23-2443

Ongoing Proxy Network Patent Dispute Reaches Federal Circuit

This patent infringement litigation, currently before the U.S. Court of Appeals for the Federal Circuit (Case No. 23-2443), involves two prominent competitors in the web data gathering industry: Bright Data, Ltd. (formerly Luminati Networks Ltd.) as the plaintiff-appellant, and Oxylabs (comprising Teso LT, UAB, Oxysales, UAB, and Metacluster LT, UAB) as the defendant-appellee. Bright Data is an operating company known for its residential proxy network services and real-time crawlers, while Oxylabs is also an operating company providing large-scale web data gathering solutions. Bright Data accuses Oxylabs' residential proxy network service and Real-Time Crawler technology of infringing U.S. Patent No. 10,257,319. Patent '319 generally relates to methods and systems for managing network requests, often in the context of proxy networks for data collection.

The case originated in the United States District Court for the Eastern District of Texas, Marshall Division, presided over by Judge J. Rodney Gilstrap. The Federal Circuit holds exclusive appellate jurisdiction over district court cases involving patent claims, making it the designated venue for this appeal. This litigation is notable as it represents a continuation of an ongoing and contentious legal battle between these two industry leaders, with Oxylabs having previously filed antitrust counterclaims against Bright Data, alleging monopolization and the use of sham patent infringement lawsuits to stifle competition in the residential proxy marketplace. This broader context highlights significant industry impact, as the outcome could influence competition and innovation within the rapidly growing field of large-scale web data collection. While details of specific IPRs directly linked to this Federal Circuit appeal are not explicitly detailed in the provided information, the history of extensive litigation between these parties suggests that post-grant challenges are often a component of such disputes in this industry.

This legal summary details the key developments and outcome of the patent infringement litigation involving Bright Data, Ltd. and Oxylabs, focusing on U.S. Patent No. 10,257,319, among others.

Key Legal Developments and Outcome

1. Filing & Initial Pleadings (District Court)

• 2019-12-06: Bright Data (then Luminati) filed a patent infringement lawsuit against Oxylabs (comprising Teso LT, UAB, Oxysales, UAB, and Metacluster LT, UAB) in the U.S. District Court for the Eastern District of Texas, Marshall Division (Case No. 2:19-cv-00395-JRG). The lawsuit asserted infringement of U.S. Patents 10,257,319; 10,484,510; and 10,469,614.

2. Claim Construction (Markman) Outcomes

• 2019-08-21: The District Court issued a Claim Construction Order in a related case (Case No. 299) that was critical for subsequent stages. This order invalidated one of the patent claims asserted by Bright Data.
• 2021-06-24: Oxylabs filed a motion for a hearing regarding an O2 Micro issue, indicating a dispute over the proper interpretation of "server" claim terms in patents including 10,257,319, ahead of the scheduled trial. Bright Data opposed this motion.

3. Trial Events, Verdict, and Post-Trial Motions (District Court)

• 2021-11-05: A federal jury in the Eastern District of Texas returned a verdict in favor of Bright Data. The jury found that Oxylabs willfully infringed Bright Data's patent rights, including those of Patent 10,257,319, and that all asserted Bright Data patent claims were valid. The jury concluded that Oxylabs should compensate Bright Data for its lost profits. Oxylabs expressed disappointment with the verdict and stated its intention to appeal.

4. Parallel PTAB IPR/PGR Proceedings

• Oxylabs challenged the validity of Bright Data's patents, including 10,257,319, before the U.S. Patent Office (USPTO) through Inter Partes Review (IPR) proceedings. For Patent 10,257,319, IPRs IPR2021-01492, IPR2022-00135, and IPR2022-00915 are relevant.
• The District Court case was stayed pending the final outcome of these related patent invalidation proceedings at the USPTO.

