WSOU Investments v. Cisco Systems: Jury Finds for Cisco After 1,540-Day Patent Battle
WSOU Investments sued Cisco Systems in the Western District of Texas asserting five patents against Cisco’s ASR packet core and Virtual Packet Core products. After a four-year fight, a unanimous jury returned a verdict for Cisco in February 2025, defeating WSOU’s infringement claims and finding the asserted patent invalid and subject to prior commercial use.
NPE patent broadside on Cisco’s packet core infrastructure ends in full defense verdict
WSOU Investments, LLC — a non-practicing entity associated with the former Brazos licensing programme — filed suit against Cisco Systems, Inc. on 5 February 2021 in the Western District of Texas before Judge Alan D. Albright. WSOU asserted five United States patents (US8191106, US7443859, US8665733, US9357014, and US8989216) against Cisco’s ASR 5000, ASR 5500, ASR 5700 Small Cell Gateway series and Virtual Packet Core products — infrastructure central to mobile carrier network deployments.
After four years of litigation, the case proceeded to jury trial on 10 February 2025. The jury returned a unanimous verdict on 12 February 2025 finding no direct infringement of US8989216 by Cisco, and further finding in Cisco’s favour on its affirmative defences of prior commercial use under 35 U.S.C. § 273 and invalidity under 35 U.S.C. § 102. Final judgment was entered against WSOU on all claims. The defendant’s prior-use defence is notable: a successful § 273 defence requires clear and convincing evidence that Cisco commercially used the relevant subject matter before the patent’s effective filing date.
A 1,540-day duration from filing to final judgment is substantial even for complex WDTX multi-patent litigation. The jury’s dual finding — no infringement and invalidity — effectively forecloses any appellate recovery on the merits for WSOU unless reversed. What drove the outcome precisely, including any claim construction rulings or pre-trial summary judgment dispositions affecting the remaining four patents, is not fully visible in the public docket summary. Whether WSOU pursues a Federal Circuit appeal remains to be seen.
Filing to Judgment on the merits for Defendant in 1540 days
1,540 days — well above the WDTX median for patent cases reaching jury verdict
Jury verdict for Cisco: what the ruling means for both parties
Jury found no infringement, invalidity, and prior commercial use
The jury returned findings on three separate legal bases, each independently fatal to WSOU’s case. No direct infringement means WSOU’s core claim failed on the merits. A finding of invalidity under § 102 (anticipation) nullifies the patent as to everyone. The § 273 prior commercial use defence, which requires clear and convincing evidence of pre-filing commercial use by the defendant, adds a further layer confirming Cisco’s long-standing use of the underlying technology predated WSOU’s patent rights.
Three independent defendant winsWSOU’s infringement claims fully extinguished at trial
Final judgment against WSOU on all claims means the patent assertions against Cisco’s ASR and Virtual Packet Core products are resolved with no damages, no injunction, and no licensing leverage. The invalidity finding, if unchallenged on appeal, threatens the commercial value of US8989216 across any future enforcement campaign. WSOU’s broader portfolio strategy — which has involved hundreds of suits — suffers a meaningful public precedent with this rare trial defeat.
Full plaintiff defeat at trialCisco secures complete vindication on patent and prior-use grounds
Cisco successfully defended its ASR 5000/5500/5700 and Virtual Packet Core product lines against infringement claims. The § 273 prior commercial use finding is commercially significant: it confirms Cisco’s packet core technology pre-existed the asserted patent claims. Combined with the invalidity ruling, Cisco has effectively neutralised US8989216 as a litigation threat. The verdict strengthens Cisco’s posture in any residual WSOU assertions across related patents.
Full defence verdict — no liabilityNPE enforcement against carrier-grade infrastructure faces heightened risk
This verdict signals that defendants with deep prior-use histories in mature networking infrastructure can successfully resist NPE assertions even in WDTX — historically plaintiff-friendly. The § 273 defence is rarely litigated to verdict; Cisco’s success here may prompt other infrastructure vendors to invest in documenting pre-filing commercial use. For WSOU and similar NPEs asserting legacy telecom patents, the trial-level risk calculus has shifted following this public defeat.
