Sean M. Casey

Specialty / focus. Sean M. Casey is a Boston-based associate at Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C., whose practice centers on patent litigation before federal district courts, the ITC, and the PTAB, with supporting work in strategic IP counseling and patent valuation (per his firm bio). His technology mix spans semiconductors and FINFET manufacturing, graphics processors, RF/wireless and telecommunication systems, software and voice/speech-recognition systems, plus mechanical-ish products such as parking meters, drones, and medical flocked swabs. He came to law from computer science — prior software-engineering work on distributed direction-finding/geolocation systems and graduate research at UMass Lowell on wireless sensor networks (firm bio; The Org).

Side preference. All 10 tracked appearances are on the plaintiff/patent-owner side, and every one involves the same client: Parus Holdings, Inc., a voice-browsing and speech-recognition patent monetization company, in W.D. Tex. and related actions against Apple, Google, Microsoft, and Samsung (Casey appeared as trial counsel, counsel, of counsel, co-counsel, and — via Ward, Smith & Hill — local counsel/pro hac vice). His broader Mintz practice, however, is two-sided: he has defended operating companies (SkySail on a § 101 dismissal affirmed at the Federal Circuit; Spin Master, which won a dismissal with prejudice; Civicsmart/Duncan Parking), represented ITC complainants including AMD and GlobalFoundries, and served as IPR petitioner's counsel for Shopify.

Firm context and notable matters. Casey's tracked career is split between Mintz (8 appearances) and the Longview, Texas trial firm Ward, Smith & Hill (2 appearances), the latter known for East Texas patent trials including the VirnetX v. Apple verdicts. The most prominent tracked matter is the Parus campaign against Apple, Google, Microsoft, and Samsung over "robust voice browser" patents. In the related appellate proceeding, Parus Holdings, Inc. v. Google LLC, 70 F.4th 1365 (Fed. Cir. 2023), the Federal Circuit issued a precedential affirmance of PTAB decisions invalidating two Parus patents as obvious — a loss for Casey's client. He also defended Parus against Apple-filed IPRs (IPR2020-00686/-00687), where the PTAB rejected Apple's challenges. Notable wins elsewhere include the AMD ITC investigation (337-TA-1044), which ended in exclusion orders against VIZIO, MediaTek, and Sigma Designs, and the Shopify/DDR IPRs later affirmed on appeal. Post-script: Mintz's Parus engagement ended in litigation, with Mintz suing Parus for unpaid success fees and Parus counter-suing for malpractice (2025), though Casey is not named in the malpractice suit.

PTAB / IPR experience. Substantial and recurring: PTAB defense for Parus, petitioner-side work for Shopify, and published guidance on patent-owner IPR strategy (IPR depositions, motions to amend, rehearing practice) — PTAB/IPR work is a core part of his practice rather than an outlier.

Bar / education. Registered to practice before the USPTO (Reg. No. 71430); firm bio cites a computer science background with graduate research at UMass Lowell, but his state bar admission was not independently verified in available sources.