Jung S. Hahm

Jung S. Hahm — patent litigation and PTAB practice (summary)

Focus areas. Hahm's patent work centers on video/audio and standards-related technologies — HEVC, AV1, and other video codec and wireless/SEP subject matter — consistent with the SEP "Video Codec Zone" program under which his tracked cases arose. A physicist by training, his earlier practice at Amster Rothstein covered network security, semiconductors and MEMS, flash memory, consumer electronics, 3D graphics, optical and acoustic devices, photolithography, mechanical devices, and financial business methods. On the prosecution side he handled utility and design applications, reexaminations (inter partes and ex parte), and international portfolio work, and he has evaluated standard-essential patent assertions.

Side preference. Exclusively petitioner/challenger side: both tracked appearances are as plaintiff, and neither is a defense of an operating company in district court. Public records show him filing and managing inter partes reviews for Unified Patents, a for-profit, membership-based entity whose stated model is adverse to NPEs and to asserted SEP portfolios, funding challenges on behalf of member operating companies (e.g., IPR2021-00275 against Dolby; IPRs against Velos Media, DataCloud Technologies, WSOU Investments, Sovereign Peak Ventures, mCom IP, Invincible IP, Longhorn HD, IdeaHub). He has not appeared as counsel prosecuting patents for NPEs/PAEs, nor as district-court defense counsel in these records.

Firm context. Hahm joined Unified Patents, LLC in April 2019 as Senior Patent Counsel, preparing and litigating PTAB proceedings as in-house counsel; his Unified role is documented in PTAB filings and Unified announcements through at least 2022, and I could not verify his current employer as of this writing. Before Unified he spent over 16 years at Amster, Rothstein & Ebenstein LLP (New York), rising to Senior Counsel, and was previously an associate at Fish & Neave (2000–2002). In 2008–2009 he was seconded to Panasonic Corporation in Osaka as in-house patent counsel for its AVC Networks and IP rights operations.

Notable cases and PTAB experience. Hahm appears regularly in IPR/PGR practice and is registered with the USPTO (Reg. No. 48,333), serving as lead or back-up counsel on numerous Unified petitions (e.g., IPR2019-00501, IPR2019-00707, IPR2020-00742, IPR2020-01228, IPR2020-01338, IPR2021-00275) and as counsel on ex parte reexamination and China CNIPA invalidation efforts, including successful CNIPA invalidation of Dolby HEVC/AV1-designated patents in late 2021. The most prominent tracked matter, Unified Patents, LLC v. Dolby Laboratories Licensing Corp. (IPR2021-00275, U.S. Patent 10,237,577), produced a mixed result: the Board's June 2022 final written decision held Unified failed to show unpatentability on the merits, and the Federal Circuit's June 5, 2025 precedential decision (appeal captioned Dolby v. Unified, No. 23-2110) dismissed Dolby's appeal for lack of Article III standing to challenge the Board's refusal to decide the real-party-in-interest dispute; rehearing en banc was denied in September 2025 and a cert petition (No. 25-1011) remains pending. Earlier, he assisted in First Quality Baby Products, LLC v. Kimberly-Clark Worldwide, Inc., IPR2014-00169, where the PTAB's May 2015 final written decision held all challenged claims of the '876 patent (training-pant side-panel folding) unpatentable.

Bar and education. Admitted in New York and New Jersey and before the Federal Circuit; registered to practice before the USPTO (2001). J.D., Cornell Law School (2000); M.S. in Physics, University of Illinois at Urbana-Champaign (1991); A.B. in Physics, Cornell University (1989).