Patent assignments recently made public suggest another direct pickup for a New York-based investment management firm, this time through a familiar pipeline; movement of a search technology portfolio to a Delaware entity; and more patents filling out an apparent divestiture of a networking portfolio previously reported.

Texas entity SiliconArts Technology US Inc. has initiated what appears to be its first litigation. In separate Western District of Texas complaints, the Intellectual Discovery Co., Ltd. (ID) subsidiary accuses BOXX Technologies (1:25-cv-00400) and NVIDIA (1:25-cv-00431) of infringing a single US patent generally related to a certain “ray tracing core” through the provision of specified graphics processing units (GPUs).

In a new Eastern District of Texas complaint, Lemko Corporation has accused AT&T (AT&T Mobility and other subsidiaries) (2:25-cv-00305) of infringing seven patents broadly directed to various aspects of network communications. Targeted is the provision of the AT&T Private Edge 5G Network platform, as well as the AT&T Private Mobile Connection service. Lemko began this campaign with a February 2022 suit against Microsoft (Affirmed Networks) in the Northern District of Texas—a case that has remained mired in the pleadings phase more than three years later.

Pegasus Wireless Innovation LLC has filed a second complaint against each of AT&T (AT&T Mobility, Cricket Wireless, New Cingular Wireless PCS) (2:25-cv-00290), Deutsche Telekom (Sprint, T-Mobile) (2:25-cv-00289), and Verizon (TracFone Wireless, Verizon Wireless) (2:25-cv-00288), here targeting the provision of their respective mobile networks and related base stations, as well as the sale of related devices (e.g., smartphones, including those manufactured by Alphabet (Google) or Motorola), that operate in accordance with the 3GPP 4G/LTE and 5G Standards. Both Ericsson and Nokia have intervened in the first round of suits against the US wireless carriers. A claim construction hearing was held there on March 13, 2025, but the litigation to date has otherwise focused on the relationship between Pegasus Wireless and third-party defendant KT, the source of the patents-in-suit.

This past January, IPValue Management (d/b/a IPValue) and “intellectual property and technology licensing company” Longitude Flash Memory Solutions Ltd. (LFMS) filed a Central District of California complaint against Western Digital (8:25-cv-00119). There, the plaintiffs target the provision of a wide array of devices (e.g., embedded flash, HDDs, SSDs, USB flash drives, and memory cards) that contain 3D NAND flash memory. On February 24, 2025, Sandisk spun out of Western Digital and has now filed a Northern District of California complaint against IPValue and LFMS (5:25-cv-02389), indicating that the products identified in the earlier complaint against Western Digital are Sandisk’s.

Last September, Arlington Technologies, LLC, a Dominion Harbor Enterprises, LLC plaintiff, filed its first litigation over a large portfolio of former Avaya patents received earlier in 2024, suing Comcast in a pair of Eastern District of Texas complaints. Those cases have ended, after a notice of settlement. Now, Arlington has filed against Deutsche Telekom (Sprint, T-Mobile) (2:25-cv-00279) in the same district. Targeted is the provision of “wireless access points” that are configured to support 802.11ax and Wi-Fi Multimedia, cellular services that support Voice over LTE (VoLTE), and cellular networks that support STIR/SHAKEN call verification.

Last month, Estech Systems IP LLC sued United Web (Nextiva) (3:25-cv-00299) in the Northern District of Texas, following that suit with cases this month against Panasonic (2:25-cv-00258) in the Eastern District of Texas and VTech (1:25-cv-00333) in the Western District of Texas. The asserted patents broadly concern various aspects of Voice over IP (VoIP), including call quality monitoring, voicemail systems, and phone directories. Estech Systems IP, a Texas entity itself, moved to proceed without local counsel, as required; that motion, as is routine, was denied. Charhon Callahan Robson & Garza, PLLC has since made an appearance but has yet to correct the plaintiff’s failure to comply with the local rule there imposing heightened disclosure on litigants.

Vision Sphere Labs LLC has added two Western District of Texas suits—one against each of Lantronix (1:25-cv-00334) and Rubicon Communications (1:25-cv-00332)—to the campaign that it started last fall with separate Eastern District of Texas cases against Grandstream Networks and Firewalla and expanded earlier this year against Perle Systems and FS.com in the same district. Targeted throughout has been the provision of routers, switches, and platforms that support certain QoS (“Quality of Service”) features.

Eastern District of Texas Magistrate Judge Roy S. Payne last week recommended denial of a motion to dismiss the complaint filed by DigitalDoors, Inc. against Frost Bank for inadequate pleading. Clarifying that it is not making a “standard-essential argument” concerning the patents asserted in this campaign, the plaintiff targets “interconnected storage systems” that “operate as a single controlled apparatus to provide secure data vaulting . . . as specified by Sheltered Harbor or its operational equivalent”. The day of the court’s report, DigitalDoors filed new complaints in the Western District of Texas, one against each of Amarillo National Bank (7:25-cv-00102), Broadway Bancshares (7:25-cv-00103), International Bancshares (Commerce Bank) (7:25-cv-00105), Northern Trust (7:25-cv-00106), Pinnacle Bank (7:25-cv-00107), South Plains Financial (City Bank Texas) (7:25-cv-00104), Texas Capital Bancshares (Texas Capital Bank) (7:25-cv-00108), US Bancorp (WestStar Bank) (7:25-cv-00110), VBT Financial (Vantage Bank Texas) (7:25-cv-00109), and Western Alliance Bank (Alliance Association Bank, Bank of Nevada, Bridge Bank, First Independent Bank, Torrey Pines Bank) (7:25-cv-00111).

Through multiple August 2021 assignments, HANNIBAL IP LLC received 35 US patents, together with foreign counterparts, from FG Innovation Company Ltd. (f/k/a FG IP Innovation Company Ltd.) (FGI). It has now filed its first US suit over those assets, accusing Samsung (4:25-cv-00200) in an Eastern District of Texas complaint of infringing four of them. The asserted patents, broadly directed to wireless communications, are described as “essential to practicing the 3GPP 5G Standard”, with the provision of Galaxy-series smartphones that support that standard in the crosshairs. HANNIBAL IP, a Longhorn IP LLC plaintiff, pleads that the alleged infringement has been willful, indicating that it sent a notice letter to Samsung as early as June 2022.