Cellspin Soft, Inc. v. ByteDance Ltd. et al.

Cellspin Soft, Inc. initiated a patent infringement lawsuit against ByteDance Ltd., ByteDance Pte. Ltd., and TikTok Pte. Ltd. in the Eastern District of Texas. The plaintiff, Cellspin Soft, Inc., operates as a Non-Practicing Entity (NPE) or Patent Assertion Entity (PAE), a common characteristic given its self-description as a "Silicon Valley Start-up that acquired patents" and its history of IP enforcement, including against other major technology companies like Fitbit and Garmin. The defendants, ByteDance Ltd. (a Chinese corporation), ByteDance Pte. Ltd. (a Singapore corporation), and TikTok Pte. Ltd. (a Singapore corporation), are collectively referred to as "TikTok" in the litigation and are operating companies behind the popular social media platform.

The core of the dispute centers on allegations that TikTok's services infringe upon Cellspin Soft's patents related to publishing multimedia content using Bluetooth-enabled mobile devices. Specifically, U.S. Patent 8,904,030, along with six other patents, is asserted in the lawsuit. Patent 8,904,030 broadly covers a method for transferring data from a capturing device to a mobile device via Bluetooth for subsequent upload to a remote server, where the capturing device can notify the mobile device of new data availability. The accused technology encompasses TikTok's functionality, particularly its handling of user-generated multimedia content, which Cellspin Soft alleges involves these patented methods, including aspects related to TikTok's backend infrastructure and data handling within the U.S., notably referenced in discovery motions related to "Project Texas".

The case is proceeding in the U.S. District Court for the Eastern District of Texas, presided over by District Judge Rodney Gilstrap and referred to Magistrate Judge Roy S. Payne. This venue is notable for its historical popularity among patent plaintiffs, including NPEs, due to its reputation for plaintiff-friendly procedures, experienced patent judges, and relatively swift time to trial. Although patent filings in EDTX saw a decline after the TC Heartland Supreme Court decision, the district has recently experienced a resurgence as a leading forum for patent litigation. The litigation is further distinguished by parallel inter partes review (IPR) proceedings initiated by TikTok against Cellspin Soft's asserted patents, where TikTok is challenging the validity of the patents at the Patent Trial and Appeal Board (PTAB). The PTAB recently denied Cellspin Soft's attempts to terminate these IPRs, rejecting arguments that the Chinese Communist Party (CCP) was an undisclosed real-party-in-interest and that TikTok, as a sovereign-controlled entity, was ineligible to file IPRs. This IPR linkage and the broader implications of TikTok's "Project Texas" in the context of U.S. national security concerns add layers of complexity and noteworthiness to the case.

The patent infringement lawsuit, Cellspin Soft, Inc. v. ByteDance Ltd. et al. (2:23-cv-00496), in the Texas Eastern District Court, concerns alleged infringement of US patent 8904030. The case has seen several key developments since its filing.

Filing & Initial Pleadings:
Cellspin Soft, Inc. initiated the lawsuit on October 20, 2023, against ByteDance Ltd., ByteDance Pte. Ltd., and TikTok Pte. Ltd.. The original complaint asserted patent infringement, including allegations of willful infringement, and sought enhanced damages. While the specific dates for the defendants' answer and any counterclaims are not readily available in the provided search results, such pleadings would have been filed for the case to progress to the subsequent stages.

Pre-trial Motions & Claim Construction (Markman):
A significant pre-trial development occurred when the court issued a Markman Order on January 26, 2025 (Dkt. No. 106). Following this Markman order, the district court case was stayed pending the outcome of related inter partes review (IPR) proceedings at the Patent Trial and Appeal Board (PTAB) on the same date, January 26, 2025 (Dkt. No. 106). This aligns with the noted practice of Judge Gilstrap, who "routinely grants contested stays in circumstances when all asserted claims of all asserted patents are challenged in the instituted IPRs".

Discovery Milestones:
No specific strategic discovery milestones for this particular case were identified in the available information.

Trial Events, Verdict, and Post-Trial Motions:
As the district court case is currently stayed, it has not reached the trial stage, and therefore, no verdict or post-trial motions have occurred.

Settlement, Dismissal, Judgment, or Appeal:
The case remains open and is currently stayed, so there has been no final disposition via settlement, dismissal, judgment, or appeal.

