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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)

Elizabeth Tretter Patent Agent
New York, NY 1.212.908.6183


Ms. Tretter received her bachelor’s degree from the LaSalle University in Philadelphia, where she conducted undergraduate research in the areas of polymer chemistry.  Ms. Tretter obtained her Master’s degree in Biomedical Sciences from Drexel University with a thesis entitled “Electroactive Polymers with Enhanced Biocompatibility for Neural Tissue Engineering, Getting One Step Closer to “Intelligent” Nanostructured Scaffolds.”  Her graduate research interest was in development of electrostatic polymers for use in tissue engineering applications.  During the course of her research, she employed Nuclear Magnetic Resonance, Infrared Spectroscopy, Ultraviolet and Visible Absorption Spectroscopy, Atomic Absorption Spectrometry, Gel Electrophoresis.

Ms. Tretter has authored research papers in several peer-reviewed journals and has presented her research at local conferences.

Prior to joining Kenyon & Kenyon LLP, Ms. Tretter assisted in domestic, foreign, and PCT patent prosecution relating to stem cell engineering and nanotechnology for a Washington D.C. based law firm.

Research and Presentations

  • Research area focused on the development of novel electroactive polymers for applications in tissue engineering.
  • Presented then-current state of research on “Methods of Synthesis of Electroactive Polymers” at Annual Research Day, Drexel University, May 2001.
  • Presented “Electroactive Polymers for Use in Tissue Engineering Applications,” E. Guterman, S. Cheng, K. Palouian, P. Bidez, P. Lelkes, Y. Wei, at IEEE 26th Northeast Bioengineering Conference, April 2002.
  • Presented “Stimulation of Neurite Outgrowth on Electrically Conductive Polymers Using Bioactive Peptides,” E. Guterman-Tretter, S. Cheng, K. Chang, Palouian, A. Tretiakova, B. Jameson, P. Bidez, P. Lelkes, Y. Wei at the Annual Research Day, Drexel University, May 2003.


  • "Electroactive Polymers and Nanostructured Materials for Neural Tissue Engineering" Yen Wei, Peter I. Lelkes, Alan G. MacDiarmid, Elizabeth Guterman-Tretter, Shan Cheng, Kolby Palouian and Paul Bidez, in "Contemporary Topics in Advanced Polymer Science and Technology"; Edited by Qi-Feng Zhou and Stephen Z.D. Cheng, Peking University Press, Beijing, China, ISBN7-301-07141-8, pp. 430-436, 2004.
  • Peptide-Modified Electroactive Polymers for Tissue Engineering Applications”, Elizabeth Guterman-Tretter, Shan Cheng, Kolby Palouian, Paul Bidez, Peter I. Lelkes, Yen Wei.  Abstract of Papers, 224th ACS National Meeting, August 2002.
  • “Electroactive Polymers and Nanostructures Materials for Neural Tissue Engineering”
  • Yen Wei, Peter I. Lelkes, Alan G. MacDiarmid, Elizabeth Guterman-Tretter, Shan Cheng, Kolby Palouian, and Paul Bidez in the Proceedings of International Conference Celebrating 50-years of Polymer Chemistry in China, Peking University Press, 2003.
  • Thesis: “Electroactive Polymers with Enhanced Biocompatibility for Neural Tissue Engineering, Getting One Step Closer to “Intelligent” Nanostructured Scaffolds”



  • Drexel University, Biomedical Engineering, M.S., 2003
  • LaSalle University, Major in Psychology, Minor in Chemistry, B.A., 2000

Bar and Court Admissions

  • U.S. Patent and Trademark Office


  • Russian
  • Ukrainian