Lian Li vs. Thermaltake: PC Fan Patent Case Stayed for IPR

Introduction

When two of the PC hardware industry’s most recognized brands collide over cooling fan technology, the stakes extend well beyond the courtroom. In Lian Li Industrial Co., Ltd. v. Thermaltake Technology, Co., Ltd. (Case No. 2:23-cv-07470), filed in the California Central District Court, a patent infringement dispute over PC cooling fan design has been placed on judicial hold — stayed pending an inter partes review (IPR) proceeding before the Patent Trial and Appeal Board (PTAB).

Filed on September 8, 2023, and officially removed from the court’s active caseload on March 7, 2025, the case centers on U.S. Patent No. 10,690,336 and the alleged infringement by Thermaltake’s Swafan EX 12 RGB PC Cooling Fan. After 546 days of active proceedings, the court’s stay order signals that the patent’s validity — not merely its infringement — is now the central battleground. For patent attorneys, IP professionals, and R&D leaders operating in the competitive PC components market, this case offers critical strategic insights into litigation posture, IPR timing, and freedom-to-operate risk.

Case Overview

The Parties

The Patent at Issue

The asserted patent, **U.S. Patent No. 10,690,336** (Application No. 16/403,867), covers technology in the PC cooling fan space. While the specific claims are not reproduced here, patents in this classification typically protect structural, mechanical, or aerodynamic innovations related to fan blade geometry, mounting systems, RGB integration, or modular connectivity — all commercially significant features in the premium PC cooling market.

• • US 10,690,336 — Innovations related to fan blade geometry, mounting systems, RGB integration, or modular connectivity.

The Accused Product

Thermaltake’s **Swafan EX 12 RGB PC Cooling Fan** is the product at the center of the infringement allegations. The Swafan EX 12 is a high-profile product in Thermaltake’s lineup, featuring swappable fan blade configurations and daisy-chain connectivity — features that may directly implicate the claims of the ‘336 patent.

Legal Representation

Plaintiff retained **Cooley LLP** and **Greenberg Traurig LLP** — two nationally recognized IP litigation powerhouses — with attorneys David Spencer Bloch, Kyle Dakai Chen, Mark R. Weinstein, Samuel C. Means, and Yang Liu leading the charge.

Defendant was represented by **Hudnell Law Group** and **Gikkas Law Firm, PC**, with Lewis E. Hudnell III, Nicolas S. Gikkas, and Stanley H. Thompson Jr. serving as defense counsel. Hudnell Law Group has a notable track record in patent defense matters, particularly for technology companies.

Litigation Timeline & Procedural History

The case was filed in the **California Central District Court**, a venue frequently selected in IP disputes involving technology companies with U.S. commercial operations — Thermaltake, Inc.’s U.S. presence made this a strategically appropriate filing jurisdiction for Lian Li.

The critical procedural inflection point arrived on **October 4, 2024**, when the court issued an order staying the litigation pending inter partes review. This stay — issued after an IPR petition was filed challenging the validity of U.S. Patent No. 10,690,336 — effectively paused all district court proceedings. The court ordered counsel to file a joint report within 14 days of any PTAB institution decision, while expressly retaining full jurisdiction over the action. The case was subsequently removed from the active docket on March 7, 2025, following the parties’ Joint Status Report (Dkt. 59).

The Verdict & Legal Analysis

Outcome

This case has not reached a final merits determination. The **basis of termination is a court-ordered stay**, with the matter pending PTAB’s decision on whether to institute inter partes review of U.S. Patent No. 10,690,336. No damages award, injunctive relief, or infringement finding has been issued. The district court retains jurisdiction and the litigation may resume depending on the PTAB’s institution decision and ultimate outcome.

Verdict Cause Analysis: The IPR Stay Dynamic

The court’s decision to stay proceedings pending IPR reflects a well-established judicial practice under Ethicon, Inc. v. Quigg and its progeny, where courts weigh: (1) whether a stay would unduly prejudice the patentee; (2) whether it would simplify the issues for trial; and (3) the stage of litigation. Here, the stay was granted — suggesting the court found that PTAB review could meaningfully narrow or resolve the validity questions before expensive trial proceedings.

From a strategic standpoint, Thermaltake’s apparent pursuit of an IPR petition represents a classic **dual-track defense** — contesting infringement in district court while simultaneously challenging the patent’s validity at the PTAB. This approach is particularly effective in cases involving hardware patents where prior art in adjacent technology domains (e.g., HVAC, industrial fans, modular electronics) may provide robust invalidity grounds.

The stay also benefits Thermaltake commercially: continued sales of the Swafan EX 12 can proceed without an immediate injunction risk while PTAB proceedings — which typically take 12–18 months post-institution — run their course.

Legal Significance

The case highlights the continued strategic relevance of **IPR petitions as a litigation defense tool** in district court patent cases. For PC hardware patents — a space where design iterations are rapid and prior art is abundant — IPR proceedings can be particularly potent. A successful IPR that cancels or narrows patent claims would directly limit Lian Li’s infringement theories in the district court, potentially mooting significant portions of the complaint.

Additionally, the involvement of two major law firms on the plaintiff’s side (Cooley LLP and Greenberg Traurig LLP) underscores the commercial significance Lian Li places on the ‘336 patent and its enforcement strategy.

Industry & Competitive Implications

The PC cooling components market is fiercely competitive, with Lian Li and Thermaltake occupying overlapping premium market positions. Patent assertions in this space are increasingly common as companies seek to protect differentiated product features — particularly RGB integration, modular connectivity, and aerodynamic innovations — that command price premiums and brand loyalty.

This litigation signals that **design differentiation in PC peripherals carries meaningful IP risk**, and that even well-established industry players are not immune to patent infringement actions from direct competitors. For companies in the PC components ecosystem — including motherboard manufacturers, system integrators, and OEM suppliers — this case is a reminder that competitive feature adoption without FTO clearance can trigger costly litigation.

The stay outcome also reflects a broader industry trend: **PTAB proceedings are increasingly used to reset the litigation playing field**, particularly in cases where the asserted patent’s validity may be uncertain. Companies holding hardware patents should proactively audit their portfolios for IPR vulnerability before initiating enforcement campaigns.

FAQ

What patent is at issue in Lian Li v. Thermaltake?

U.S. Patent No. 10,690,336 (Application No. 16/403,867), asserted against Thermaltake’s Swafan EX 12 RGB PC Cooling Fan in Case No. 2:23-cv-07470.

Why was the case stayed?

The California Central District Court issued a stay on October 4, 2024, pending inter partes review proceedings before the PTAB to assess the validity of the asserted patent.

How might this affect PC cooling fan patent litigation broadly?

This case reinforces that IPR petitions are an effective defense mechanism in hardware patent disputes, and that patent holders in the PC components space should anticipate post-grant validity challenges when pursuing litigation.

For related case law, explore the USPTO Patent Center for U.S. Patent No. 10,690,336, and review PTAB proceedings via PTAB E2E. Case filings are accessible through PACER under Case No. 2:23-cv-07470.