Li Feng

Li Feng

Li Feng is a Partner at Finnegan who focuses her practice on patent litigation before U.S. district courts, post-grant proceedings before the Patent Trial and Appeal Board (PTAB) of the U.S. Patent and Trademark Office (USPTO), patent prosecution, opinions and counseling, and due diligence. Her technical experience spans a broad range of technologies, including pharmaceutical, biotechnology, medical device, chemical, agriculture, nanotechnology, cosmetic, and metallurgy. Dr. Feng has represented a number of pharmaceutical companies in Abbreviated New Drug Application (ANDA) litigation, conducting analysis and developing validity, infringement, and enforcement positions. She also frequently speaks on intellectual property topics.

For more information, or to contact Dr. Feng, please visit her Firm Profile Page


Posts by Li Feng


Patenting Antibodies: Written Description Considerations in Antibody Patents

The Amgen v. Sanofi decision put most functional antibody claims into question, including epitope and competitive binding claims, as well as antibody claims based on a newly …
By Li Feng & Stacy Lewis
2 months ago 2

Patenting Antibodies: Obviousness Considerations

This article analyzes obviousness issues related to antibody patents at the Patent Trials and Appeal Board (PTAB) and in federal courts. We review several cases categorized by …

The Immunotherapy Patent Landscape: Types of patent claims for immunotherapeutic inventions

Immunotherapy has emerged as one of the most promising mechanisms to combat diseases like cancer and microbial infections. Since 2000, multiple antibody drugs have reached blockbuster status, including …

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