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Kenyon Successfully Represents Toyota in Years-Long Patent Litigation

Kenyon & Kenyon LLP successfully represented Toyota Motor Corp. in a long term patent litigation against American Vehicular Sciences (AVS). Originally brought by AVS in the Eastern District of Texas, the matter asserted 24 patents across seven separate cases – accusing essentially every major Toyota vehicular safety system. In the three years since the original filing, the Kenyon team filed 12 separate petitions for inter partes review (IPR) and won a stay in the E.D. Tex. pending resolution of the IPRs. The Patent Trial and Appeal Board granted each of the IPRs, and significant claims were cancelled or dropped. Additionally, the Kenyon team successfully petitioned the Federal Circuit for a writ of mandamus and the case was transferred from the E.D. Tex. to the Eastern District of Michigan, and filed various invalidity summary judgment papers, causing the plaintiff to drop a number of other asserted patents. In May of 2015, the E.D. Mich. granted the plaintiff’s unopposed motions to dismiss with prejudice all of the remaining cases against Toyota. (2015)

Carmella L. Stephens, Ph.D. Counsel
New York, NY 1.212.908.6320


Carmella Stephens has substantial experience in a wide variety of intellectual property matters, with a particular emphasis in the biotechnology and pharmaceutical industries. In particular, Dr. Stephens has prepared and prosecuted many applications involving gene therapy, RNA based therapeutics, bioassays, immunobiology, signal transduction and genomics. Dr. Stephens has also counseled clients on legal issues relating to biotechnology and pharmaceutical patents, including patent enforcement, validity and infringement, licensing, and business development.

Dr. Stephens has been an instructor for the Practising Law Institute's yearly Conference on Advanced Claim Drafting & Amendment Writing in Biotechnology Practice. 

Dr. Stephens’ thesis research was conducted at Cold Spring Harbor Laboratory and concentrated on adenovirus E1A proteins and their role in cell proliferation. After receiving her Ph.D., she completed a post-doctoral fellowship at Memorial Sloan-Kettering Institute where her research focused on transforming growth factor-ß mediated signal transduction.




  • Fordham University School of Law, J.D., 1996
  • Microbiology, Ph.D., 1989, Cold Spring Harbor Laboratory
  • Adelphi University, Biology, B.S., cum laude, 1979

Bar and Court Admissions

  • New York
  • U.S. District Court for the Southern District of New York
  • U.S. Patent and Trademark Office

Professional Organizations

  • New York Biotechnology Association
  • Association of University Technology Managers