NPE enforcement risk recalibratedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | WSOU Investments, LLC | Company | Non-practicing entity (NPE) — holder of US8989216 and four further wireless network patentsSearch in Eureka ↗ |
| Defendant | Cisco Systems, Inc. | Company | Cisco Systems, Inc. — global networking infrastructure vendor, defendant on packet core productsSearch in Eureka ↗ |
| Plaintiff counsel | Aaron David Weisman | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Alden K. Lee | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Alexandra Fellowes | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Bryce T. Barcelo | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Danielle M. Nicholson | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Gregory Phillip Love | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | J. Hoke Peacock , III | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Joseph M. Abraham | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Kalpana Srinivasan | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Katherine Bentfield | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Larry Y. Liu | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Mark D. Siegmund | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Max L. Tribble , Jr. | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Scott Russell Maynard | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Shawn Blackburn | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Thomas V. DelRosario | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Timothy Franklin Dewberry | Attorney | Counsel for WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff law firm | AeroMech, Inc. | Law Firm | Representing WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Ahmad, Zavitsanos & Mensing | Law Firm | Representing WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Cherry Johnson Siegmund James PLLC | Law Firm | Representing WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Folio Law Group PLLC | Law Firm | Representing WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Rade LLC | Law Firm | Representing WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Steckler Wayne Cherry & Love PLLC | Law Firm | Representing WSOU Investments, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Susman Godfrey LLP | Law Firm | Representing WSOU Investments, LLCSearch in Eureka ↗ |
| Defendant counsel | Aileen Christina Huang | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Allen Kathir | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Allyson E. Parks | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Brian Rosenthal | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Claire Luisa Santiago | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Elizabeth R. Moulton | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Emily M. Whitcher | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Hyunjong Ryan Jin | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Katherine Dominguez | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Kenneth G. Parker | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Mark S. Davies | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Michael E. Jones | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Ryan Iwahashi | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant counsel | Shaun William Hassett | Attorney | Counsel for Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant law firm | Gibson Dunn & Crutcher LLP | Law Firm | Representing Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant law firm | Haynes & Boone LLP | Law Firm | Representing Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant law firm | Orrick Herrington & Sutcliffe LLP | Law Firm | Representing Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant law firm | Potter Minton PC | Law Firm | Representing Cisco Systems, Inc.Search in Eureka ↗ |
| Defendant law firm | White & Case LLP | Law Firm | Representing Cisco Systems, Inc.Search in Eureka ↗ |
| Presiding judge | Judge Alan D Albright | Judge | Texas Western District CourtSearch in Eureka ↗ |
Official order — verbatim text
The verdict language is unusually comprehensive: the jury found against WSOU simultaneously on infringement, invalidity under § 102, and prior commercial use under § 273. This triple finding is analytically redundant by design — each ground independently defeats WSOU’s claims — but it significantly strengthens Cisco’s appellate posture. Even if WSOU challenges the § 273 finding on appeal, the § 102 invalidity and no-infringement findings independently support the judgment. The specificity of the final judgment order, referencing the ECF docket of the jury verdict, suggests clean entry of judgment with minimal post-trial motion exposure for Cisco.
US8989216 — wireless packet core network routing technology
US8989216B2, the patent that proceeded to jury trial, originates from application US13/436321. It covers technology in the wireless packet core networking domain — the infrastructure layer managing data sessions between mobile devices and carrier networks. The patents in suit collectively span wireless network architecture (US8191106), packet data routing (US7443859), resource scheduling (US8665733), and LTE session mobility (US9357014), reflecting a portfolio assembled around the full stack of 4G/LTE packet core infrastructure. The jury’s invalidity finding under § 102 indicates the prior art anticipating US8989216 predated its claimed invention.
