Modulus Systems LLC v. Sengled Co Ltd

Case Overview and Background

In a recent wave of patent litigation, Modulus Systems LLC, a Delaware-based entity, has filed a lawsuit against Sengled Co Ltd, a global technology company specializing in smart lighting solutions. The complaint, filed on April 22, 2026, alleges that Sengled's radio frequency modules, integral to their smart lighting products, infringe on Modulus's patent. This case is part of a broader assertion campaign by Modulus, which filed several similar lawsuits against other technology companies on the same day, all asserting the same patent. The lawsuits were all filed in the U.S. District Court for the Eastern District of Texas and have been assigned to Chief Judge Rodney Gilstrap, a prominent figure in patent litigation.

The plaintiff, Modulus Systems LLC, appears to be a non-practicing entity (NPE), as evidence suggests a pattern of litigation with no indication of offering products or services. The defendant, Sengled Co Ltd, is a manufacturer of smart lighting products, including LED bulbs with integrated smart features and connectivity options that work with various smart home platforms. The allegedly infringing products are Sengled's radio frequency modules and their methods for wirelessly transmitting and receiving data, which are fundamental to the "smart" functionality of their lighting systems. The core of the dispute is U.S. Patent No. 8,610,573, titled "Radio frequency module and methods of transmitting/receiving data." The patent, issued in 2013, addresses challenges in designing compact and efficient wireless devices, particularly mitigating interference in the crowded 2.4 GHz frequency band where technologies like Wi-Fi operate.

The case's venue in the Eastern District of Texas before Judge Gilstrap is highly significant. This court has a reputation for being a favored jurisdiction for patent plaintiffs due to its expedited trial schedules, known as the "rocket docket," and procedural rules often seen as plaintiff-friendly. Judge Gilstrap is one of the most active patent judges in the country, presiding over a substantial percentage of all U.S. patent cases. This concentration of patent cases makes his courtroom a key battleground for high-stakes intellectual property disputes. The case is also notable in the context of Sengled's recent business challenges, which have included other patent infringement lawsuits and reported financial difficulties. This litigation campaign by Modulus highlights a continuing trend of NPEs targeting the high-tech industry, particularly companies involved in the Internet of Things (IoT) and smart home device sectors.

Following the filing of the lawsuit on April 22, 2026, the case has moved through the initial procedural stages. As of May 1, 2026, the litigation is in its infancy, and no substantive rulings have been issued.

Key Legal Developments Chronology

• 2026-04-22: Complaint Filed
  Modulus Systems LLC filed its complaint against Sengled Co Ltd, alleging infringement of U.S. Patent No. 8,610,573. The complaint accuses Sengled's smart lighting products, which utilize radio frequency modules for wireless communication, of infringing the patent. The case was assigned to Chief Judge Rodney Gilstrap. (Case Filing, Modulus Systems LLC v. Sengled Co Ltd, No. 2:26-cv-00331 (E.D. Tex. Apr. 22, 2026), ECF No. 1).

• 2026-04-22: Other Lawsuits Filed
  On the same day, Modulus Systems LLC filed nearly identical lawsuits against several other companies in the Eastern District of Texas, all asserting infringement of the '573 patent. These parallel cases target companies in the smart home and wireless device sectors, indicating a coordinated litigation campaign. Other defendants include companies like GE Lighting (Savant Systems Inc.) and Wyze Labs, Inc.

• 2026-04-24: Summons Issued
  A summons was issued to the defendant, Sengled Co Ltd, formally notifying the company of the lawsuit and setting a deadline for a response. (Summons Issued, Modulus Systems LLC v. Sengled Co Ltd, No. 2:26-cv-00331 (E.D. Tex. Apr. 24, 2026), ECF No. 6).

Pending Actions and Outlook

As of this date, the docket does not yet show that Sengled has been formally served or has entered an appearance through counsel. The next steps will involve Sengled filing an answer to the complaint or, alternatively, filing pre-answer motions, such as a motion to dismiss under Rule 12(b)(6) for failure to state a claim or a motion to transfer venue.

Given the nature of the parties and the asserted patent, several developments can be anticipated:

• Motion to Transfer Venue: Sengled, a company with operations outside of the Eastern District of Texas, may challenge the venue, arguing that the case should be heard in a more convenient forum.
• PTAB Challenge: It is highly probable that Sengled, either alone or jointly with other defendants in the parallel cases, will file a petition for inter partes review (IPR) with the Patent Trial and Appeal Board (PTAB) to challenge the validity of the '573 patent. An IPR filing would likely be followed by a motion to stay the district court case pending the PTAB's decision. As of May 1, 2026, no such IPR petitions appear to have been filed against the '573 patent, but the deadline for the patent owner's preliminary response has not yet passed in a potential IPR.
• Early Settlement: Many lawsuits of this type, brought by non-practicing entities, are resolved through early settlement to avoid the high costs of litigation. The ultimate outcome may depend on Sengled's assessment of the patent's strength and its own financial position.

The case is still in its earliest stages, and no substantive legal rulings have been made.

Plaintiff's Counsel of Record

Based on a review of the court docket and other publicly available information, the plaintiff Modulus Systems LLC is represented by the following counsel.

Isaac Phillip Rabicoff

• Role: Lead Counsel
• Firm: Rabicoff Law LLC (Chicago, Illinois)
• Note on Experience: Mr. Rabicoff is the founder of his firm and has represented plaintiffs in numerous patent infringement campaigns across the country, including in the Eastern District of Texas. His firm was listed by Lex Machina as one of the most active in patent litigation in 2017, and he has led licensing campaigns against major technology companies such as Apple, Amazon, Google, and Microsoft.

As of May 1, 2026, the docket for Modulus Systems LLC v. Sengled Co Ltd, 2:26-cv-00331, confirms that Isaac Rabicoff filed the initial complaint and a notice of appearance on behalf of the plaintiff. He is also listed as counsel for Modulus Systems LLC in several other lawsuits filed on the same day, asserting the same patent against different defendants. There are no other attorneys currently listed as having appeared for the plaintiff in this specific case.

Defendant's Counsel of Record

As of May 1, 2026, a review of the official court docket for Modulus Systems LLC v. Sengled Co Ltd, 2:26-cv-00331 (E.D. Tex.), indicates that no attorney has formally filed a notice of appearance on behalf of the defendant, Sengled Co Ltd.

The case was filed on April 22, 2026, and a summons was issued to Sengled two days later. Typically, under the Federal Rules of Civil Procedure, a defendant has 21 days to file an answer or other responsive pleading after being served. Given the short time that has elapsed since the case was initiated, it is not unusual that counsel has yet to formally appear on the docket. This section will be updated as soon as counsel for the defense makes an appearance in the case.