Parallel PTAB IPR/PGR Proceedings:
Several IPR petitions were filed by TikTok Inc. and related ByteDance entities against patents owned by Cellspin Soft, Inc. that were asserted in the broader litigation, although none of the available search results explicitly indicate an IPR specifically challenging US Patent 8904030. The identified IPRs include:

• IPR2024-00757 (for US Patent 8,756,336 B2)
• IPR2024-00759 (for US Patent 8,862,757 B2)
• IPR2024-00760 (for US Patent 8,898,260 B2)

These IPRs were initially instituted by the PTAB. However, on June 5, 2025, the Director of the USPTO initiated a sua sponte Director Review of these institution decisions, staying the IPR proceedings. Subsequently, on March 30, 2026, the Director issued an order vacating the PTAB's decisions to institute the "Cellspin Soft IPRs" (including IPR2024-00757, IPR2024-00759, IPR2024-00760, and others). The Director's decision to vacate was based on TikTok Inc.'s failure to demonstrate that a foreign government was not a real party in interest (RPI) at the time the petitions were filed, citing the precedential Tianma Microelectronics Co. v. LG Display Co. decision. This outcome means these IPRs were effectively terminated without a decision on the merits of the challenged patents. The vacating of the IPRs could lead to the lifting or reconsideration of the stay in the district court case, allowing the litigation to proceed.

Based on available information, the following attorneys from Garteiser Honea PLLC are representing the plaintiff, Cellspin Soft, Inc., in this patent infringement case. Garteiser Honea PLLC describes itself as a litigation boutique handling complex intellectual property disputes as lead counsel, with particular familiarity with federal and state courts in East Texas and Northern California, suggesting they often serve in a lead and/or local counsel capacity. The firm's main office relevant to this Eastern District of Texas case is in Tyler, Texas.

Here is the identified counsel for the plaintiff:

• Randall T. Garteiser

  • Role: Partner (Lead Counsel)
  • Firm: Garteiser Honea PLLC, Tyler, Texas. The firm also has an office in San Francisco.
  • Experience Note: A trial attorney with experience from Quinn Emanuel in Silicon Valley, he has litigated cases for clients involving smartphones, tablets, Chromebooks, dielectric fluids, and software. He clerked for the Honorable James Ware in the U.S. District Court for the Northern District of California and is licensed in California and Texas. He is listed among leading patent attorneys by the number of US District Court cases handled.

• Christopher Honea

  • Role: Partner (Lead Counsel)
  • Firm: Garteiser Honea PLLC, Tyler, Texas.
  • Experience Note: Co-chairs the firm's Intellectual Property Litigation Group and has extensive experience in patent, trademark, trade secret, and copyright litigation. He previously worked at McKool Smith, notably representing i4i, Inc. in a patent infringement action against Microsoft that resulted in a significant award. He also worked at Quinn Emanuel and has in-house counsel experience. He is listed among leading patent attorneys by the number of US District Court cases handled.

• M. Scott Fuller

  • Role: Partner (Lead Counsel)
  • Firm: Garteiser Honea PLLC, Tyler, Texas.
  • Experience Note: A patent litigator with experience representing both plaintiffs and Fortune 500 defendants (e.g., Microsoft, Huawei, HSBC, Citigroup) in complex cases across the U.S., involving a wide range of technologies. He is a former registered professional structural engineer and is registered to practice before the USPTO. He was previously a partner and co-chair of the Texas IP Litigation Practice Group at Locke Lord LLP. He is listed among leading patent attorneys by the number of US District Court cases handled.

Garteiser Honea PLLC has explicitly represented Cellspin Soft, Inc. in "Cellspin cases," and the firm generally handles complex IP litigation as lead counsel. While a specific docket entry directly listing all counsel for 2:23-cv-00496 was not retrieved through web search, these attorneys and their firm are strongly associated with Cellspin Soft, Inc.'s patent litigation efforts, particularly in the Eastern District of Texas.

Defendant ByteDance Ltd., ByteDance Pte. Ltd., and TikTok Pte. Ltd. are represented by counsel from Fish & Richardson P.C. and Gillam & Smith, LLP.

Here's a breakdown of the counsel of record:

Fish & Richardson P.C.

• Ruffin B. Cordell - Lead Counsel.
  • Office: Washington D.C.
  • Experience: Known for extensive patent litigation, particularly for technology and telecommunications clients.
• Ricardo Joel Bonilla - Counsel.
  • Office: Dallas, Texas.
  • Experience: Focuses on patent litigation and other intellectual property disputes.
• Adil A. Shaikh - Counsel.
  • Office: Dallas, Texas.
  • Experience: Specializes in patent litigation across various technologies.
• David Brandon Conrad - Counsel.
  • Office: Dallas, Texas.
  • Experience: Handles patent infringement cases and other complex commercial litigation.
• Noel Franco Chakkalakal - Counsel.
  • Office: Dallas, Texas.
  • Experience: Practices in intellectual property litigation, including patent and trade secret disputes.

Gillam & Smith, LLP

• Melissa Richards Smith - Local Counsel.
  • Office: Tyler, Texas.
  • Experience: A prominent local counsel in the Eastern District of Texas, frequently involved in high-stakes patent cases in the district.