Nitek v. Photon Wave: UV LED Patent Dispute Ends in Joint Dismissal With Prejudice
Nitek, Inc. asserted four UV LED device patents against South Korean manufacturer Photon Wave Co., Ltd. before Judge Rodney Gilstrap in the Eastern District of Texas. After 784 days of litigation, both parties filed a joint motion to dismiss all claims and counterclaims with prejudice, with each side bearing its own costs.
Four UV LED Patents, 784 Days, and a Negotiated Exit Before Trial
Nitek, Inc. filed this patent infringement action on September 15, 2023 in the Eastern District of Texas, Marshall Division, before Judge Rodney Gilstrap — one of the country’s most active patent trial judges. Nitek asserted four US patents covering distinct aspects of group III nitride ultraviolet LED technology: contact configurations for optoelectronic devices (US9042420B2), transparent and higher-conductive semiconductor regions (US8354687B1), thermal management and packaging for UV devices (US10147848B2), and high-power UV light source fabrication (US8680551B1). The defendant, Photon Wave Co., Ltd., is a South Korean developer of UV LED components.
The case closed on November 7, 2025, when the Court granted a joint motion and stipulation of dismissal filed by both parties under Federal Rule of Civil Procedure 41(a)(2). The dismissal was entered with prejudice, meaning neither Nitek nor Photon Wave may refile or reassert the same claims arising from these patents against one another in future litigation. Each party was ordered to bear its own costs, expenses, and attorneys’ fees, a term consistent with a negotiated resolution rather than a contested judgment.
At 784 days, the case ran longer than many E.D. Texas patent matters that settle early, suggesting the parties engaged in meaningful claim construction, discovery, or inter partes review activity before reaching resolution. The joint nature of the dismissal, combined with the mutual cost-bearing provision, is consistent with a confidential settlement — though the public record does not confirm any financial terms, licensing arrangement, or product design-around. What drove Photon Wave to resolve rather than fight to judgment, and whether any license was granted, remains undisclosed.
Filing to Dismissed with Prejudice in 784 days
784 days — above the median timeline for patent cases in E.D. Texas, suggesting substantive pre-trial activity before resolution
Dismissed with prejudice: what the joint stipulation means for both parties
FRCP 41(a)(2) dismissal with prejudice — all claims permanently extinguished
A dismissal with prejudice under Rule 41(a)(2) is a final adjudication on the merits for claim-preclusion purposes. Neither party may refile these specific infringement or counterclaim allegations in any US federal court. The joint nature of the motion signals mutual agreement — neither side was forced to this outcome by an adverse ruling. The Court retains no ongoing jurisdiction over the merits.
Permanent bar on refilingNitek’s patents survive but enforcement against Photon Wave is permanently closed
Dismissal with prejudice forecloses any future infringement action by Nitek against Photon Wave based on the four asserted patents for the conduct at issue. However, the patents themselves remain in force and Nitek retains the right to enforce them against other parties. If a licensing arrangement was reached — which the mutual cost-bearing provision may suggest — the commercial value of the portfolio is preserved without a public adjudication of validity.
Patents intact; this defendant releasedPhoton Wave exits litigation but no invalidity ruling was secured
Photon Wave obtains freedom from further US litigation by Nitek over these patents and these accused products. However, because no court ruled on infringement or validity, the four patents have not been weakened or narrowed through this proceeding. Photon Wave cannot use this outcome as prior art or estoppel to challenge the patents in future disputes — a limitation that may matter if Nitek pursues other UV LED manufacturers.
Released but no validity winUnresolved validity leaves UV LED competitors facing unreduced patent risk
Because the case resolved without claim construction rulings or validity adjudication, the four Nitek UV LED patents emerge from this litigation with their full scope intact. Other group III nitride UV LED manufacturers — particularly those supplying sterilisation, medical, and industrial markets — should treat these patents as active enforcement risks. The confidential resolution also prevents competitors from leveraging any admissions or positions Photon Wave may have taken during the proceedings.
Sector risk unresolvedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Nitek, Inc. | Company | UV LED technology licensor — holder of US9042420B2, US8354687B1, US10147848B2, and US8680551B1Search in Eureka ↗ |
| Defendant | Photon Wave Co., Ltd. | Company | Photon Wave Co., Ltd. — South Korean UV LED component manufacturer and defendantSearch in Eureka ↗ |
| Plaintiff counsel | Andrew Swanson Brown | Attorney | Counsel for Nitek, Inc.Search in Eureka ↗ |
| Plaintiff counsel | David C. Radulescu | Attorney | Counsel for Nitek, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Etai Lahav | Attorney | Counsel for Nitek, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Kevin Sean Kudlac | Attorney | Counsel for Nitek, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Radulescu LLP | Law Firm | Representing Nitek, Inc.Search in Eureka ↗ |
| Defendant counsel | Denise M. DeMory | Attorney | Counsel for Photon Wave Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Eric Robert Carr | Attorney | Counsel for Photon Wave Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Gareth Edward DeWalt | Attorney | Counsel for Photon Wave Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Jennifer Leigh Truelove | Attorney | Counsel for Photon Wave Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Jerry Tice , II | Attorney | Counsel for Photon Wave Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Li Guo | Attorney | Counsel for Photon Wave Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Michael E. Flynn-O’Brien | Attorney | Counsel for Photon Wave Co., Ltd.Search in Eureka ↗ |
| Defendant law firm | Bunsow DeMory LLP | Law Firm | Representing Photon Wave Co., Ltd.Search in Eureka ↗ |
| Defendant law firm | Bunsow DeMory LLP (Redwood) | Law Firm | Representing Photon Wave Co., Ltd.Search in Eureka ↗ |
| Defendant law firm | McKool Smith PC (Marshall) | Law Firm | Representing Photon Wave Co., Ltd.Search in Eureka ↗ |
| Presiding judge | Judge Rodney Gilstrap | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The Court’s order mirrors the parties’ joint stipulation verbatim, granting dismissal with prejudice under FRCP 41(a)(2) across all claims and counterclaims. The equal cost-bearing provision — rather than a fee award to either side — is notable: courts typically enter such terms when both parties have agreed to resolve the dispute on undisclosed commercial terms. No merits findings, claim construction orders, or validity rulings were issued, leaving the four asserted UV LED patents unencumbered by this proceeding.
