Antonio R. Sistos

Antonio R. Sistos — Patent Litigation Practice Summary

Focus areas and firm. Sistos is a patent litigation attorney in the San Francisco office of Quinn Emanuel Urquhart & Sullivan LLP (the firm was formerly Quinn Emanuel Urquhart Oliver & Hedges; his earliest appearances in the public record date to roughly 2009–2010, when filings identify him as a QE associate). His work concentrates on software and high-technology disputes: data security and encryption (Security First Innovations), storage/data-transmission networking technology (the Alacritech matters), online search, advertising and web services (Polaris IP/Bright Response, Priceplay, Rockstar Consortium, Impact Engine), and audio/media software (Personal Audio). A secondary directory-sourced practice description confirms patent litigation "particularly relating to software and high tech matters," including federal district court and ITC proceedings and USPTO reexamination work; that description is not independently corroborated by a firm-published bio, so treat it as indicative rather than authoritative.

Side preference. The tracked data (0 plaintiff / 1 defendant) reflects only the Security First Innovations matter, but the broader public record shows a predominantly defense-side practice centered on Google, which he has represented in district courts across the N.D. Cal., E.D. Tex., S.D. Cal., and D. Del. The one clear exception is Alacritech, Inc., a patent-assertion entity for which he served as patent-owner counsel in both district court litigation and PTAB proceedings — i.e., the plaintiff/patent-holder side. So: defense-leaning, but not exclusively so.

Notable cases and outcomes. The most prominent matters the public record ties to him involve Google: Personal Audio LLC v. Google LLC (D. Del. No. 1:17-cv-01751), where he was on the QE trial team that obtained a June 2023 jury verdict of $15.1 million against Google; that verdict was vacated on post-trial JMOL in September 2023 on sufficiency-of-evidence grounds and the Federal Circuit declined to revive it in June 2025 — a net defense win for his client. He also appeared for Google in Rockstar Consortium US LP v. Google (E.D. Tex.), the Bedrock Computer Technologies MDL-style litigation, and Polaris IP/Bright Response v. Google, and in the EMC–Bright Response declaratory judgment action. The single tracked case, Security First Innovations, LLC v. Google LLC (E.D. Va. No. 2:23-cv-97), is an NPE suit targeting Google Cloud Storage encryption-at-rest and Google Drive; he is listed as trial counsel for Google, and the case has been stayed pending IPR of the asserted data-security patents.

PTAB / IPR. He does not appear to be a registered practitioner who regularly leads PTAB work. His documented PTAB activity is a series of 2018 pro hac vice admissions as patent-owner counsel for Alacritech in Alacritech v. Dell-related IPRs (IPR2017-01393, -01406, -01409), where his own declaration noted it was his first appearance before the Board. In the Security First Innovations IPRs (IPR2024-00213/-00214/-00215), Google's PTAB filings were handled by different counsel (Wolf, Greenfield & Sacks), suggesting his role there is district-court focused.

Bar and education. Admitted to the California State Bar (No. 238847) and the U.S. District Court for the Northern District of California, with pro hac vice admissions in the Eastern District of Texas and the PTAB. Directory listings indicate a J.D. from Harvard Law School (cum laude, 2005) and M.S./B.S. degrees in industrial engineering from Stanford; these credentials come from a third-party directory rather than a firm bio and should be verified before reliance.

Note on scope: the authoritative case list contains a single tracked appearance, but public court filings show a materially larger docket over roughly fifteen years, almost all of it on the defense side for Google.