Daniel A. Klein

Daniel Klein, staff attorney in Choate’s Intellectual Property Group, is primarily involved in training, knowledge management and procedures related to U.S. and international patent practice. Prior to assuming this role, Mr. Klein practiced for approximately 16 years as a patent attorney in both law firm and in-house settings.

His experience as outside counsel includes creating and managing global patent portfolios for proprietary pharmaceutical companies as well as performing freedom-to-operate and invalidity analyses for generic pharmaceutical companies in the context of ANDA submissions. He also has experience as in-house counsel for three global pharmaceutical companies managing all aspects of intellectual property for drug candidate programs throughout various phases of research and development, as well as counseling R&D and business units on issues relating to IP, including Hatch-Waxman and product lifecycle management, performing due diligence investigations and assisting with licenses and acquisitions.

Publications and Presentations

  • “Patentees Should Now Consider Reissue As Strategic Option,” co-author, IP Law360, April 2013.
  • “Prospectively Curing Inequitable Conduct Through Reissue: Reconsidering a ‘Well-Settled Principle’,” author, Santa Clara Computer & High Technology Law Journal, 2010.
  • "Improved Treatment of Cyclic β-Amino Acids and Successful Prediction of β-Peptide Secondary Structure by a Modified Force Field: AMBER*C," co-author, Journal of Computational Chemistry, 2000.
  • “Synthesis and Structural Characterization of Helix Forming β-Peptides: Trans-2- Aminocyclopentanecarboxylic Acid Oligomers,” co-author, Journal of the American Chemical Society,1999.
  • “Residue-Based Control of Helix Shape in β-Peptide Oligomers,” co-author, Nature, 1997.

Mr. Klein is an inventor on United States Patents 6,060,585 and 6,613,876.

Professional and Community Involvement

  • Boston Patent Law Association.

Education & Credentials

Duke University School of Law
JD, 2001
Articles Editor, Journal of Law & Contemporary Problems
University of Wisconsin
MS, 1996, Organic Chemistry
Bucknell University
BS, 1994, Chemistry, magna cum laude, Phi Beta Kappa



District of Columbia

U.S. Patent & Trademark Office