Laurence H. Posorske, PhD

Larry's practice focuses on the representation of technology-based companies of all sizes.
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Larry's practice focuses on representation of technology-based companies of all sizes in matters relating to patents and technology licenses, and strategic counseling on structure and enforcement of intellectual property portfolios. He has legal and patent experience with:

  • Novel proteins and recombinant DNA
  • Monoclonal antibodies
  • Biopharmaceuticals
  • Antimicrobial and cancer therapeutics
  • Plant Patents and utility patents on plants
  • Plant cell technology
  • Microbial fermentation methods and equipment
  • Drug formulations and therapeutic protocols
  • Food products 
  • Infant nutrition
  • Novel organisms, including:
    • Transgenic animals
    • Gene therapy
    • Genomics
    • Hormonal
    • Other cellular control mechanisms
  • Imaging and diagnostics, including:
    • Immunoassays
    • Artificial intelligence methods
  • Medical devices

In addition, Larry has significant research experience in the fields of enzymology, biotechnology, food processing, papermaking, and biomass-to-energy conversion, as an industrial research scientist.

Client Work

Larry’s work includes:

  • Prepare and prosecute domestic and international patent applications, including re-examination, interference, and appeals.
  • Oppose and defend over 25 patent Oppositions before five different jurisdictions, including the European, Japanese, and Korean Patent Offices.
  • Draft and negotiate patent and technology licenses and joint development agreements for medical devices, diagnostic techniques, and nutritional products.
  • Provide Patentability, Patent Validity, and Infringement Opinions.
  • Portfolio analysis for investment purposes, representing venture capitalist investors, as well as target companies.

Previous Work

Prior to joining ArentFox Schiff, Larry worked at a large, full service firm.

Professional Activities

Larry is involved in the following professional activities:

  • Member, American Bar Association
  • Member, American Intellectual Property Law Association
  • Member, American Chemical Society

Publications, Presentations and Recognitions


Larry’s publications include:

  • Co-author, How Are Diagnostic Methods Handled by the USPTO? Part II, Intellectual Property & Technology Law Journal, March 2018
  • Co-author, How Are Diagnostic Methods Handled by the USPTO? Part I, Intellectual Property & Technology Law Journal, February 2018
  • Industries
  • Bar & Court Admissions
    • District of Columbia Bar
    • Maryland Bar
    • US Patent and Trademark Office Bar
  • Education
    Georgetown University Law Center, JD, 1992
    Cornell University, PhD, 1976
    University of Wisconsin, BA, 1970