David Radulescu

Specialty / focus areas. David Radulescu is a trial lawyer whose practice is concentrated in high-stakes patent litigation for the semiconductor and electronics industries, with a recognized specialty in LED/solid-state lighting technology. Firm materials and third-party coverage (Chambers, EdisonReport, Inside Lighting) describe him as having litigated more LED patent cases than any other U.S. lawyer (70+ cases involving 150+ LED patents), with additional experience in optical communications, hard-disk drives, flash memory, 3G/WCDMA cellular standards, and Section 337 ITC investigations. The two tracked appearances (Feit Electric v. Elong International USA, N.D. Tex., and the related IPR petitions captioned Elong v. Feit) fall squarely in his LED-filament wheelhouse, involving U.S. Patent No. 8,604,678.

Side preference. Radulescu works both sides, with no fixed preference. The tracked docket splits 1 plaintiff-side / 1 defendant-side appearance — in the district court he serves as lead defense counsel for Elong International and Xiamen Longstar against Feit's infringement suit, and in the parallel PTAB proceedings he appears as lead petitioner counsel for the same Elong/Longstar parties. His broader record confirms this duality: he has defended operating companies such as Cree, Samsung, Marvell, and WAC Lighting while also prosecuting infringement actions for plaintiffs including Seoul Semiconductor, Finisar, Everlight, and the University of California (Shuji Nakamura's LED licensing program). His firm markets itself as routinely appearing for both plaintiffs and defendants.

Firm context. Radulescu is the founder and name partner of Radulescu LLP, a boutique patent-litigation firm with offices in New York and Texas, founded roughly a decade ago. Earlier in his career he was a partner at Quinn Emanuel (joining in 2010) and previously a partner at Weil, Gotshal & Manges, where he began as an associate; he started out prosecuting patent applications before moving into litigation.

Notable cases / outcomes. Beyond the tracked Feit–Elong matter (which ended in a joint dismissal without prejudice in January 2026, after discretionary denial of the Elong-side IPR petitions in June 2025), his verifiable results include: leading Cree to a summary judgment of patent invalidity in Fox Group v. Cree, affirmed on appeal by the Federal Circuit; prevailing on a motion to dismiss in Dow Corning v. Cree, also affirmed by the Federal Circuit; winning 10 of 10 dispositive claim-construction rulings for Seoul Semiconductor against Nichia; and obtaining a consented judgment of validity and infringement for Seoul Semiconductor in Seoul v. Craig Electronics. He also led WAC Lighting's defense against Philips and has handled multiple ITC Section 337 investigations for Samsung, Lexar, and Thomson.

PTAB / IPR experience. Yes — IPR work is a recurring part of his practice. He has served as petitioner counsel in the seven WAC Lighting v. Philips IPRs (2015) and in the recent Elong/Longstar petitions against Feit's '678 patent, and he regularly comments publicly on IPR strategy and PTAB trends in the LED industry.

Bar / education. Radulescu holds a Ph.D. in electrical engineering from Cornell, a J.D. from Columbia Law School (1991), and was admitted to the New York bar in 1992 (Super Lawyers 2011–2024). His USPTO registration is not directly confirmed in the sources reviewed, though his early prosecution practice implies it.