Taeg Sang (Tim) Cho

Taeg Sang (Tim) Cho — Desmarais LLP (Partner, New York)

Focus. Dr. Cho's practice is concentrated on contested patent matters before the PTAB, with supporting district court litigation. His firm biography describes work across semiconductor devices and manufacturing processes, analog and digital electronics, computer software and database systems, signal processing, and wireless communications standards and systems, and identifies artificial intelligence/machine learning as an area of particular expertise (his MIT doctorate concerned machine learning algorithms and imaging electronics). The one tracked matter, Samsung Electronics Co., Ltd. et al. v. Chien-Min Sung, is a semiconductor-process case: Samsung's IPRs against Chien-Min Sung's CMP pad-conditioner patents (IPR2024‑00533/‑00534/‑00535), which ran parallel to Sung's E.D. Tex. infringement suit against Samsung.

Side preference. He is overwhelmingly a defense-side/operating-company lawyer rather than an NPE-side prosecutor. The structured data shows a single tracked plaintiff-side appearance — an IPR/DJ posture in which Samsung was the petitioner — but the broader record (Intel, Samsung, IBM, PNC Bank, Rakuten) is of representation of large technology and financial-services companies, either as petitioner challenging asserted patents or as patent owner defending its own portfolio. No pattern of representing assertion entities appears in the available sources.

Firm context. He is a partner at Desmarais LLP in New York, elevated effective January 1, 2024; per the firm's announcement he was previously at Desmarais and rejoined in 2022. Before that he was counsel at Wilmer Cutler Pickering Hale and Dorr, and he clerked for Judge Paul A. Crotty (S.D.N.Y.) in 2017–2018.

Notable matters and PTAB experience. PTAB work is the core of the practice: he has served as lead counsel in several IPRs that invalidated patents asserted in parallel district court cases, and appears repeatedly as petitioner or patent-owner counsel (e.g., Intel v. VLSI IPR2019‑01197 as backup counsel; PNC Bank IPR2022‑00050; lead counsel for IBM in the Rakuten/Rewards and Zillow IPRs, including IPR2022‑00133 and IPR2022‑00646, and a Precedential Opinion Panel rehearing request on institution authority). In the IBM matter the Board's decision was appealed and the Federal Circuit (Nos. 24‑1170 et al., Dec. 9, 2025) rejected IBM's anticipation-analysis and substantial-evidence arguments. In the Sung matter, the Board found the challenged claims unpatentable in the Samsung IPRs; the parallel E.D. Tex. case was stayed, and Sung's Federal Circuit appeal of the IPR2024‑00533 decision was dismissed by agreement in March 2026.

Bar/education. Admitted New York (2017) and registered before the USPTO (Reg. No. 69,618); J.D. magna cum laude, Fordham; Ph.D. and M.S., EECS, MIT; B.S. electrical engineering, KAIST.

Caveat: the tracked appearance list supplied is thin relative to the volume of PTAB filings publicly associated with this name; the PTAB matters above are drawn from docket and firm-published records rather than the tracked case list, and outcomes should be confirmed against the underlying papers before being relied on.