Ledup Manufacturing Group Ltd v. Seasonal Specialties LLC

Case Overview & Background

This appeal arises from a dispute between two direct competitors in the seasonal and decorative lighting market. The appellant, Ledup Manufacturing Group Ltd ("Ledup"), is a lighting manufacturer with operations in China and the United States. The appellee, Seasonal Specialties LLC ("Seasonal Specialties"), is a major Minnesota-based importer and wholesaler of holiday lighting and decorations for large retailers. Both are operating companies. The dispute centers on patented technology that ensures a string of lights remains lit even if an individual bulb burns out or is removed—a common feature in modern Christmas lights.

The technology at issue is a "resistive bypass" circuit for lights wired in series. When one bulb in a series fails, the entire circuit breaks, and all the lights go out. The accused products and patented technology solve this problem by placing a resistor in parallel with each light source; if a bulb fails, the resistor completes the circuit, allowing electricity to bypass the broken bulb and keep the other lights illuminated. The specific patent asserted is U.S. Patent No. 11,096,252, owned by Seasonal Specialties, which claims "A resistor bypass circuit for a series lighting circuit includ[ing] a plurality of serially connected light sources and a bypass resistor being connected in parallel with at least one of the respective light sources."

The case is before the Court of Appeals for the Federal Circuit on appeal from a Final Written Decision of the Patent Trial and Appeal Board (PTAB). This procedural posture is significant. The dispute began when Seasonal Specialties sued Ledup for patent infringement in the Central District of California. In response, Ledup challenged the validity of the '252 patent by filing a petition for inter partes review (IPR) at the PTAB (IPR2024-01258). The PTAB issued a Final Written Decision on April 20, 2026. As the IPR petitioner, Ledup is now the appellant, which strongly indicates that the PTAB's decision was adverse to its position, upholding the patentability of the challenged claims. This appeal therefore represents a critical juncture in the ongoing conflict between these two market rivals over a key product feature. The Federal Circuit's decision will likely determine whether Ledup can continue to sell its competing products or if Seasonal Specialties can successfully enforce its patent rights.

Litigation Timeline: Parallel District Court and PTAB Proceedings

The dispute between Seasonal Specialties and Ledup has progressed on dual tracks: a patent infringement lawsuit in the Central District of California and a parallel validity challenge at the Patent Trial and Appeal Board (PTAB), which has now moved to the Federal Circuit.

District Court Litigation: Seasonal Specialties LLC v. LEDup Enterprises LLC et al.*

• 2023-08-03: Complaint Filed. Seasonal Specialties filed a patent infringement lawsuit against Ledup Manufacturing Group Ltd. and its related entity, LEDup Enterprises LLC, in the U.S. District Court for the Central District of California (Case No. 2:23-cv-06318). The complaint alleged infringement of U.S. Patent No. 11,096,252, among others.
• 2023-10-04: Last Docketed Action & Stay. The district court case docket shows its last significant entry on this date. While specific orders are not detailed in the search results, the cessation of activity strongly suggests the court granted a stay pending the resolution of the inter partes review (IPR) that Ledup filed against the '252 patent. This is a common practice in patent litigation to conserve court and party resources until the Patent Office can provide its expert opinion on the patent's validity. The case remains pending but inactive, awaiting the outcome of the PTAB appeal.

Inter Partes Review: IPR2024-01258

• 2024-08-02: IPR Petition Filed. Acting as the petitioner, Ledup Manufacturing Group Ltd. challenged the validity of U.S. Patent No. 11,096,252 by filing a petition for inter partes review with the PTAB. This strategic move aimed to invalidate the patent on which Seasonal Specialties' infringement claims were based.
• PTAB Institution Decision (Approx. Early 2025): Although the specific date is not available in the search results, the PTAB would have issued a decision on whether to institute the IPR, typically about six months after the petition filing. Given that the case proceeded to a final decision, the Board found a "reasonable likelihood" that Ledup would prevail in challenging at least one claim of the '252 patent.
• 2026-04-20: Final Written Decision. The PTAB issued its Final Written Decision in IPR2024-01258. The substance of the decision is not detailed in the search results, but subsequent events confirm the outcome was unfavorable to Ledup. The Board likely found that Ledup failed to prove the challenged claims of the '252 patent were unpatentable.

Appeal to the Federal Circuit: Ledup Manufacturing Group Ltd v. Seasonal Specialties LLC

• 2026-04-21: Notice of Appeal Filed. Following its loss at the PTAB, Ledup filed a notice of appeal to the U.S. Court of Appeals for the Federal Circuit, the appellate court with exclusive jurisdiction over patent cases. The case was assigned docket number 26-1714.
• Current Posture: The case is in the earliest stages of the appeal. Ledup (as the appellant) will file its opening brief arguing that the PTAB erred in its decision, Seasonal Specialties (as the appellee) will file a response brief, and Ledup may file a reply. The court will then schedule oral arguments before a three-judge panel. The district court case in California remains stayed and its fate hinges on the outcome of this appeal. If the Federal Circuit affirms the PTAB's decision and upholds the patent, Seasonal Specialties will likely move to lift the stay and resume its infringement suit with a patent that has survived multiple validity challenges. Conversely, if the Federal Circuit reverses and invalidates the patent, the district court case will likely be dismissed.

Counsel for Appellant Ledup Manufacturing Group Ltd.

Based on the notice of appeal filed at the Federal Circuit, counsel for the appellant, Ledup Manufacturing Group Ltd., has been identified. This is consistent with counsel who represented Ledup in the underlying inter partes review.

• William W. Cochran (Lead Counsel)

  • Firm: Cochran Freund & Young LLC, Denver, CO.
  • Note: Mr. Cochran has extensive experience in patent prosecution and litigation, frequently representing clients in matters before the U.S. Patent and Trademark Office.

• J. Mark Smith (Of Counsel)

  • Firm: Fairfield and Woods, P.C., Denver, CO.
  • Note: Mr. Smith's practice focuses on commercial and intellectual property litigation, and he also represented Ledup in the related district court case.

• Lawrence M. Hadley (Of Counsel)

  • Firm: Glaser Weil Fink Howard Avchen & Shapiro LLP, Los Angeles, CA.
  • Note: Mr. Hadley is a seasoned trial lawyer specializing in intellectual property disputes and also represented Ledup in the district court litigation in the Central District of California.

Counsel for Appellee Seasonal Specialties LLC

Based on court filings in the related inter partes review and district court proceedings, the following attorneys have represented the defendant-appellee, Seasonal Specialties LLC. They are expected to formally appear in the Federal Circuit appeal.

• Joseph M. Kuo (Lead Counsel)

  • Firm: Saul Ewing LLP, Minneapolis, MN.
  • Note: Mr. Kuo is an experienced patent litigator who served as lead counsel for Seasonal Specialties in the underlying PTAB proceeding (IPR2024-01258) and the district court litigation.

• Janani K. Natarajan (Of Counsel)

  • Firm: Entorno Law, San Diego, CA.
  • Note: Ms. Natarajan's practice focuses on intellectual property litigation and counseling, and she has experience in both district court and administrative patent proceedings.

• Adam H. Gordon (Of Counsel)

  • Firm: The Bristol Group PLLC, Washington, D.C.
  • Note: Mr. Gordon specializes in appellate litigation, including matters before the Federal Circuit, and has represented clients in various trade and patent-related appeals.