Corning v. Leviton: Fiber Optic Enclosure Patents Dismissed With Prejudice After 1,722 Days
Corning, Inc. brought a patent infringement action against Leviton Manufacturing Co., Inc. in Delaware over four patents covering fiber optic rack-mount enclosure technology, targeting Leviton's Opt-X UHDX product line. After nearly five years of litigation, the parties reached a confidential settlement and the case was dismissed with prejudice on May 6, 2026.
Corning's Fiber Patent Campaign Reaches Confidential Resolution in Delaware
On August 18, 2021, Corning, Inc. filed suit against Leviton Manufacturing Co., Inc. in the U.S. District Court for the District of Delaware (Case No. 1:21-cv-01185), before Judge Colm F. Connolly. Corning asserted four patents — US10120153B2, US10444456B2, US9020320B2, and US8712206B2 — covering fiber optic rack-mount enclosure technology, and accused Leviton's Opt-X UHDX Fiber Rack-Mount Enclosures of infringement across a broad range of specific part numbers.
The case was dismissed with prejudice on May 6, 2026, pursuant to a stipulation filed under Federal Rule of Civil Procedure 41(a)(1)(A)(ii). The stipulation references a Settlement Agreement dated May 1, 2026, executed by both parties. The specific terms of that agreement are described as confidential and are not disclosed in the public record. Each party agreed to bear its own costs, attorneys' fees, and expenses.
At 1,722 days, the litigation ran for nearly five years — a duration consistent with complex multi-patent disputes in Delaware that proceed through significant pretrial stages before resolution. What drove the parties to settle at this juncture, and any licensing or cross-license arrangements embedded in the Settlement Agreement, are not reflected in the available record. The inclusion of counterclaims by Leviton — all of which are also dismissed — suggests the dispute was substantively contested on multiple fronts before the parties reached terms.
See Complete Case & Patent Analysis →Filing to Dismissed with Prejudice in 1722 days
Days from filing to dismissal — nearly 5 years of active litigation in D. Delaware
US10120153B2 and three further patents — fiber optic rack-mount enclosure technology
Any manufacturer, integrator, or distributor of high-density fiber rack-mount enclosures should treat this four-patent family as a live FTO priority. The breadth of accused Leviton products — more than 90 part numbers — suggests claim coverage that may extend across design variations. Companies developing or sourcing rack-mount fiber enclosures for data centre or enterprise structured cabling should conduct a targeted FTO analysis before commercialisation.
Official order — verbatim text
The stipulation, filed under Rule 41(a)(1)(A)(ii), reflects a bilateral agreement to end all claims and counterclaims with prejudice, referencing a confidential Settlement Agreement dated May 1, 2026. The recorded Basis of Termination is 'Dismissed with Prejudice'; the docket order is a Rule 41 stipulated dismissal grounded in that settlement. The specific commercial terms embedded in the Settlement Agreement are not disclosed in the available record.
Dismissed with prejudice: what the stipulated resolution means for both parties
Rule 41(a)(1)(A)(ii) stipulated dismissal with prejudice
A Rule 41(a)(1)(A)(ii) dismissal is filed by joint stipulation of all parties who have appeared. The 'with prejudice' designation means Corning cannot re-file the same claims against Leviton on the same patents. This is a final, binding termination of the litigation on the asserted claims and all counterclaims. The dismissal references a confidential Settlement Agreement as its underlying basis.
Final — no re-filing permittedCorning's claims end; patent enforceability against Leviton is resolved
Dismissal with prejudice bars Corning from reasserting these four patents against Leviton for the same accused products. However, the patents themselves remain in force and enforceable against third parties. The confidential Settlement Agreement governs any ongoing relationship between the parties — its specific terms are not disclosed in the available record.
