Delta Electronics v. Vicor Corp: Power Converter Patent Suit Dismissed With Prejudice
Delta Electronics filed suit against Vicor Corporation in the Western District of Texas, asserting US9819263B2 against Vicor’s NBM2317S60D1580T0R power converter. The parties jointly stipulated to dismiss all claims with prejudice after 562 days of litigation, with each side bearing its own costs.
Power converter IP clash ends in bilateral dismissal with finality
On 23 October 2023, Delta Electronics, Inc. filed a patent infringement action against Vicor Corporation in the Western District of Texas (Case No. 6:23-cv-00726), presided over by Judge Kathleen Cardone. Delta asserted US9819263B2 — a power conversion circuit patent — against Vicor’s NBM2317S60D1580T0R power converter module, a high-density bus converter used in data centre and advanced computing power delivery architectures.
After 562 days of litigation, the parties filed a Joint Stipulation of Dismissal. On 7 May 2025, the Court entered an order under Rule 41(a) of the Federal Rules of Civil Procedure dismissing all claims with prejudice. Critically, the Court further ordered that each party shall bear its own costs and fees — a mutual walk-away structure that suggests the resolution was negotiated rather than adjudicated. Dismissal with prejudice extinguishes Delta’s ability to re-assert the same claims against Vicor based on the same patent.
At 562 days, the case ran longer than many W.D. Texas patent actions that resolve pre-trial, suggesting substantive claim construction or discovery activity occurred before the parties reached terms. The own-costs provision is consistent with a confidential settlement, though the public record is silent on any financial terms, licence grant, or product design-around. What drove the resolution — whether a licensing agreement, a cross-licence, or a commercial decision to avoid trial risk — remains undisclosed.
Filing to Dismissed with Prejudice in 562 days
562 days — above the median for W.D. Texas patent cases that settle pre-trial
Dismissed with prejudice: what the joint stipulation means for both parties
Rule 41(a) dismissal with prejudice — claims permanently extinguished
A dismissal with prejudice under Rule 41(a) of the Federal Rules of Civil Procedure is a final adjudication on the merits for res judicata purposes. Delta Electronics cannot re-file the same infringement claims against Vicor based on US9819263B2 in any court. The joint stipulation format means both parties agreed to the terms, distinguishing this from a unilateral voluntary dismissal.
Permanent bar on re-filingDelta gives up its right to pursue Vicor on this patent
By agreeing to dismissal with prejudice, Delta Electronics permanently relinquishes its right to assert US9819263B2 against Vicor for the accused NBM2317S60D1580T0R product and, arguably, related Vicor products under the same patent. If a confidential licence or settlement was reached, it likely forms the commercial rationale — but no such terms are visible in the public record. Delta retains the patent and may still assert it against other parties.
Vicor claims fully resolvedVicor secures finality — but on undisclosed terms
Vicor Corporation achieves complete closure of the Western District of Texas litigation. The with-prejudice dismissal eliminates future exposure from Delta on this patent for the accused converter line. The own-costs order means Vicor incurred no adverse cost award. Whether Vicor obtained a licence, agreed to a design-around, or simply negotiated a walk-away is not disclosed in the public docket.
No adverse cost awardPower converter IP remains live — Delta can target other infringers
US9819263B2 survives this litigation fully intact. Delta Electronics retains all enforcement rights against third parties in the power conversion market. Competitors shipping similar high-density bus converters — particularly those targeting data centre power delivery — should treat this outcome as a signal that Delta is willing to litigate this patent aggressively. The Vicor resolution does not diminish the patent’s validity or claim scope.
Patent remains enforceableFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Delta Electronics, Inc. | Company | Power electronics manufacturer — holder of US9819263B2 (power conversion circuits)Search in Eureka ↗ |
| Defendant | Vicor Corporation | Company | Vicor Corporation — designer of high-density power converter modules for data centre and computing applicationsSearch in Eureka ↗ |
| Plaintiff counsel | John D. Esterhay | Attorney | Counsel for Delta Electronics, Inc.Search in Eureka ↗ |
| Plaintiff counsel | John P. Schnurer | Attorney | Counsel for Delta Electronics, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Kyle R. Canavera | Attorney | Counsel for Delta Electronics, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Miguel J. Bombach | Attorney | Counsel for Delta Electronics, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Yun Lu | Attorney | Counsel for Delta Electronics, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Foley & Lardner LLP | Law Firm | Representing Delta Electronics, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Perkins Coie LLP | Law Firm | Representing Delta Electronics, Inc.Search in Eureka ↗ |
| Defendant counsel | David M. Hoffman | Attorney | Counsel for Vicor CorporationSearch in Eureka ↗ |
| Defendant counsel | Frank E. Scherkenbach | Attorney | Counsel for Vicor CorporationSearch in Eureka ↗ |
| Defendant counsel | Lawrence K. Kolodney | Attorney | Counsel for Vicor CorporationSearch in Eureka ↗ |
| Defendant counsel | Steven R. Katz | Attorney | Counsel for Vicor CorporationSearch in Eureka ↗ |
| Defendant counsel | Warren K. Mabey , Jr | Attorney | Counsel for Vicor CorporationSearch in Eureka ↗ |
| Defendant law firm | Fish & Richardson – Steve Katz | Law Firm | Representing Vicor CorporationSearch in Eureka ↗ |
| Defendant law firm | Fish & Richardson PC | Law Firm | Representing Vicor CorporationSearch in Eureka ↗ |
| Presiding judge | Judge Kathleen Cardone | Judge | Texas Western District CourtSearch in Eureka ↗ |
Official order — verbatim text
The Court’s order adopts the parties’ joint stipulation verbatim, dismissing all claims with prejudice under Rule 41(a) and directing each party to bear its own costs. The with-prejudice designation carries substantive legal weight — it operates as a final judgment on the merits for res judicata purposes, permanently barring Delta from re-litigating the same infringement claims against Vicor. The own-costs provision reflects a negotiated outcome: courts rarely impose own-costs orders in contested matters; here it suggests both parties bargained for cost neutrality as part of their resolution. No merits findings, no claim construction rulings, and no validity determinations were issued.
