Senko Advanced Components v. US Conec: 7-Patent MDC/MMC Connector Dispute Settles
Senko Advanced Components filed suit against US Conec in the Delaware District Court, asserting seven patents covering MDC and MMC fiber optic connectors and adapters. The parties reached a settlement after 616 days, dismissing all claims and counterclaims with prejudice — each side absorbing its own legal costs.
Seven-patent MDC/MMC connector battle ends in confidential settlement
On January 24, 2023, Senko Advanced Components, Inc. filed an infringement action against US Conec, Ltd. in the Delaware District Court (Case No. 1:23-cv-00083), asserting seven US patents — US11181701B2, US11415760B2, US11307369B2, US11333836B2, US10191230B2, US11061190B2, and US11340413B2 — all directed at MDC and MMC fiber optic connector and adapter technology. The accused products encompassed a broad range of US Conec’s MDC and MMC portfolio, including UPC and APC connectors, multi-port adapters, and aligned-key and junior-form-factor variants.
The case closed on October 1, 2024, via a stipulated dismissal under Federal Rule of Civil Procedure 41(a)(1)(A)(ii), entered pursuant to a private settlement agreement. All claims by Senko and all counterclaims by US Conec were dismissed with prejudice, meaning neither party may relitigate the same claims in federal court. The mutual cost-bearing provision suggests neither side extracted a clear fee-shifting concession, which is consistent with a negotiated resolution rather than a decisive win for either party.
The 616-day lifespan, combined with the breadth of seven asserted patents and nine accused product families, suggests the parties engaged in substantive discovery and claim-construction proceedings before reaching terms. The confidential settlement agreement means the precise commercial resolution — including any licensing royalties, design-around commitments, or cross-licences — remains unknown from the public record. What is clear is that Senko opted to protect its MDC/MMC patent portfolio aggressively, and US Conec’s decision to settle rather than litigate to judgment may reflect portfolio or product-line considerations not visible in the docket.
Filing to Case Settled in 616 days
616 days — above the median for multi-patent infringement cases in Delaware District Court
Dismissed with prejudice by stipulation: what the settlement means for both parties
Rule 41(a)(1)(A)(ii) dismissal with prejudice explained
A stipulated dismissal under Rule 41(a)(1)(A)(ii) requires both parties’ signatures and terminates the action permanently. ‘With prejudice’ means Senko cannot re-file the same infringement claims against US Conec on these seven patents for the same accused products. The dismissal is entered pursuant to the parties’ private settlement agreement, the terms of which are not part of the public court record.
Permanent bar on re-filingSenko’s patents survive — enforceability intact against third parties
A with-prejudice settlement does not invalidate Senko’s seven asserted patents. The patents remain in force and enforceable against other parties in the market. Senko’s willingness to assert a portfolio of seven patents across nine product families signals an active enforcement posture in the MDC/MMC connector space. Any licensing value extracted in the confidential agreement would represent a commercial return without a validity ruling that could weaken the portfolio.
Patents remain enforceableUS Conec avoids a merits ruling — but exposure on similar products persists
By settling, US Conec avoids a court finding of infringement or invalidity. However, no claim was found invalid, meaning Senko’s portfolio retains its teeth for any future products or third parties. The with-prejudice dismissal protects US Conec only against re-litigation of the specific claims in this action. If US Conec introduces new products in the MDC/MMC space, fresh infringement exposure under these patents cannot be ruled out.
No invalidity ruling obtainedSenko’s MDC/MMC patent wall strengthened as a market signal
The settlement, reached after 616 days and covering seven patents across nine product families, suggests Senko’s MDC/MMC patent portfolio carries sufficient breadth to compel a negotiated outcome from a direct competitor. For other MDC/MMC connector manufacturers and integrators, this case consistently signals that Senko is prepared to enforce its IP through extended litigation. Competitors operating in the small-form-factor fiber connector space should treat this portfolio as a live enforcement risk.
Active enforcement posture confirmedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Senko Advanced Components, Inc. | Company | Fiber optic connectivity components manufacturer — holder of US11181701B2 and 6 related MDC/MMC patentsSearch in Eureka ↗ |
| Defendant | US Conec, Ltd. | Company | US Conec, Ltd. — fiber optic connector manufacturer; maker of accused MDC and MMC connector/adapter productsSearch in Eureka ↗ |
| Plaintiff counsel | Alexis Stombaugh | Attorney | Counsel for Senko Advanced Components, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Anne Shea Gaza | Attorney | Counsel for Senko Advanced Components, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Kevin D. Conneely | Attorney | Counsel for Senko Advanced Components, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Robert M. Vrana | Attorney | Counsel for Senko Advanced Components, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Timothy D. Krieger | Attorney | Counsel for Senko Advanced Components, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Young Conaway Stargatt & Taylor, LLP | Law Firm | Representing Senko Advanced Components, Inc.Search in Eureka ↗ |
| Defendant counsel | Caleb J. Bean | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | Jack B. Blumenfeld | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | James Harry Stone Levine | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | Joshua Weeks | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | Katherine G. Rubschlager | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | Kirk T. Bradley | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | Matthew M. Turk | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | Michael J. Newton | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | Rodger Dallery Smith , II | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | Ross R. Barton | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | Shawn P. Gannon | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant counsel | Yuri Mikulka | Attorney | Counsel for US Conec, Ltd.Search in Eureka ↗ |
| Defendant law firm | Morris, Nichols, Arsht & Tunnell LLP | Law Firm | Representing US Conec, Ltd.Search in Eureka ↗ |
| Defendant law firm | Troutman Pepper Hamilton Sanders, LLP | Law Firm | Representing US Conec, Ltd.Search in Eureka ↗ |
| Presiding judge | Judge Jon P McCalla | Judge | Delaware District CourtSearch in Eureka ↗ |
Official order — verbatim text
The stipulated dismissal language — ‘pursuant to the terms of the parties’ Settlement Agreement’ and ‘with prejudice’ — confirms this was a negotiated exit rather than a contested ruling. The with-prejudice designation forecloses any refiling of these specific claims, providing US Conec certainty on the litigated products. Critically, the mutual cost-bearing provision, with no fee-shifting, is consistent with a balanced settlement rather than one party capitulating. The underlying settlement agreement governs the commercial terms but is not part of the public record.
