Mann Law

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Law Firm Patent Litigation Profile — "Mann Law"

Identification and firm overview. Based on the tracked partner roster (J. Mark Mann, Elizabeth L. DeRieux, Jared E. Daniel), the practice captured here corresponds to the East Texas litigation practice of J. Mark Mann, operating as The Mann Firm / Mann Tindel Thompson and marketed as MT2 Law Group. HQ is 300 W. Main Street, Henderson, Texas, with additional Tyler (11 E. Line St., Ste. 304), Marshall and Waco offices shown on firm signature blocks in federal filings. This is a small regional general civil trial firm, not an IP boutique or BigLaw shop: the State Bar of Texas directory lists the firm at 2–5 lawyers, and I found no AmLaw 200 or Chambers IP ranking for it — its visibility is regional (EDTX/W.D. Tex.), not national. Its docket mix is generalist (intellectual property alongside personal injury, products liability, commercial, oil and gas, and probate), which is characteristic of a local-counsel/trial firm rather than a dedicated patent practice. (Note: at least one unrelated entity using a "Mann Law Group" name appears in patent dockets with Rabicoff Law; I could not fully reconcile the tracked "Mann Law" label against a public firm website, so this identification should be treated as probable rather than confirmed.)

IP litigation specialty. Public filings show a concentration in semiconductor/microelectronics patent disputes and general electronics/consumer-tech cases, plus heavy East Texas venue practice. Tracked matters: Greenthread (semiconductor fabrication/processing patents asserted against Intel, Dell and Dell Technologies, W.D. Tex. Waco, No. 6:22-cv-105-ADA) and the Longitude Licensing / Marlin Semiconductor assertion campaign over semiconductor patents, which produced ITC Investigation No. 337-TA-1443 (instituted March 26, 2025) and a cluster of IPRs against Marlin by TSMC and Apple. Other documented appearances in the same vein include Sony (E.D. Tex.), Alarm.com v. ipDatatel (S.D. Tex.), and NPE-side matters such as Fellowship Filtering Technologies v. Alibaba.com and Cedar Lane Technologies v. Alps Alpine North America (imaging-array patents). I found no evidence of pharma, Wi-Fi/SEP, or life-sciences work.

Side preference. The tracked record is a genuine 50/50 split — 1 plaintiff-side and 1 defendant-side appearance — and the broader docket confirms that: the firm has worked for patent-owner/NPE plaintiffs (Longitude/Marlin, Fellowship Filtering) and for operating-company defendants (Sony, ipDatatel, Alibaba). The recorded role in the Marlin matter is local counsel, consistent with the firm's profile as a venue-savvy East Texas firm that plugs into national lead counsel teams rather than a captive plaintiff or defense shop.

Notable cases and outcomes. The most prominent tracked matter is Greenthread, LLC v. Intel Corp., Dell Inc. & Dell Technologies Inc. (W.D. Tex. No. 6:22-cv-105-ADA), where Mann appeared on the defense side. That case generated substantial secondary litigation: onsemi filed IPR2023-01242/-01243/-01244 and a second wave (IPR2024-00263 through -00266), plus petitions by TI and Monolithic Power. Greenthread's § 315(b) privity/time-bar challenges failed in the first wave (Final Written Decision, IPR2023-01243, Feb. 19, 2025), though the Director granted Director Review in April 2025 and remanded for additional discovery on privity. In the Marlin Semiconductor matter, Mann served as local counsel in the plaintiff-side campaign; the companion PTAB proceedings (IPR2025-00847, -00848, -00864, -00865, -00879) were denied institution and referred to the Director on Sept. 3, 2025, followed by reports of a comprehensive TSMC settlement and motions to terminate. Separately, the firm appears in the signature block on filings in VLSI Technology LLC v. Intel Corp. (W.D. Tex. No. 1:19-cv-977-ADA) alongside Irell & Manella — a case widely reported as producing a multi-billion-dollar patent verdict later retried; I could not verify the firm's specific role at trial from available sources.

PTAB / IPR practice and key personnel. There is no publicly documented standalone IPR/PGR filing practice for this firm and no filing-volume data I could verify. In the Marlin IPRs, lead counsel of record is Mintz Levin (William A. Meunier, Adam S. Rizk, Michael T. Renaud); in the Greenthread IPR cluster the petitioners are onsemi, TI and others. The pattern suggests the firm's IPR exposure is supporting/local-counsel work. Key figures: J. Mark Mann (Best Lawyers in America, Litigation–Intellectual Property, Tyler, TX, since 2021; AV Preeminent; Fellow, American College of Trial Lawyers; board certified in personal injury trial law; past president of the American Board of Trial Advocates) is the practice anchor; G. Blake Thompson appears as firm counsel in patent filings; Andy Tindel appears as senior firm counsel on the VLSI filings. Two cautions on the tracked roster: Elizabeth L. DeRieux is of record as an attorney with Capshaw DeRieux LLP (Gladewater, TX) in filings alongside Mann, not as a Mann firm attorney, and I was unable to locate reliable public credentials for Jared E. Daniel — both should be verified before relying on them as firm personnel.

Sources: State Bar of Texas attorney directory (Bar No. 12926150); Best Lawyers firm/attorney profile; PTAB filings and decisions (IPR2025-00847/-00848/-00864/-00865/-00879, IPR2023-01242/-01243/-01244); ITC notice of institution, 337-TA-1443 (Mar. 26, 2025); CourtListener/docket filings in W.D. Tex. No. 1:19-cv-977-ADA and No. 6:22-cv-105-ADA; Law360 and Justia docket profiles. No AmLaw, Chambers, Vault or revenue/headcount figures were found for this firm, and none are asserted here.