Austin C. Diehl

I'll research this attorney before drafting.

Austin C. Diehl — professional summary

Focus areas. Diehl is an associate at Stinson LLP in St. Louis whose practice is primarily general commercial litigation — business torts, breach of contract, securities and fiduciary-duty claims, real estate, and arbitration — with an intellectual-property component. Stinson's own biography describes his IP work as brand protection and infringement disputes: trademark and patent enforcement, cease-and-desist and other pre-suit efforts, TTAB expungement/cancellation proceedings, and UDRP domain disputes. His only tracked patent-related appearance is adverse to Competitive Access Systems, Inc. ("CAS"), a Texas patent owner (founded by inventor Eric Delangis) whose asserted portfolio covers network/telecommunications technologies, including multilink and broadband access protocols — i.e., the technical subject matter in his tracked matters is telecom/networking rather than pharma, mechanical, or Wi-Fi-standards litigation. His published experience does not yet reflect a defined technical specialty; his undergraduate degree is in mathematics and sociology, not engineering.

Side preference. His tracked record shows a single appearance on the defense/respondent side (0 plaintiff, 1 defendant), consistent with the pattern of his firm's work for CAS, where Stinson serves as counsel to the patent owner resisting infringement and validity challenges. There is no tracked or publicly reported representation of an NPE/PAE plaintiff or of a plaintiff-side patent assertion.

Firm context. Diehl has been at Stinson since law school: he was a 2022 summer associate and joined the firm's Litigation Associates Group in St. Louis in November 2023 (announced by University of Illinois College of Law class notes, Dec. 2023). No prior law-firm or in-house patent litigation employers are disclosed. He is part of the Stinson team — led by John R. Schroeder, with B. Scott Eidson, Timothy Krieger, Zachary Buchheit, Julie Meglan, and Judith Araujo — that represents CAS against Red Hat, Inc.

Notable matters and outcomes. The tracked case, Undisclosed Petitioner v. Competitive Access Systems Inc., is a proceeding in which he appeared as counsel for CAS as the responding party. The surrounding CAS campaign is well documented: CAS asserted patents against Oracle (settled, with related IPRs terminated in fall 2023), and Stinson is defending CAS in Red Hat's E.D.N.C. action (including Red Hat's claims under North Carolina's Abusive Patent Assertions Act) and in Red Hat's August 2025 IPR petitions covering at least seven CAS patents (IPR2025-01370, -01373, -01380, -01381, -01382, and related filings). CAS has also asserted patents against Apple (N.D. Cal. 2025) and Samsung/ Motorola (E.D. Tex. 2025), with stays granted in some of those cases. Caution: no publicly available source ties Diehl personally to a specific verdict, settlement, or Federal Circuit outcome — he does not appear on the public counsel listings for the Red Hat IPRs, so his role appears to have been limited. A Law360 attorney page lists one further matter under his name (MSR Technology Group, LLC v. VistalTech, Inc. et al, N.D. Ill., filed April 22, 2024), docketed as a contract/insurance dispute rather than a patent case.

PTAB/IPR experience and credentials. He is not a registered patent practitioner and does not appear among the counsel of record on the publicly filed IPR papers in the CAS matters, so his PTAB exposure is best characterized as supporting rather than lead experience. Bar admissions: Missouri, 2023, and U.S. District Court for the Eastern District of Missouri, 2023. Education: University of Illinois College of Law, J.D., summa cum laude, 2023 (Illinois Law Review; Order of the Coif); Kenyon College, B.A., 2020. Given his 2023 admission, his patent litigation record is early-career and thin; any assessment of specialization should be revisited as his docket develops.