Daniel Leventhal

Daniel Leventhal is a prominent patent litigator and co-head of the US IP Disputes Group at Norton Rose Fulbright US LLP, operating from the firm's Houston and Austin offices. His practice is primarily focused on high-tech patent litigation, encompassing a broad range of technology sectors including general technology, life sciences, energy, consumer markets, semiconductors, and telecommunications and software. He demonstrates expertise in complex patent disputes, often handling cases related to technologies such as Passive Optical Networks (PONs) and radio frequency spectrum management in wireless networks.

Leventhal represents both plaintiffs and defendants, showcasing a balanced approach to patent litigation. While the tracked cases show appearances on both plaintiff (2) and defendant (1) sides, his client roster prominently features major operating companies such as AT&T, Qualcomm, Palo Alto Communications, Oilify New-Tech Solutions Inc., NXP Semiconductors, and HP Inc., indicating a significant focus on defending corporate clients in high-stakes matters. He served as lead counsel for AT&T in SPADA Innovations, Inc. v. AT&T Inc., a case concerning methods of using Passive Optical Networks.

His experience extends significantly to proceedings before the Patent Trial and Appeal Board (PTAB), where he actively handles Inter Partes Reviews (IPRs), Post-Grant Reviews (PGRs), and Covered Business Method (CBM) reviews. He represents both petitioners challenging patent validity and patent owners defending their intellectual property. Notable PTAB engagements include representing Patent Owner Smith Interface Technologies, LLC in IPRs against Apple Inc., and contributing to the legal team for Qualcomm in IPR proceedings against FedEx. Leventhal also shares insights on post-issuance proceedings through Norton Rose Fulbright's "Patent Challenges" blog.

Among his notable achievements, Leventhal secured a summary judgment victory for Oilify New-Tech Solutions Inc. in the US District Court for the Western District of Texas, where all asserted claims of three patents were found invalid. He is registered to practice before the U.S. Patent and Trademark Office.