Patents intact vs. third partiesLeviton's counterclaims also dismissed; exposure to these patents ends
All of Leviton's counterclaims are dismissed with prejudice alongside Corning's infringement claims. Leviton's Opt-X UHDX product line is no longer the subject of active litigation under these four patents. Whether Leviton received any specific commercial accommodation under the Settlement Agreement is not reflected in the public record.
All counterclaims closedFiber enclosure IP landscape: Corning's patent portfolio remains active against others
The four asserted patents covering fiber optic rack-mount enclosure technology remain valid and enforceable against the broader market. Competitors and customers in the structured cabling and data center infrastructure space who design or sell similar rack-mount fiber enclosures should treat these patents as live enforcement risk. The resolution of this dispute does not limit Corning's ability to assert these patents elsewhere.
Continued third-party exposureFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Corning, Inc. | Company | /Search in Eureka ↗ |
| Defendant | Leviton Manufacturing Co., Inc. | Company | /Search in Eureka ↗ |
| Plaintiff counsel | David Evan Ross | Attorney | Counsel for Corning, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Eric David Selden | Attorney | Counsel for Corning, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Ross Aronstam & Moritz LLP | Law Firm | Representing Corning, Inc.Search in Eureka ↗ |
| Defendant counsel | Eric W. Lin | Attorney | Counsel for Leviton Manufacturing Co., Inc.Search in Eureka ↗ |
| Defendant counsel | Karen Elizabeth Keller | Attorney | Counsel for Leviton Manufacturing Co., Inc.Search in Eureka ↗ |
| Defendant counsel | Kyle W.K. Mooney | Attorney | Counsel for Leviton Manufacturing Co., Inc.Search in Eureka ↗ |
| Defendant counsel | Nathan Roger Hoeschen | Attorney | Counsel for Leviton Manufacturing Co., Inc.Search in Eureka ↗ |
| Defendant counsel | Stefani E. Shanberg | Attorney | Counsel for Leviton Manufacturing Co., Inc.Search in Eureka ↗ |
| Defendant counsel | Veronica S. Ascarrunz | Attorney | Counsel for Leviton Manufacturing Co., Inc.Search in Eureka ↗ |
| Defendant law firm | Shaw Keller LLP | Law Firm | Representing Leviton Manufacturing Co., Inc.Search in Eureka ↗ |
| Presiding judge | Judge Colm F. Connolly | Judge | Delaware District CourtSearch in Eureka ↗ |
R&D signals in the fiber optic enclosure and connectivity space
This Corning v. Leviton dispute surfaces patent and innovation intelligence signals relevant to fiber optic rack-mount enclosure design, high-density connectivity, and structured cabling infrastructure.
Corning's fiber enclosure patent family: depth and continuation risk
Corning's four asserted patents span application dates from 2010 to 2019, suggesting an active prosecution strategy in fiber rack-mount enclosure design. Companies in this space should monitor Corning's continuation and continuation-in-part filings that may extend claim coverage beyond the four asserted patents into next-generation enclosure architectures.
Active family — monitor continuationsHigh-density fiber enclosure filing trends: who is patenting in this space?
High-density fiber rack-mount enclosures sit at the intersection of data centre infrastructure build-out and structured cabling standardisation. Patent filing activity in this domain — from Corning, CommScope, Panduit, and others — signals active R&D investment. Tracking claim trends around module density, cable routing, and adapter plate design reveals where the next generation of competitive IP is forming.
Data centre connectivity IP trendsLeviton's Opt-X UHDX IP position and defensive patent activity
Leviton asserted counterclaims in this action — a signal that it has developed its own IP assets in the fiber connectivity space. Analysing Leviton's patent filings around the Opt-X UHDX product line may reveal defensive or offensive portfolio depth that is relevant to competitors and technology partners operating in the high-density fiber enclosure market.
Leviton enclosure IP — counterclaim signalAdjacent innovation opportunities near fiber rack-mount enclosure IP
The cluster of patents asserted here focuses on physical enclosure design and cable routing. Adjacent areas — including intelligent patch panel management, automated fibre identification, and modular enclosure interoperability for cloud-scale deployments — may represent lower-density IP white space where new entrants and incumbents can file defensively or differentiate commercially.
