People

Kenneth Sonnenfeld specializes in intellectual property, particularly in the field of biotechnology and pharmaceutical law. As a partner in our Intellectual Property, Patent and Trademark Litigation practice, Ken represents multinational corporations and start-up companies in related IP matters.

With nearly 30 years of IP experience and a doctorate in pharmacology, Ken represents biotechnology and pharmaceutical companies in a full range of patent law matters. He advises clients on inter-party matters such as due diligence, litigation, foreign oppositions and licensing. He also handles complex strategic patent prosecution in the U.S. Patent and Trademark Office, as well as supervising foreign prosecution.

Recognized as one of the nation’s leading intellectual property lawyers in the field of biotechnology and pharmaceutical patent law, Ken is a frequent speaker at biotechnology patent law conferences. He has been ranked highly by IAM Patent 1000—The World's Leading Patent Professionals guide for litigation, patent prosecution and licensing, as well as by Chambers USA and Legal 500.

Full Bio

Credentials

J.D., Fordham University

Ph.D., Columbia University

M.Phil., Columbia University

M.A., Columbia University

B.A., Kenyon College, cum laude

Massachusetts

New York

Supreme Court of the United States

U.S. Court of Appeals for the Federal Circuit

U.S. District Court for the Eastern District of New York

U.S. District Court for the Southern District of New York

U.S. Patent and Trademark Office

Patent 1000: The World's Leading Patent Professionals


Intellectual Asset Management

Managing Intellectual Property Patent Star

Chambers USA

Legal 500

Icon close

Close

Recognition

Patent 1000: The World's Leading Patent Professionals


Intellectual Asset Management

Managing Intellectual Property Patent Star

Chambers USA

Legal 500

Matters

Daiichi Sankyo Company, Ltd. v. Michelle K. Lee, Director, United States Patent and Trademark Office. (represented Daiichi Sankyo in matter seeking correction of patent term);

National Genetics Institute and Baxter International, Inc. v. Talecris Biotherapeutics, Inc. (represented Baxter in case involving pooling of blood/plasma donations; case settled after successful reexamination of asserted claims in USPTO.)

Genentech vs. Novo Nordisk (Significant member of team defending Novo Nordisk in action involving recombinant expression of human growth hormone);

See more
Icon close

Close

Matters

Daiichi Sankyo Company, Ltd. v. Michelle K. Lee, Director, United States Patent and Trademark Office. (represented Daiichi Sankyo in matter seeking correction of patent term);

National Genetics Institute and Baxter International, Inc. v. Talecris Biotherapeutics, Inc. (represented Baxter in case involving pooling of blood/plasma donations; case settled after successful reexamination of asserted claims in USPTO.)

Genentech vs. Novo Nordisk (Significant member of team defending Novo Nordisk in action involving recombinant expression of human growth hormone);

Represent Alfa Wassermann as Hatch-Waxman litigation counsel working with trial counsel from another firm. Participate in strategic decision and protecting client's interests.

Conduct IP diligence and transaction document counsel on acquistion of 150 million dollar royalty stream.

Matters

Daiichi Sankyo Company, Ltd. v. Michelle K. Lee, Director, United States Patent and Trademark Office. (represented Daiichi Sankyo in matter seeking correction of patent term);

National Genetics Institute and Baxter International, Inc. v. Talecris Biotherapeutics, Inc. (represented Baxter in case involving pooling of blood/plasma donations; case settled after successful reexamination of asserted claims in USPTO.)

Genentech vs. Novo Nordisk (Significant member of team defending Novo Nordisk in action involving recombinant expression of human growth hormone);

See more
Icon close

Close

Matters

Daiichi Sankyo Company, Ltd. v. Michelle K. Lee, Director, United States Patent and Trademark Office. (represented Daiichi Sankyo in matter seeking correction of patent term);

National Genetics Institute and Baxter International, Inc. v. Talecris Biotherapeutics, Inc. (represented Baxter in case involving pooling of blood/plasma donations; case settled after successful reexamination of asserted claims in USPTO.)

Genentech vs. Novo Nordisk (Significant member of team defending Novo Nordisk in action involving recombinant expression of human growth hormone);

Represent Alfa Wassermann as Hatch-Waxman litigation counsel working with trial counsel from another firm. Participate in strategic decision and protecting client's interests.

Conduct IP diligence and transaction document counsel on acquistion of 150 million dollar royalty stream.

Credentials

J.D., Fordham University

Ph.D., Columbia University

M.Phil., Columbia University

M.A., Columbia University

B.A., Kenyon College, cum laude

Massachusetts

New York

Supreme Court of the United States

U.S. Court of Appeals for the Federal Circuit

U.S. District Court for the Eastern District of New York

U.S. District Court for the Southern District of New York

U.S. Patent and Trademark Office

Patent 1000: The World's Leading Patent Professionals


Intellectual Asset Management

Managing Intellectual Property Patent Star

Chambers USA

Legal 500

Icon close

Close

Recognition

Patent 1000: The World's Leading Patent Professionals


Intellectual Asset Management

Managing Intellectual Property Patent Star

Chambers USA

Legal 500