Our People

Clifford J. Mass


Phone: (212) 708-1890 | Fax: (212) 246-8959

Clifford J. Mass is a partner in the New York Office of Ladas & Parry.

He has extensive experience in patent preparation and prosecution covering a wide range of technologies, with a focus on biotechnology and the chemical arts, including recombinant nucleic acid technologies, pharmaceuticals, chemical processing technology and polymer chemistry. He often provides validity and infringement opinions in these and other art areas.

Cliff is also an experienced litigator. He has been lead attorney in complex patent interferences, including multi-party interference. He has both first chair and second chair litigation experience in the Federal courts, and has prosecuted and argued cases before the Board of Patent Appeals and Interferences. His reported cases include: Ex parte Van Tunen, 67 USPQ 2d 1518 (BPAI 2003); Accent Designs, Inc. v. Jan Jewelry Designs, Inc., 30 USPQ 2d 1734 (S.D.N.Y. 1993) and 32 USPQ 2d 1036 (S.D.N.Y. 1994); and Kochler v. Mustonen, 774 F. Supp. 641 (D.D.C. 1991).

He received his B.A. degree in molecular biology from the University of Pennsylvania and received a J.D. degree from Emory University, and later continued his molecular biology studies at Georgia Tech. Cliff is admitted to the bars of New York, Georgia and the U.S. Patent and Trademark Office. He is also admitted to Federal district courts in New York and Georgia, and to the Federal Circuit Court of Appeals.

When not practicing law, Cliff is a passionate golfer and enjoys following professional tennis and basketball.


University of Pennsylvania (B.A., 1972)
Emory University (J.D., 1977)
Advanced Scientific Studies at Georgia tech (1978-79)

Practice Areas
  • Patents – Chemistry, Biotech, Mechanical Engineering
  • Designs
  • U.S. Litigation
  • Trade Secrets

New York
U.S. Patent and Trademark Office – Registered Patent Attorney
U.S. Court of Appeals for the Federal Circuit
U.S. District Court for the Southern District of New York
U.S. District Court for the Eastern District of New York
U.S. District Court for the Northern District of Georgia

Key Industries
  • Pharmaceuticals
  • Food and Beverage
  • Energy
  • Mechanical Devices
  • Clean Technology
  • Alternative Energy
  • Life Sciences