US9042420B2 and three further UV LED device patents — group III nitride technology
The four asserted patents cover complementary layers of group III nitride ultraviolet LED device design. US9042420B2 (App. No. 14/531162) addresses contact configurations for optoelectronic devices — a foundational aspect of current injection efficiency. US8354687B1 (App. No. 12/512682) covers transparent and higher-conductive regions in the lateral cross-section of semiconductor layers. US10147848B2 (App. No. 15/283462) protects thermal management and packaging approaches for UV devices, and US8680551B1 (App. No. 13/070174) covers high-power UV light source architecture and fabrication. Together, the portfolio spans device design, thermal engineering, and manufacturing.
Group III nitride UV LEDs are the enabling technology for deep-UV sterilisation, water purification, medical phototherapy, and industrial curing applications — markets experiencing rapid commercial growth. A portfolio covering contact design, semiconductor layer architecture, thermal management, and high-power source fabrication represents broad, overlapping coverage that is difficult to circumvent through single-layer design changes. The fact that Nitek assembled and enforced all four patents simultaneously against a Korean UV LED manufacturer suggests a deliberate portfolio licensing strategy targeting commercial-scale UV LED producers entering or expanding in the US market.
Should you run an FTO against US9042420B2 and Nitek’s UV LED portfolio?
Any company designing, manufacturing, or importing group III nitride UV LED devices into the United States — particularly for sterilisation, phototherapy, water treatment, or industrial UV curing — should evaluate freedom-to-operate against Nitek’s four-patent portfolio. This case confirms Nitek’s willingness to litigate in E.D. Texas, a plaintiff-favourable forum, and the absence of any invalidity ruling means all four patents carry their full original claim scope. The risk is not limited to direct competitors of Photon Wave — it extends to any UV LED device that incorporates similar contact, semiconductor layer, thermal, or fabrication architectures.
PatSnap Eureka’s FTO Search Agent allows R&D and IP teams to map their UV LED device architectures against each of the four Nitek patents, identify claim-by-claim overlap, and surface relevant prior art for any IPR strategy. Eureka can also flag related continuation and divisional applications that may extend Nitek’s coverage beyond the four asserted patents. For product teams preparing US market entry or procurement decisions involving UV LED components, an Eureka-powered FTO analysis provides a structured, auditable starting point for counsel review.
Run a freedom-to-operate analysis on US9042420B2 to assess your product’s exposure
Run FTO in Eureka →Similar UV LED and group III nitride patent cases in E.D. Texas
Explore related group III nitride and UV LED patent infringement actions litigated before Judge Gilstrap and other E.D. Texas judges, including comparable multi-patent assertions and dismissal outcomes.
What this case signals for the UV LED and group III nitride IP landscape
Nitek’s four-patent assertion against Photon Wave signals active enforcement in the UV LED space. The resolution without validity adjudication has sector-wide implications.
Nitek’s UV LED portfolio remains intact and actionable post-dismissal
No claim construction ruling, no invalidity finding, and no estoppel limits Nitek’s ability to assert US9042420B2, US8354687B1, US10147848B2, or US8680551B1 against the next target. UV LED manufacturers supplying semiconductor device, sterilisation, or phototherapy markets should treat this portfolio as an active enforcement threat, not a resolved one.
E.D. Texas remains the preferred venue for UV LED patent assertions
Filing before Judge Gilstrap in Marshall signals plaintiff sophistication in venue selection. The 784-day duration before resolution — without a trial — suggests the defendant engaged seriously, but the forum’s plaintiff-friendly reputation likely shaped the litigation dynamic. Companies with UV LED product lines entering the US market should audit their E.D. Texas exposure now.
Nitek v Photon — key questions answered
Nitek, Inc. filed a patent infringement action against Photon Wave Co., Ltd. in the Eastern District of Texas on September 15, 2023, asserting four UV LED patents. The case was dismissed with prejudice on November 7, 2025, pursuant to a joint motion under FRCP 41(a)(2), with each party bearing its own costs. No merits rulings were issued.
Nitek asserted US9042420B2 (contact configuration for optoelectronic devices), US8354687B1 (transparent and conductive regions in semiconductor layers), US10147848B2 (thermal management and packaging for group III nitride UV devices), and US8680551B1 (high power UV light sources and fabrication methods).
Dismissal with prejudice bars Nitek from suing Photon Wave again on these patents for the same conduct. However, the patents themselves remain valid and enforceable. No claim construction or invalidity ruling was issued, so Nitek retains full enforcement rights against other UV LED manufacturers.
The mutual cost-bearing term — rather than a fee award to either side — was agreed by the parties in their joint stipulation and adopted by the Court. This arrangement is consistent with a negotiated resolution, possibly involving undisclosed licensing terms, though the public record does not confirm any financial settlement or license.
The case was assigned to Judge Rodney Gilstrap in the United States District Court for the Eastern District of Texas (Case No. 2:23-cv-00420). Judge Gilstrap is one of the most experienced patent trial judges in the United States, based in the Marshall Division.
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