Adjacent R&D white spaceSimilar fiber optic enclosure patent disputes in Delaware District Court
Explore comparable patent infringement actions involving fiber optic connectivity and rack-mount enclosure technology filed in the U.S. District Court for the District of Delaware.
What this case signals for the fiber optic enclosure IP landscape
Corning's four-patent assertion in Delaware signals active enforcement of its fiber infrastructure IP across a wide product portfolio.
Corning's multi-patent strategy targets the structured cabling product tier
Asserting four patents simultaneously — spanning application dates from 2010 to 2019 — signals that Corning has built layered IP coverage around fiber rack-mount enclosure designs. Companies commercialising similar high-density enclosures should map their products against this patent family before go-to-market.
Each party bearing own costs is a neutral cost signal, not a concession
The mutual cost-bearing arrangement in the stipulation avoids any fee-shifting inference. This is standard in settled patent disputes and does not indicate which party held the stronger legal position. The confidential settlement terms govern the commercial resolution — those terms are not in the public record.
Corning v Leviton — key questions answered
Corning asserted four patents: US10120153B2, US10444456B2, US9020320B2, and US8712206B2. All four cover fiber optic rack-mount enclosure technology and were filed across application dates ranging from approximately 2010 to 2019. The accused products were Leviton's Opt-X UHDX Fiber Rack-Mount Enclosures, comprising more than 90 specific part numbers.
The case was dismissed with prejudice on May 6, 2026, pursuant to a joint stipulation filed under Federal Rule of Civil Procedure 41(a)(1)(A)(ii). The stipulation references a Settlement Agreement dated May 1, 2026. The specific terms of that agreement are described as confidential and are not disclosed in the public record. Each party agreed to bear its own costs and attorneys' fees.
Dismissal with prejudice bars Corning from re-asserting the same claims against Leviton for the same accused products. However, the four patents — US10120153B2, US10444456B2, US9020320B2, and US8712206B2 — remain in force and are enforceable against third parties. The dismissal does not affect Corning's ability to assert these patents in separate proceedings against other defendants.
Yes. The stipulated dismissal references counterclaims asserted by Leviton Manufacturing Co., Inc. All counterclaims are dismissed with prejudice under the same stipulation. The nature and substance of Leviton's counterclaims are not detailed in the available public record of the dismissal order.
Corning was represented by Ross Aronstam & Moritz LLP, with attorneys David Evan Ross and Eric David Selden listed as agents of record. Leviton was represented by Shaw Keller LLP, with six attorneys listed including Eric W. Lin, Karen Elizabeth Keller, Kyle W.K. Mooney, Nathan Roger Hoeschen, Stefani E. Shanberg, and Veronica S. Ascarrunz. The case was assigned to Judge Colm F. Connolly in the U.S. District Court for the District of Delaware.
This page is compiled from public court dockets and third-party patent and litigation data via PatSnap Eureka, and is provided for general informational purposes only. The information shown — including party names, patent and application numbers, dates, case status, outcomes, and any analysis — may be incomplete, may not reflect the most recent filings or legal status, and may contain errors or omissions. Verify all details against official court records (for example, PACER) and the relevant patent office before relying on them.
Nothing on this page constitutes legal advice or a legal opinion on the validity, infringement, enforceability, or scope of any patent or case, and no attorney‑client relationship is created by its use. Any description of an outcome (such as a dismissal, settlement, or consent judgment) is a general summary, not a legal determination. All patents, trademarks, and company or law‑firm names are the property of their respective owners. PatSnap makes no warranty as to the accuracy or completeness of this content and disclaims, to the fullest extent permitted by law, all liability for reliance on it. For advice on a specific matter, consult qualified legal counsel.
PatSnap Eureka searches patents and litigation data to answer instantly.