The strategic significance of these patents lies in their targeting of Cisco’s ASR 5000 series and Virtual Packet Core — products deployed by mobile network operators globally for 4G/LTE data plane processing. An NPE assertion against this product line carries substantial commercial threat given the products’ centrality to carrier revenue. Cisco’s successful § 273 prior-use defence suggests it had developed the underlying packet core technology independently and commercially before WSOU’s patent filing date, a finding that effectively negates the patent’s value against the industry’s dominant infrastructure vendors.
Should you run an FTO against US8989216 and related WSOU packet core patents?
Any vendor developing or deploying carrier-grade packet core, small cell gateway, or virtual network function (VNF) products in the 4G/LTE or 5G infrastructure space should assess exposure to WSOU’s remaining patent portfolio. Although US8989216 has been found invalid at trial, the other four asserted patents — US8191106, US7443859, US8665733, and US9357014 — were not adjudicated on the merits in this action. WSOU has filed hundreds of suits and may pursue these patents in separate proceedings against other defendants.
PatSnap Eureka’s FTO Search Agent allows R&D and product legal teams to map these specific patent numbers against your product architecture, identify claim elements that touch packet core session management or gateway routing functions, and surface prior art relevant to any remaining assertions. Eureka can also monitor WSOU’s litigation activity across all US district courts, alerting you to new filings before service.
Run a freedom-to-operate analysis on US8191106B2 to assess your product’s exposure
Run FTO in Eureka →Similar patent cases: NPE assertions in wireless packet core and LTE infrastructure
Cases involving NPE patent assertions against carrier networking infrastructure in the Western District of Texas, covering LTE packet core and gateway technology.
What this case signals for the networking and telecom IP landscape
A full defence verdict with invalidity and prior-use findings reshapes the risk profile for NPE assertions against established networking infrastructure vendors.
Prior commercial use (§ 273) is an underused but powerful trial defence
Cisco’s successful § 273 defence — requiring clear and convincing evidence of pre-filing commercial use — is one of the rarest patent trial outcomes. Networking and telecom vendors with long product histories should systematically document commercial use dates for core technology, creating an evidentiary record that can defeat even facially valid patent claims.
Invalidity at trial creates portfolio-wide risk for WSOU’s related patents
A jury invalidity finding on US8989216 under § 102 (anticipation) has implications beyond this case. Related patents in WSOU’s wireless infrastructure portfolio sharing similar priority chains or claim language may face heightened invalidity scrutiny in subsequent litigation, reducing WSOU’s settlement leverage across the board.
WSOU v Cisco — key questions answered
The jury returned a unanimous verdict on 12 February 2025 finding no direct infringement of US8989216 by Cisco, and further finding in Cisco’s favour on its affirmative defences of prior commercial use under 35 U.S.C. § 273 and invalidity under 35 U.S.C. § 102. Final judgment was entered against WSOU on all claims.
Section 273 provides a defence to patent infringement where the defendant commercially used the subject matter of the patent before the effective filing date of the asserted patent claim. It requires clear and convincing evidence. In this case, the jury found Cisco met that standard with respect to US8989216, effectively confirming Cisco’s packet core technology predated the patent’s claimed invention — a rare and powerful trial outcome for a defendant.
WSOU accused the Cisco ASR 5000 Small Cell Gateway Series, the Cisco ASR 5500, the Cisco ASR 5700, and the Cisco Virtual Packet Core product line. These are carrier-grade packet data network infrastructure products used by mobile network operators for 4G/LTE data plane processing.
WSOU originally asserted five patents: US8191106, US7443859, US8665733, US9357014, and US8989216. The jury trial proceeded on US8989216 (application US13/436321). The disposition of the other four patents prior to trial — whether through claim construction, summary judgment, or stipulation — is not fully reflected in the public docket summary available.
A § 102 invalidity finding at trial carries significant weight. While it binds only the parties in this case, it creates a public record of anticipating prior art that WSOU’s opponents in other litigation can reference. Related patents in WSOU’s wireless infrastructure portfolio with overlapping priority chains or similar claim scope may face heightened invalidity scrutiny, potentially reducing WSOU’s settlement leverage in future enforcement campaigns.
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