Turner Boyd

Turner Boyd was formerly an intellectual property litigation boutique known as Turner Boyd Seraphine, which was acquired by Am Law Second Hundred firm Thompson Hine LLP in January 2026. The acquisition established Thompson Hine's Silicon Valley office, integrating Turner Boyd Seraphine's exclusive focus on IP litigation into a national practice. Headquartered in San Mateo, California, the predecessor firm was recognized nationally in 2026 by Best Law Firms for Litigation–Intellectual Property, Litigation–Patent, and Patent Law, also achieving a Tier 1 ranking in these categories in the San Francisco Metro area.

The firm's patent litigation specialty spanned diverse and complex technological domains. Its attorneys possess scientific and technical backgrounds, including advanced degrees in molecular biology, physics, biophysics, and various engineering disciplines. This expertise allowed them to handle patent disputes across fields such as gene therapy, non-invasive pre-natal and cancer testing, DNA-encoded libraries, transgenic animals, microfluidic platforms, medical devices, pharmaceuticals, consumer electronics, and semiconductors.

Turner Boyd Seraphine maintained a balanced approach to patent litigation, representing both plaintiffs and defendants. While the firm's tracked appearances indicate a defense-side role in one instance, public records show representation of major operating companies, such as Infineon Technologies (a semiconductor manufacturer) as a plaintiff in patent infringement actions. The firm was noted for its ability to litigate against both large corporations and non-practicing entities.

Notable engagements include founding partner Karen Boyd's representation of Infineon Technologies in a patent infringement complaint against Innoscience concerning gallium nitride (GaN) technology, which led to an investigation by the U.S. International Trade Commission (ITC) in August 2024. The firm also has a strong track record in post-grant review proceedings before the U.S. Patent and Trademark Office (PTAB), with attorneys like Karen Boyd successfully arguing for the invalidation of challenged patent claims in inter partes review (IPR) proceedings. The integrated Thompson Hine team continues to offer significant capabilities before the PTAB and ITC.

Key partners from the former Turner Boyd Seraphine who now contribute to Thompson Hine's Intellectual Property & Technology Litigation practice include Karen I. Boyd and Jacob Zweig. Karen Boyd, a founding partner of Turner Boyd, is a highly recognized patent litigator with over two decades of experience, including a clerkship at the Federal Circuit. Jacob Zweig is also an experienced litigator in patent and trademark disputes, with a background in IPR proceedings and diverse technology areas such as semiconductors and biotechnology.