US9819263B2 — Power conversion circuit for high-density DC-DC converters
US9819263B2 (application number US15/286542) covers power conversion circuit architecture relevant to high-density DC-DC converters. The patent addresses power delivery innovations applicable to bus converters and related power electronics used in data centre, telecom, and advanced computing infrastructure. Its grant reflects a specific technical contribution to power conversion efficiency or topology that Delta Electronics has chosen to actively enforce against competitor products.
In the context of rapidly expanding AI and hyperscale data centre power demands, patents covering efficient DC-DC conversion architectures carry significant commercial weight. Vicor’s NBM (Numerically Balanced Multiplier) converter family is a premium, high-density product line targeting exactly these applications. Delta’s decision to assert US9819263B2 specifically against the NBM2317S60D1580T0R suggests it identified meaningful claim overlap with Vicor’s core power delivery technology — making this patent a credible competitive instrument in the sector.
Should your team run an FTO analysis against US9819263B2?
Any company designing, importing, or selling high-density DC-DC bus converters — particularly NBM-class or equivalent architectures for data centre power rails — should conduct a freedom-to-operate assessment against US9819263B2. Delta’s demonstrated willingness to assert this patent through 562 days of W.D. Texas litigation signals a credible enforcement posture. The patent’s claim scope was never construed by the court, leaving competitive products in a zone of uncertainty.
PatSnap Eureka’s FTO Search Agent can map the claim language of US9819263B2 against your product specifications, identify prior art that may limit claim scope, and surface continuation or divisional applications in Delta’s portfolio that could extend the risk horizon. Early FTO analysis is substantially cheaper than W.D. Texas litigation defence — Fish & Richardson’s involvement on Vicor’s side indicates the level of IP firepower this dispute attracted.
Run a freedom-to-operate analysis on US9819263B2 to assess your product’s exposure
Run FTO in Eureka →Similar power electronics patent cases in W.D. Texas and related courts
Explore comparable DC-DC power conversion patent infringement actions filed in the Western District of Texas involving power electronics manufacturers.
What this case signals for the power electronics IP landscape
Delta’s willingness to litigate in W.D. Texas for nearly 18 months before settling underscores the commercial stakes around power converter IP.
W.D. Texas remains a credible venue for power electronics patent enforcement
Delta Electronics chose the Western District of Texas — a plaintiff-favoured venue — to assert a single power conversion patent against a specific Vicor product line. The case ran 562 days before resolution, confirming the court’s willingness to carry high-tech patent disputes through substantive stages. Power electronics companies should model W.D. Texas as a realistic enforcement destination.
Own-costs provisions signal bilateral negotiation, not plaintiff capitulation
A mutual own-costs order in a dismissed-with-prejudice case typically signals a negotiated resolution rather than a defendant victory. Neither party received a cost award, suggesting the settlement — if any — was commercially balanced. IP counsel should not interpret this dismissal as a weakness in US9819263B2’s claim scope or enforceability.
Delta v Vicor — key questions answered
The case was dismissed with prejudice on 7 May 2025 pursuant to a joint stipulation filed by both parties under Rule 41(a) of the Federal Rules of Civil Procedure. Each party was ordered to bear its own costs and fees. The dismissal with prejudice permanently bars Delta from re-asserting the same claims against Vicor.
Delta Electronics asserted US9819263B2 (application number US15/286542), a patent covering power conversion circuit technology. The accused product was Vicor’s NBM2317S60D1580T0R power converter module, a high-density bus converter used in data centre and advanced computing power delivery applications.
No. The dismissal with prejudice resolves only Delta’s claims against Vicor in this specific action. US9819263B2 remains a granted, enforceable patent. Delta retains full rights to assert it against other parties in separate proceedings. No court issued any ruling on the patent’s validity or claim scope in this case.
An own-costs order — where each party pays its own litigation expenses — is consistent with a negotiated resolution rather than a clear win for either side. It suggests both parties agreed to cost neutrality as part of whatever terms ended the dispute. The public record does not disclose whether a licence, cross-licence, or other commercial agreement was reached.
The case ran for 562 days, from 23 October 2023 to 7 May 2025. This duration suggests substantive litigation activity — potentially including claim construction briefing and discovery — occurred before the parties reached resolution. Cases that settle at the outset typically close within 180–270 days in W.D. Texas, making the 562-day duration noteworthy.
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