Vicor v. Cyntec (337-TA-1370): ITC Finds Section 337 Violation After 582 Days
Vicor Corporation prevailed before the US International Trade Commission against Cyntec Co., Ltd., securing a violation finding across three patents covering resonant power converter control, encapsulated modular converter packaging, and series-connected bus architectures. The case closed on 13 February 2025 after 582 days of proceedings — a result that directly threatens Cyntec’s ability to import covered power conversion products into the US market.
Vicor secures ITC violation finding against Cyntec in power electronics dispute
On 12 July 2023, Vicor Corporation filed a Section 337 complaint at the US International Trade Commission against Cyntec Co., Ltd., a Taiwan-based power components manufacturer. Vicor asserted three US patents — US9166481B1, US10199950B1, and US9516761B2 — covering fundamental aspects of high-density power converter design: digital control of resonant converters, encapsulated modular power converter packaging with symmetric heat distribution, and power distribution architectures using series-connected bus converters. Presiding Administrative Law Judge Cameron Elliot oversaw the investigation.
The case closed on 13 February 2025 with a judgment on the merits in Vicor’s favour and a formal finding of a Section 337 violation by Cyntec. At the ITC, a violation finding is typically followed by Presidential review and, if upheld, the issuance of an exclusion order barring importation of the infringing products and/or a cease-and-desist order against domestic respondents. For Cyntec, this outcome creates immediate risk to its US import channel for affected power conversion products.
At 582 days, the investigation ran broadly in line with the ITC’s statutory target of 15–18 months for Section 337 proceedings, suggesting the schedule was not significantly disrupted by procedural complications. The public record does not disclose whether Cyntec has filed or intends to file a petition for Presidential review or a Federal Circuit appeal — both of which remain available post-ITC determination. The breadth of the patent portfolio asserted — spanning control logic, thermal packaging, and system architecture — suggests Vicor pursued a comprehensive enforcement strategy designed to foreclose design-around options.
Filing to Judgment on the merits for Plaintiff in 582 days
582 days from filing to ITC violation finding — typical Section 337 investigations conclude in 15–18 months
ITC violation found: what the merits judgment means for both parties
A Section 337 violation finding: import ban risk, not just liability
Unlike a district court patent judgment, an ITC violation finding does not result in damages. Instead, it triggers a remedial phase in which the Commission may issue an exclusion order preventing US Customs from admitting Cyntec’s infringing products, and/or a cease-and-desist order. The President has 60 days to review the determination; absent disapproval, the remedy takes effect. Cyntec may also appeal to the Federal Circuit.
Import exclusion riskVicor gains leverage to block Cyntec imports and force licensing talks
A merits judgment for Vicor across three patents strengthens its position significantly. An exclusion order, if issued and upheld, would block Cyntec’s power converter products at the US border — one of the most commercially potent remedies in US IP law. This outcome also materially improves Vicor’s negotiating position in any parallel or future licensing discussions with Cyntec or similarly situated competitors.
Strong enforcement postureCyntec faces US import disruption across its power converter product lines
With a violation found on all three asserted patents, Cyntec’s immediate options are limited: seek Presidential review (rarely successful), appeal to the Federal Circuit, or negotiate a licence. In the interim, Cyntec may attempt to redesign affected products to achieve design-around clearance. The three-patent scope — covering control, packaging, and architecture — makes a clean design-around technically challenging and commercially uncertain.
Design-around urgencyPower electronics sector faces heightened ITC enforcement from Vicor’s portfolio
This outcome signals that Vicor is actively deploying its ITC strategy to protect high-density power converter technology — an area of intense competition as AI, data centre, and defence applications demand ever-greater power density. Companies offering resonant converter products, encapsulated power modules, or bus-converter-based distribution architectures should treat this finding as a prompt to reassess FTO exposure against Vicor’s growing patent portfolio.
Portfolio enforcement signalFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Vicor Corporation | Company | Power electronics IP licensor and converter manufacturer — holder of US9166481, US10199950, US9516761Search in Eureka ↗ |
| Defendant | Cyntec Co., Ltd. | Company | Taiwan-based passive components and power module manufacturer; respondent in ITC Section 337 investigationSearch in Eureka ↗ |
| Plaintiff counsel | Louis S. Mastriani. | Attorney | Counsel for Vicor CorporationSearch in Eureka ↗ |
| Plaintiff law firm | Polsinelli PC | Law Firm | Representing Vicor CorporationSearch in Eureka ↗ |
| Defendant counsel | Paul F. Brinkman | Attorney | Counsel for Cyntec Co., Ltd.Search in Eureka ↗ |
| Defendant law firm | Kirkland & Ellis LLP | Law Firm | Representing Cyntec Co., Ltd.Search in Eureka ↗ |
| Presiding judge | Judge Cameron Elliot | Judge | United States International Trade CommissionSearch in Eureka ↗ |
Official order — verbatim text
The ITC’s violation finding against Cyntec on all three asserted patents represents a full merits adjudication in Vicor’s favour — not a default or procedural outcome. At the ITC, ‘violation found’ means the ALJ determined that the respondent’s products infringe valid claims of the asserted patents and that a domestic industry exists. This triggers the Commission’s remedial phase, in which the scope of any exclusion order — general or limited — and whether a cease-and-desist order issues will be determined. Cyntec retains the right to seek Presidential review and Federal Circuit appeal.
