Calmann James Clements

Calmann Clements is an experienced patent attorney who assists clients with invalidity strategies for complex patent disputes, including litigation, PTAB trials, ex parte reexaminations, and licensing negotiations. In 2024 and 2025, Patexia ranked Calmann among the top ten most successful PTAB practitioners representing petitioners. Calmann brings deep experience in challenging and defending patents in high-stakes proceedings.

Calmann’s practice focuses on invalidity in patent disputes, with a particular focus on post-grant proceedings. He has represented clients in over 100 post-grant proceedings, including inter partes reviews and ex parte reexaminations, and regularly advises on invalidity issues in litigation and licensing contexts. Drawing on his extensive patent prosecution experience and electrical engineering background, Calmann crafts persuasive positions that withstand rigorous scrutiny.

Calmann’s technical expertise spans a broad range of fields, including computer hardware and memory systems, networking protocols, telecommunications, audio and video codecs, semiconductor fabrication, and more. This breadth allows him to deliver invalidity and patentability strategies tailored to diverse technologies and industries.

Outside of law practice, Calmann enjoys listening to, writing, and recording rock music. Calmann also enjoys reading and learning about new technologies, particularly AI and autonomous vehicle technology.