Elisabeth H. Hunt

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Elisabeth H. Hunt (Wolf, Greenfield & Sacks, P.C.) — Patent Litigation Practice Summary

Specialty / focus. Hunt's practice is concentrated in post-grant proceedings before the PTAB and the Federal Circuit, with a technical footprint in electrical and computer technologies: voice/speech and language-processing systems, machine learning, cryptography and data security, data storage and recovery, signal processing, networking and mobile technology, consumer software, media, and 3D printing. The tracked docket reflects that range — voice-browser/voice-search patents (Parus Holdings), data encryption and key-management patents (Security First Innovations), LTE/Wi-Fi wireless standards patents (Sol IP), and machine-learning/software matters. Firm and ranking profiles also list medical devices, accessibility technology, gaming, and financial transactions, and her firm bio cites a successful defense of a fibrosis-treatment patent in a competitor PGR (Enleofen/Boehringer Ingelheim), indicating at least some life-sciences post-grant work. IAM Patent 1000 has described her as an "ITC specialist," which suggests Section 337 work alongside her PTAB practice, though ITC appearances are not in the tracked list.

Side preference. Her tracked appearances skew heavily petitioner-side: five of six are "plaintiff"-side entries, which in the PTAB context means she is largely challenging patents rather than defending them, typically on behalf of large operating companies against NPE/PAE assertions. The profile data supports that framing — she is consistently described as a lead IPR/PGR and reexamination counsel for technology companies such as Google, Samsung, LG, RPX, Formlabs, and Nuance, and is ranked among the most active petitioner-side attorneys before the PTAB. She does defend patent owners as well (e.g., the Nuance medical-records IPR and the Enleofen PGR defense), so she is not exclusively a challenger. The one entry on the defendant side, Security First Innovations, LLC v. Google LLC, is the parallel district-court action to her IPRs, where she served as lead PTAB counsel rather than as trial counsel.

Firm context. All six tracked appearances are at Wolf Greenfield, where she is a shareholder and chairs the firm's Post-Grant Proceedings Practice (some IAM profiles list her as a co-chair of that practice alongside Richard Giunta). Public sources reviewed do not identify any prior firm; if she practiced elsewhere before Wolf Greenfield, it is not reflected in the material searched. She is based in the firm's Boston office.

Notable cases and outcomes. (1) Parus Holdings, Inc. v. Google LLC — as lead IPR counsel for Google, LG, and Samsung, she obtained final written decisions invalidating all challenged claims of the '431 and '084 voice-search patents (IPR2020-00846/-847); the Federal Circuit affirmed (70 F.4th 1365, June 12, 2023), a frequently cited decision on the patent owner's burden of production and the bar on incorporation by reference. In the related '705 patent IPR (IPR2022-00279), the Board initially upheld claims 1–2, and the Federal Circuit vacated and remanded in July 2026 on APA grounds — a mixed subsequent result. (2) Security First Innovations — as lead counsel for Google in four IPRs (IPR2024-00212 through -215), the Board found all challenged claims of the '609 and '116 data-security patents unpatentable and the district court stayed the parallel E.D. Va. case; the patent owner sought Director Review and has appealed (Fed. Cir. 25-1942). (3) Also credited in firm materials: IPRs invalidating instant-messaging claims asserted by Zipit Wireless and a 3D-printing patent for Formlabs, a successful ex parte reexamination against Cypress Lake Software affirmed by the PTAB, defense wins for Nuance, and a first-of-its-kind PTAB award of attorneys' fees as a sanction in an RPX matter. (4) Sol IP, LLC v. AT&T Mobility LLC / Sprint — backup counsel on the licensee side of a multi-patent LTE and Wi-Fi campaign involving Ericsson and Nokia interventions; the court's claim construction found certain asserted Wi-Fi claim terms indefinite.

PTAB / IPR experience. This is the core of her practice. Firm and ranking profiles state she has been of record in more than 100 PTAB proceedings as both challenger and patentee, is chair of a practice ranked in Patexia's top 1% for PTAB performance, is ranked in the top 1% of most active petitioner-side attorneys, and was named by the PTAB Bar Association among the Top 50 Women in PTAB Trials. She appears regularly in IPRs, PGRs, and ex parte reexaminations, with accompanying Federal Circuit appellate work.

Bar / education. Registered to practice before the USPTO (Reg. No. 67,336). Princeton University, B.S., Electrical Engineering; MIT, M.S. and Ph.D., Electrical Engineering and Computer Science; Suffolk University Law School, J.D. Specific state bar admissions were not confirmed in the sources reviewed.