US9166481, US10199950 & US9516761 — power converter control, packaging and architecture
The three patents at issue span complementary layers of advanced power conversion technology. US9166481B1 (App. 13/830262) covers digital control techniques for resonant power converters — a class of switching converter that achieves high efficiency through zero-voltage or zero-current switching. US10199950B1 (App. 13/933252) addresses the physical implementation of modular power converters, specifically encapsulated packaging designs that distribute heat symmetrically — critical for high-density deployments. US9516761B2 (App. 14/635467) covers system-level power distribution architectures using series-connected bus converters, a topology increasingly used in 48V and data centre power delivery systems.
Taken together, these three patents reflect Vicor’s strategic intent to IP-protect an entire power conversion stack — from the control algorithm through the physical package to the system architecture. For competitors offering similar high-density power modules, this portfolio creates layered FTO risk that cannot be resolved by addressing any single patent. The resonant converter and bus converter spaces are particularly active given demand from AI infrastructure, telecommunications, and defence electronics — sectors where Vicor has historically been a leading supplier.
Should your team run an FTO against US9166481, US10199950 and US9516761?
Any organisation designing, manufacturing, or importing resonant power converters, encapsulated power modules, or series-connected bus converter systems for the US market should treat this ITC outcome as a direct FTO trigger. The three asserted patents span control, packaging, and architecture — meaning product teams cannot rely on a single design element change to achieve clearance. Power module manufacturers, ODMs supplying data centre platforms, and 48V power architecture designers are particularly exposed.
PatSnap Eureka’s FTO Search Agent can map your product’s technical features against the independent claims of US9166481, US10199950, and US9516761, identify relevant prior art for potential IPR challenges, and flag continuation and divisional applications in Vicor’s power electronics family that may present additional future risk. With an ITC exclusion order potentially in effect, running this analysis now — before product launch or US market entry — is strongly preferable to a reactive position.
Run a freedom-to-operate analysis on US9166481B1 to assess your product’s exposure
Run FTO in Eureka →Similar ITC Section 337 cases involving power electronics and converter patents
Browse related Section 337 investigations at the ITC involving resonant power converters, modular power packaging, and power distribution architecture patents.
What this case signals for the power electronics IP landscape
Vicor’s ITC win against Cyntec reframes competitive risk for every resonant power converter and modular power module supplier targeting the US market.
ITC is Vicor’s weapon of choice — and it works
Choosing the ITC over district court gives Vicor access to import exclusion — a remedy that hits hardware-centric competitors like Cyntec directly in the supply chain. The 582-day timeline and clean merits win validate this forum selection strategy. Competitors shipping power converter products into the US should assume Vicor will use this precedent as a template for future enforcement actions.
Three-patent assertion strategy forecloses easy design-around paths
By asserting patents covering control logic (US9166481), thermal packaging (US9516761), and system architecture (US10199950) simultaneously, Vicor created overlapping IP coverage that makes a single design-around insufficient. Any competitor developing resonant converters, encapsulated power modules, or series bus architectures must clear all three independent claim families — a materially higher FTO burden than a single-patent case.
Vicor v Cyntec — key questions answered
The ITC found a Section 337 violation by Cyntec Co., Ltd., entering judgment on the merits in favour of Vicor Corporation. The finding covered three patents: US9166481B1, US10199950B1, and US9516761B2. The case closed on 13 February 2025 after 582 days. Remedial proceedings, including potential exclusion and cease-and-desist orders, follow the violation finding.
Vicor asserted three US patents: US9166481B1 covering digital control of resonant power converters, US10199950B1 covering encapsulated modular power converters with symmetric heat distribution, and US9516761B2 covering power distribution architecture with series-connected bus converters. The combination reflects a multi-layer enforcement strategy spanning control, packaging, and system architecture.
A violation finding triggers the ITC’s remedial phase. The Commission may issue a general exclusion order or limited exclusion order barring US Customs from admitting Cyntec’s infringing products, and/or a cease-and-desist order. The President has 60 days to review the determination. Cyntec may also appeal to the US Court of Appeals for the Federal Circuit. Until any remedy is stayed or overturned, Cyntec faces significant disruption to its US import channel.
Yes. Cyntec may seek Presidential review within the statutory 60-day window and separately appeal the ITC’s final determination to the US Court of Appeals for the Federal Circuit. A Federal Circuit appeal could result in affirmance, reversal, or remand on individual patent claims. During appeal, Cyntec may seek a stay of any exclusion order, though stays are not automatically granted.
The investigation focused on products implementing digital control of resonant power converters, encapsulated modular power converters with symmetric heat distribution, and power distribution architectures using series-connected bus converters. These product categories are broadly relevant to high-density power delivery systems used in data centres, AI infrastructure, telecommunications, and defence electronics.
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