity to litigate to full judgment over a 16-year period, and the corporate succession from TAOS to AMS Sensors to ams-OSRAM demonstrates active portfolio management through acquisitions. Automotive, consumer electronics, and IoT device teams working with third-party light sensor IP should specifically assess provenance and licensing chain integrity.
PatSnap Eureka’s FTO Search Agent can map the claim scope of US6596981B1 against your product architecture, surface design-around prior art, and flag related family members or continuation applications that may extend coverage. Eureka also tracks the litigation and licensing history of the ams-OSRAM portfolio, enabling your IP team to assess whether a freedom-to-operate opinion is required before commercial launch — and to model royalty exposure scenarios benchmarked against the damages awarded in this case.
Run a freedom-to-operate analysis on US6596981B1 to assess your product’s exposure
Run FTO in Eureka →Similar ambient light sensor and semiconductor trade secret cases
Related trade secret and sensor IP disputes litigated in the Eastern District of Texas and comparable semiconductor enforcement actions before U.S. district courts.
What this case signals for the ambient light sensor and semiconductor IP landscape
A $51.77M trade secret judgment spanning 16 years reshapes the calculus for sensor IP enforcement and semiconductor M&A diligence.
Exemplary damages in trade secret cases can double base recovery
The $17.09M exemplary award — exactly 2× the base disgorgement — illustrates that willful or fraudulent misappropriation of sensor trade secrets can result in multiplied exposure beyond royalty models. Companies evaluating sensor IP risk should model exemplary exposure, not just reasonable royalty benchmarks.
Agreed final judgments still carry full enforcement weight
Despite the ‘agreed’ framing, this judgment is fully enforceable, with court-retained jurisdiction until satisfaction. Patent and trade secret defendants should understand that negotiating an agreed figure does not avoid public precedent — the award, its components, and the characterisation of conduct remain on the public record.
AMS v Renesas — key questions answered
The court ordered Renesas Electronics America to pay $51,770,243 in total. This comprised $8,546,000 in disgorgement damages for ISL29003 trade secret misappropriation, $17,092,000 in exemplary damages, approximately $7.25M in reasonable royalty damages for breach of contract across primary and derivative products, over $14.5M in combined pre- and post-judgment interest, $3,908,812 in attorneys’ fees, and $390,736 in costs.
The case centred on ambient light sensor trade secrets developed by Texas Advanced Optoelectronic Solutions (TAOS), the predecessor to AMS Sensors USA. The specific trade secrets related to sensor technology incorporated into TAOS light sensor products. Renesas’s ISL29003 ambient light sensor was identified as the primary product incorporating misappropriated trade secrets, with additional derivative products also subject to breach-of-contract royalty claims.
The case was filed in November 2008 and closed in May 2025 — a span of 6,029 days. The exceptional duration is consistent with complex IP disputes involving multiple claim types (patent, trade secret, and contract), corporate rebranding on both sides, potential inter partes review proceedings, and protracted damages expert discovery. The public record does not fully disclose all procedural milestones, so the precise drivers of delay cannot be confirmed from available docket data alone.
The $17,092,000 exemplary award — equal to 2× the base disgorgement amount — required a finding or agreement that Renesas’s misappropriation involved fraud, malice, or gross negligence under applicable trade secret law. Even within an agreed final judgment, this characterisation creates a documented public record of egregious conduct. For the semiconductor sector, it signals that courts and parties in the Eastern District of Texas are willing to embed willfulness findings into consent judgments, raising the stakes for defendants in similar disputes.
The patent involved is US6596981B1, filed under application number US10/047484, which covers TAOS ambient light sensor technology. The case also involved substantial trade secret and breach-of-contract claims that ultimately drove the majority of the damages awarded, with the combined reasonable royalty and disgorgement amounts reflecting both the patent and non-patent dimensions of Renesas’s alleged wrongdoing.
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