5. Appeal to the Federal Circuit and Supreme Court Review

• 2023-07-13: Bright Data filed an appeal (Case No. 23-2443, along with 23-2144, 23-2145, 23-2146, 23-2147) with the U.S. Court of Appeals for the Federal Circuit, challenging underlying invalidity or cancellation determinations for several of its patents, including 10,257,319, 10,484,510, 11,044,342 and 11,044,344.
• 2025-08-01: The Federal Circuit affirmed the decisions of the USPTO, upholding the unpatentability of claims from multiple Bright Data patents, including 10,257,319. The court found no reversible error in the lower tribunals' invalidity determinations, rendering the unpatentability findings final at the appellate level.
• 2026-01-05: Bright Data filed a Petition for a Writ of Certiorari with the U.S. Supreme Court (Case No. 25-779), seeking review of the Federal Circuit's decision, arguing that the refusal to consider disclaimers made during IPR proceedings created uncertainty.
• 2026-02-23: The U.S. Supreme Court denied Bright Data's petition for certiorari, concluding Case No. 25-779. This denial left the Federal Circuit's decisions intact and conclusively confirmed that the patents in question, including 10,257,319, are invalid.

6. Final Disposition

The Federal Circuit's affirmance of the USPTO's invalidation of Patent 10,257,319 and other patents, followed by the Supreme Court's denial of certiorari, means that the asserted claims of Patent 10,257,319 are now deemed unpatentable and unenforceable. This outcome effectively extinguishes Bright Data's patent protection for these specific claims and is considered a significant victory for Oxylabs in their ongoing legal disputes. Oxylabs has stated that the Federal Circuit's decision upholding the invalidation of claims from two of the three patents-in-suit means that the 2021 jury's infringement verdict cannot stand and, if all asserted claims are eventually invalidated, the case will be dismissed with prejudice.

Bright Data, Ltd. (formerly Luminati Networks Ltd.) is represented by the following counsel:

• Robert M. Harkins Jr. (Counsel of Record)

  • Firm: Cherian LLP
  • Office Location: Berkeley, CA
  • Experience: Mr. Harkins has represented Bright Data in various stages of this and related patent disputes, including filings with the U.S. Supreme Court.

• Korula T. Cherian (Counsel of Record)

  • Firm: Cherian LLP
  • Office Location: Berkeley, CA
  • Experience: Mr. Cherian has been involved in the representation of Bright Data in its patent litigation, including before the Supreme Court.

• Amadou Kilkenny Diaw

  • Firm: Goodwin Procter, LLP
  • Office Location: Washington, DC
  • Experience: Mr. Diaw represented Bright Data in the underlying District Court case in the Eastern District of Texas.

• Colby Alexander Davis

  • Firm: RuyakCherian LLP (as of 2022)
  • Office Location: Washington, DC
  • Experience: Mr. Davis was listed as counsel for Bright Data in the District Court proceedings.

• Craig Hoovler

  • Firm: RuyakCherian LLP (as of 2022)
  • Office Location: Washington, DC
  • Experience: Mr. Hoovler was listed as counsel for Bright Data in the District Court proceedings.

• Ronald Wielkopolski

  • Firm: RuyakCherian LLP (as of 2022)
  • Office Location: Washington, DC
  • Experience: Mr. Wielkopolski was listed as counsel for Bright Data in the District Court proceedings.

• Thomas M. Dunham

  • Firm: RuyakCherian LLP (as of 2022)
  • Office Location: Washington, DC
  • Experience: Mr. Dunham was listed as counsel for Bright Data in the District Court proceedings.

• Elizabeth L. DeRieux

  • Firm: Capshaw DeRieux LLP
  • Office Location: Gladewater, TX
  • Experience: Ms. DeRieux served as local counsel for Bright Data in the Eastern District of Texas.

• Sidney Calvin Capshaw, III

  • Firm: Capshaw DeRieux LLP
  • Office Location: Gladewater, TX
  • Experience: Mr. Capshaw served as local counsel for Bright Data in the Eastern District of Texas.

• Gregory Blake Thompson

  • Firm: Mann Tindel & Thompson
  • Office Location: Henderson, TX
  • Experience: Mr. Thompson served as local counsel for Bright Data in the Eastern District of Texas, and also in a related case in the Western District of Texas.

• James Mark Mann

  • Firm: Mann Tindel & Thompson
  • Office Location: Henderson, TX
  • Experience: Mr. Mann served as local counsel for Bright Data in the Eastern District of Texas.

It should be noted that while case 23-2443 is listed as currently in litigation at the Federal Circuit, several sources indicate that the Federal Circuit affirmed the unpatentability of patent 10,257,319 (among others) on August 1, 2025, and some sources even indicate the Supreme Court declined to review the case on February 23, 2026, making the outcome final. This suggests the appeal for this specific patent may be concluded, though Bright Data has been involved in numerous parallel litigations with Oxylabs and related entities.

