Alison T. Gelsleichter

Alison T. Gelsleichter is a patent litigation attorney at Mayer Brown, based in their Washington D.C. office, where she holds the role of counsel. Her practice is centered on patent infringement disputes before U.S. district courts, the International Trade Commission (ITC), and the U.S. Patent and Trademark Office. With a background in chemistry, Gelsleichter advises high-tech clients on complex discovery issues and manages litigation from pre-suit analysis through trial and post-trial motions.

Gelsleichter's litigation experience spans a diverse array of technologies, including telecommunication devices, LCD and OLED panels, mobile phones, automotive displays, medical devices, pharmaceuticals, and data processing. Her practice largely focuses on representing patentees, as evidenced by her appearances exclusively on the plaintiff side in tracked cases. She has secured significant outcomes for her clients, including a $43.3 million jury verdict for Maxell, Ltd. in Maxell, Ltd. v. ZTE USA LLC (E.D. Tex. 2018), where the jury found willful infringement of seven patents related to digital image processing, GPS navigation, cellular transmission, and audio processing. She also achieved favorable settlements for Maxell, Ltd. against Apple Inc. and in an ITC investigation involving smart home and IoT devices.

Recently, Gelsleichter was involved in LG Display Co., Ltd. v. Tianma Microelectronics Co., Ltd. et al. (E.D. Tex. 2025), representing LG Display in a dispute concerning seven LCD and OLED display technology patents that recently concluded in a confidential settlement. This case also involved inter partes review (IPR) proceedings at the Patent Trial and Appeal Board (PTAB), where Tianma's petitions to invalidate LG Display's patents were dismissed.

Gelsleichter is admitted to practice in Pennsylvania, the District of Columbia, and New York, and before the U.S. District Court for the Eastern District of Texas. She earned her B.S., magna cum laude, in Chemistry from King's College, an M.S. from the State University of New York, and her J.D., cum laude, from Syracuse University College of Law, where she was on the Syracuse Science & Technology Law Review.