US11181701B2 and 6 co-asserted patents — MDC/MMC fiber optic connector technology
The seven asserted patents — US11181701B2, US11415760B2, US11307369B2, US11333836B2, US10191230B2, US11061190B2, and US11340413B2 — collectively cover the design, mechanical architecture, and interconnect configurations of MDC (Miniature Duplex Connector) and MMC fiber optic connectors and adapters. Application dates span from US15/884327 (an earlier priority) through the US17-series applications, indicating a sustained patent prosecution strategy by Senko to build layered coverage across successive product generations.
MDC and MMC connectors represent the small-form-factor frontier of fiber optic connectivity, enabling higher port density in data centre and enterprise switching environments. Senko’s multi-patent filing strategy — covering UPC and APC variants, aligned and opposed key adapters, and junior-form-factor products — suggests a deliberate effort to create a patent thicket around the MDC ecosystem. For competitors in the high-density fiber interconnect market, this portfolio represents a material FTO risk across the full product stack, from individual connectors to multi-port adapters.
Should you run an FTO against Senko’s MDC/MMC connector patent portfolio?
Any company designing, manufacturing, or distributing MDC or MMC fiber optic connectors, adapters, or associated hardware should treat this seven-patent portfolio as a primary FTO target. The breadth of accused products in this case — spanning UPC, APC, aligned-key, and junior-form-factor variants — indicates Senko’s patents are drafted to cover a wide range of commercial implementations, not a single product design.
PatSnap Eureka’s FTO Search Agent allows R&D and IP teams to map their MDC/MMC connector designs against Senko’s claim language in minutes, identifying overlap across all seven asserted patents. Eureka can also surface related continuation applications and prosecution history to assess claim scope, helping teams design around risks before product launch rather than after a cease-and-desist letter arrives.
Run a freedom-to-operate analysis on US11181701B2 to assess your product’s exposure
Run FTO in Eureka →Similar fiber optic connector patent infringement cases in Delaware federal courts
Cases involving multi-patent fiber optic connector disputes in the Delaware District Court, including MDC, MMC, and small-form-factor interconnect technology infringement actions.
What this case signals for the fiber optic connector IP landscape
A seven-patent settlement in the MDC/MMC connector space carries strategic weight well beyond the two parties involved.
Senko’s MDC/MMC portfolio is a proven enforcement vehicle
Filing seven patents in a single action and sustaining litigation for 616 days demonstrates Senko’s commitment to enforcing its small-form-factor fiber connector IP. Companies developing or sourcing MDC/MMC connectors and adapters should assess overlap with the asserted portfolio before product launch or procurement.
With-prejudice settlement leaves all seven patents legally intact
No patent was declared invalid or unenforceable. Senko retains full freedom to assert US11181701B2 and its six co-asserted patents against new entrants or on different product generations. The absence of an IPR record in public filings suggests US Conec did not pursue PTAB review as a defensive strategy — at least not publicly.
Senko v US — key questions answered
Senko asserted seven US patents: US11181701B2, US11415760B2, US11307369B2, US11333836B2, US10191230B2, US11061190B2, and US11340413B2. All cover MDC and MMC fiber optic connector and adapter technology. The accused products included MDC UPC and APC connectors, multi-port adapters, and MMC connectors and adapters.
The case was resolved by a stipulated dismissal with prejudice under Federal Rule of Civil Procedure 41(a)(1)(A)(ii), entered pursuant to a private settlement agreement. All claims and counterclaims were dismissed with prejudice. Each party bears its own costs, expenses, and attorney’s fees. The financial terms of the settlement agreement are not publicly disclosed.
Dismissal with prejudice bars Senko from refiling the same infringement claims against US Conec for the same accused products. However, it does not invalidate Senko’s patents. All seven asserted patents remain enforceable against other parties. No court found any claim invalid or unenforceable, so the patents retain their full legal strength in future enforcement actions.
The accused products were: MDC 2-Port Adapter Aligned Key MDC/MDC, MDC 3-Port Adapter MDC/MDC Jr., MDC 4-Port Adapter Aligned Key MDC/MDC, MDC 4-Port Adapter MDC/MDC Jr., MDC 4-Port Adapter Opposed Key MDC/MDC, MDC APC Connector, MDC UPC Connector, MMC Adapter, and MMC Connector — nine product families spanning the US Conec MDC and MMC connector portfolio.
The case ran for 616 days from filing (January 24, 2023) to closing (October 1, 2024). This duration is above the median for single-plaintiff patent infringement cases in the Delaware District Court, which typically suggests the parties engaged in meaningful claim construction briefing or discovery before reaching settlement terms. The breadth of seven patents and nine accused products is consistent with a prolonged pre-settlement process.
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