The defendant-appellee in this case, Oxylabs (Teso LT, UAB, Oxysales, UAB, and Metacluster LT, UAB), was represented by counsel from Norton Rose Fulbright US LLP and Charhon, Callahan, Robson & Garza PLLC in the underlying District Court proceedings (Case No. 2:19-CV-00395-JRG). While the specific counsel of record for the Federal Circuit appeal (Case No. 23-2443) is not explicitly detailed in all search results, Norton Rose Fulbright is consistently mentioned as having successfully defended the unpatentability finding at the appellate level for the "Code 200 defendant group," which includes Teso LT, Metacluster LT, and Oxysales, UAB, in a related appeal (23-2147) involving a different patent (US11044344B2) but the same parties. It is highly probable that Norton Rose Fulbright also represented Oxylabs in the appeal for patent 10,257,319, given their continuous representation in the broader dispute and their success in defending against Bright Data's patents at the Federal Circuit.

Based on available information for the related proceedings and general firm specializations in patent litigation and appeals, the following attorneys are likely to have represented Oxylabs at the Federal Circuit:

Counsel of Record (Likely from Federal Circuit Appeal):

• Firm: Norton Rose Fulbright US LLP
  • Experience: Norton Rose Fulbright successfully defended the unpatentability finding at the appellate level in a related case involving the same parties. They are noted for their robust defense team in this ongoing dispute.

While specific individual attorneys from Norton Rose Fulbright for this particular Federal Circuit case (23-2443) are not explicitly named in the provided search snippets, the firm's involvement is well-established. For the underlying District Court case (2:19-CV-00395-JRG), the following attorneys represented Oxylabs:

District Court Counsel (Eastern District of Texas - Case No. 2:19-CV-00395-JRG):

• Steven Chase Callahan (Counsel)
  • Firm: Charhon, Callahan, Robson & Garza PLLC
  • Office Location: Dallas, TX
  • Experience: Mr. Callahan represented Oxylabs in the initial lawsuit and in their counterclaims against Bright Data, including issues of unfair competition and false advertising.
• Craig N. Tolliver (Counsel)
  • Firm: Charhon, Callahan, Robson & Garza PLLC
  • Office Location: Dallas, TX
  • Experience: Represented Oxylabs in the District Court proceedings.
• George T. Scott (Counsel)
  • Firm: Charhon, Callahan, Robson & Garza PLLC
  • Office Location: Dallas, TX
  • Experience: Represented Oxylabs in the District Court proceedings.
• John Charles Heuton (Counsel)
  • Firm: Charhon, Callahan, Robson & Garza PLLC
  • Office Location: Dallas, TX
  • Experience: Represented Oxylabs in the District Court proceedings.
• Mitchell Reed Sibley (Counsel)
  • Firm: Charhon, Callahan, Robson & Garza PLLC
  • Office Location: Dallas, TX
  • Experience: Represented Oxylabs in the District Court proceedings.
• Brett Christopher Govett (Counsel)
  • Firm: Norton Rose Fulbright US LLP
  • Office Location: Dallas, TX
  • Experience: Mr. Govett was involved in District Court proceedings and filed a motion to appear pro hac vice in a related case in the Western District of Texas.
• Daniel S. Leventhal (Counsel)
  • Firm: Norton Rose Fulbright US LLP
  • Office Location: Houston, TX
  • Experience: Represented Oxylabs in the District Court proceedings.
• Warren Szutse Huang (Counsel)
  • Firm: Norton Rose Fulbright US LLP
  • Office Location: Houston, TX
  • Experience: Represented Oxylabs in the District Court proceedings.
• Michael Charles Smith (Local Counsel)
  • Firm: Scheef & Stone, LLP
  • Office Location: Marshall, TX
  • Experience: Served as local counsel for Oxylabs in the Eastern District of Texas.
• Justinas Jarusevicius (Counsel)
  • Firm: Motieka & Audzevicius
  • Experience: Represented Oxylabs in the District Court proceedings.

It's important to note the information indicating that the Federal Circuit affirmed the unpatentability of patent 10,257,319 on August 1, 2025, and the Supreme Court declined review on February 23, 2026, making the outcome final for this specific patent. This suggests the Federal Circuit appeal for patent 10257319 is concluded.