Modulus Systems LLC v. Loytec Electronics GMBH

Case Overview: NPE Modulus Systems Asserts RF Module Patent Against Loytec in East Texas

On April 22, 2026, Modulus Systems LLC, a non-practicing entity (NPE), launched a new patent infringement lawsuit against Austrian building automation company Loytec Electronics GMBH. The case, filed in the U.S. District Court for the Eastern District of Texas, alleges that Loytec's radio frequency modules, which are used for wireless communication in building control systems, infringe on a single patent. This lawsuit is part of a broader assertion campaign by Modulus, which filed several other suits on the same day against various technology companies. The plaintiff, Modulus Systems, appears to be an entity focused on patent assertion, a common model for NPEs or Patent Assertion Entities (PAEs). The defendant, Loytec, is an operating company founded in 1999 that specializes in intelligent networked control products for building automation and was acquired by Delta Group in 2016.

The lawsuit centers on U.S. Patent No. 8,610,573, titled "Radio frequency module and methods of transmitting/receiving data". The patent, issued in 2013, generally discloses a compact, surface-mountable radio frequency (RF) module with a specific physical layout designed to reduce interference and optimize performance, particularly in the crowded 2.4 GHz frequency band. Modulus alleges that Loytec's products, which include wireless modules and devices for building management systems utilizing protocols like WLAN, BACnet, and EnOcean, incorporate this patented technology without a license. The accused products are broadly described as "radio frequency modules and the methods they use to transmit and receive data," which likely encompasses a range of Loytec's offerings that provide wireless connectivity.

The case has been assigned to Judge Rodney Gilstrap, the most active patent judge in the United States. The Eastern District of Texas has long been a favored venue for patent plaintiffs due to its experienced judiciary and local rules that can be perceived as favorable to patent holders. After a period where the Western District of Texas saw a surge in patent filings under Judge Alan Albright, rule changes in that district have led to a resurgence in the Eastern District's dominance, with Judge Gilstrap handling a significant percentage of all new patent cases nationwide. The case is notable as another example of a high-volume NPE filing campaign in a popular patent venue. The outcome could impact Loytec's ability to sell its wirelessly enabled building automation products in the U.S. and may signal the start of a new wave of infringement assertions from Modulus Systems against the broader high-tech industry.

Case Developments Remain in Early Stages

As of May 1, 2026, legal proceedings in Modulus Systems LLC v. Loytec Electronics GMBH are in their infancy. The docket shows only the initial filing events, and with the case being just over a week old, no substantive legal battles have yet taken place.

Chronological Case Events:

• 2026-04-22: Complaint Filed. Modulus Systems LLC filed its patent infringement complaint against Loytec Electronics GMBH in the U.S. District Court for the Eastern District of Texas. The complaint alleges that Loytec's radio frequency modules infringe on U.S. Patent No. 8,610,573. The case was assigned to Judge Rodney Gilstrap. This filing was one of several similar lawsuits filed by Modulus on the same day against different defendants, all asserting the same patent.
• Present Posture: The case is currently open and awaiting the defendant's response. Loytec Electronics GMBH has not yet filed an answer or any other responsive pleading to the complaint. There are no motions to dismiss, transfer, or stay pending on the docket. Similarly, there have been no parallel challenges filed at the Patent Trial and Appeal Board (PTAB) against the '573 patent according to available records. The litigation is proceeding, with the next likely step being the service of the complaint on the Austrian-based defendant and its subsequent appearance in court.

Plaintiff Modulus Systems Represented by Texas Patent Litigation Stalwarts

According to the initial complaint filed on April 22, 2026, plaintiff Modulus Systems LLC has retained counsel from two Texas-based law firms well-versed in patent assertion campaigns in the Eastern District of Texas. The legal team combines a firm known for handling high-volume patent litigation with one of the most established local firms in the district.

Plaintiff's Counsel of Record:

• Deron Dacus (Lead Counsel)

  • Firm: The Dacus Firm, P.C. (Tyler, TX)
  • Experience: Mr. Dacus has represented clients in over 1,000 patent cases in the Eastern District of Texas and has tried dozens to verdict.

• J. Wesley Hill (Local Counsel)

  • Firm: Ward, Smith & Hill, PLLC (Longview, TX)
  • Experience: A prominent East Texas trial lawyer, Mr. Hill has served as counsel in over 1100 cases, with extensive experience in patent litigation for both plaintiffs and defendants.

The selection of The Dacus Firm and Ward, Smith & Hill is characteristic for a non-practicing entity (NPE) like Modulus Systems launching a litigation campaign in this venue. The Dacus Firm has represented clients in hundreds of patent cases in the Eastern District, serving as both lead and local counsel. Ward, Smith & Hill is described as "a force to be reckoned with in the Eastern District of Texas" and has a national reputation for its work in high-stakes intellectual property trials, frequently serving as local counsel for major patent lawsuits. Wesley Hill, specifically, has deep roots in the district, having clerked for former Judge T. John Ward and chaired the court's Local Rules Advisory Committee. This combination of counsel provides Modulus Systems with both seasoned lead trial attorneys and unparalleled local expertise.

Defendant's Counsel Has Not Yet Appeared

As of May 1, 2026, counsel for the defendant, Loytec Electronics GMBH, has not yet filed a notice of appearance in the case. The court docket for Modulus Systems LLC v. Loytec Electronics GMBH, 2:26-cv-00330 (E.D. Tex.), which was initiated on April 22, 2026, does not list any attorneys representing the defendant.

Given that the defendant is a foreign corporation based in Austria, the process of formal service of the complaint can take an extended period. Typically, a defendant has 21 days to respond after being served, but international service under agreements like the Hague Convention can significantly prolong the timeline before a response is due and counsel officially appears.

No responsive pleadings, such as an answer or a motion to dismiss, have been filed by Loytec Electronics GMBH. The case remains in its preliminary stages, awaiting service of process on the defendant and its subsequent retention of U.S. counsel.