Counsel registry
Parker, Bunt & Ainsworth
30 case appearances — 22 as plaintiff counsel · 8 as defendant counsel.
Firm overview
As of May 1, 2026
Professional Summary: Parker, Bunt & Ainsworth, P.C.
Parker, Bunt & Ainsworth, P.C. is a boutique litigation firm headquartered in Tyler, Texas. Founded in 2002 by the late Robert M. Parker, a former federal judge for the U.S. District Court for the Eastern District of Texas and the U.S. Court of Appeals for the Fifth Circuit, the firm leverages its deep local expertise in the East Texas federal courts. It is recognized regionally, holding a Tier 1 ranking for Patent Litigation in Tyler from Best Law Firms. The firm is led by partners Robert C. "Chris" Bunt and Charles L. Ainsworth.
The firm's intellectual property practice has a particular focus on patent litigation. Parker, Bunt & Ainsworth represents clients in disputes involving a wide array of technologies, including semiconductors, software, medical devices, and oil and gas equipment. The firm's website states that it represents both plaintiffs and defendants. Its most recent tracked patent case appearance was on behalf of the plaintiff, Semantic Engines LLC, serving as local counsel in a software patent suit against Microsoft.
In its most prominent recent matter, Semantic Engines LLC v. Microsoft Corp., filed in April 2026 in the Eastern District of Texas, the firm is serving as local counsel for the plaintiff. The case involves patents related to artificial intelligence and multi-document search technology asserted against Microsoft's Copilot AI assistant. There is no publicly available information indicating that the firm maintains a significant appellate practice before the Federal Circuit or a high-volume IPR practice before the Patent Trial and Appeal Board.
Attorneys
Roles
- local counsel25
- of counsel4
- lead counsel4
- Local Counsel4
- Of Counsel3
- Lead Counsel3
- Lead/Local Counsel2
- Counsel2
- of counsel / local counsel1
- counsel1
Cases (30)
- π plaintiffABC IP, LLC et al. v. MaRs Trigger, LLC et al.Charles Ainsworth · local counsel
- π plaintiffAlpha Modus Corp v. Circle K Stores IncChristopher P. Hanba · local counsel
- π plaintiffAlpha Modus Corp. v. Best Buy Co., Inc.Robert M. Parker · local counsel
- π plaintiffAutonavigare LLC v. Toyota Motor Corporation et al.Charles Ainsworth · Local Counsel
- π plaintiffAutonavigare LLC v. Volkswagen Group of America, Inc.Charles L. "Chip" Ainsworth · Lead Counsel
- Δ defendantCyberfone Systems, LLC v. AT&T Inc. et al.Robert C. Bunt · lead counsel
- π plaintiffCyberfone Systems, LLC v. Discover Financial Services, Inc.Robert Christopher Bunt · Lead/Local Counsel
- π plaintiffDataTreasury Corporation v. Bank of AmericaCharles Ainsworth · local counsel
- π plaintiffDataTreasury Corporation v. Bank of America CorporationRoderick R. R. Phelan · Lead Counsel
- Δ defendantDataTreasury Corporation v. Jack Henry & Associates, Inc.Robert M. Parker · Local Counsel
- Δ defendantDataTreasury Corporation v. JPMorgan Chase & Co. et al.Robert M. Parker · local counsel
- Δ defendantDataTreasury Corporation v. U.S. Bank et al.Robert M. Parker · lead counsel
- π plaintiffEXPRESS MOBILE, INC. v. YETI Coolers, LLCCharles Ainsworth · local counsel
- Δ defendantFleet Connect Solutions LLC v. Toyota Motor North America, Inc.Robert C. 'Chris' Bunt · local counsel
- π plaintiffGreenthread, LLC v. STMicroelectronics, Inc.Charles L. "Chip" Ainsworth · local counsel
- π plaintiffIntent IQ, LLC v. Google LLCRobert P. Parker · of counsel
- π plaintiffMarshall Feature Recognition, LLC et al. v. Amazon.com, Inc.Robert M. Parker · lead counsel
- π plaintiffMultimedia Technologies Pte Ltd v. LG Electronics IncRobert M. Parker · Of Counsel
- π plaintiffMultimedia Technologies Pte Ltd. v. Fandango Media, LLCRobert Christopher Bunt · Local Counsel
- Δ defendantOrthosie Systems, LLC v. Spireon, Inc.Robert C. Bunt · local counsel
- π plaintiffPersonal Audio LLC v. Apple Inc.Steve M. Bunt · local counsel
- Δ defendantSampo IP, LLC v. Ambit Energy Holdings, LLC et al.Robert M. Parker · Counsel
- π plaintiffSemantic Engines LLC v. Microsoft CorpRobert M. Parker · local counsel
- π plaintiffUniloc USA, Inc. et al. v. Sony Corporation of America et al.Robert M. Parker · of counsel
- Δ defendantUniloc USA, Inc. et al. v. Sony Corporation of America et al.Charles Ainsworth · local counsel
- π plaintiffVB Assets, LLC v. Samsung Electronics Co., Ltd.Charles Ainsworth · Local Counsel
- π plaintiffVirnetX Inc. v. Apple Inc.Robert M. Parker · counsel
- π plaintiffVirnetX Inc. v. Microsoft CorporationRobert M. Parker · of counsel / local counsel
- π plaintiffVision Works IP Corp. v. Tesla, Inc.Robert M. Parker · local counsel
- π plaintiffX One, Inc. v. Uber Technologies, Inc.Charles Ainsworth