Joseph Rossi is a partner in the Intellectual Property practice group focusing on matters relating to the chemical, pharmaceutical and medical arts, with particular emphasis in patent preparation and prosecution. Joe also advises clients on international patent portfolio management, patent validity and infringement studies, post-issuance proceedings, freedom-to-operate studies and patent litigation.

A significant component of Joe’s practice entails working on-site with inventors, business teams and in-house counsel of major chemical and pharmaceutical companies to develop and execute strategies to obtain, protect and enforce their intellectual property rights, as well as to avoid infringing competitor patent rights.

Joe’s extensive technical experience includes organic, inorganic and polymer chemistry; silicon polymer chemistry; all aspects of microelectronics production; pharmaceuticals; chemical process technologies; electrochemistry; coatings and film; packaging technologies; catalysts; industrial gases; membranes and membrane systems; medical processes and devices; detergents and cleaners; and lithography.

For over 20 years he has been preparing and prosecuting U.S. and international patent applications in the areas of chemical, pharmaceutical and packaging technologies. Joe is skilled at developing and implementing patent strategies for clients, performing intellectual property due diligence reviews and analyses, mediating disputes regarding inventorship between parties to joint development agreements, and handling all aspects of intellectual property litigation.


Prior to joining Armstrong Teasdale, Joe served as partner at a large full-service law firm headquartered in Philadelphia. He also previously served as a partner at a Philadelphia boutique intellectual property law firm.


  • Temple University  (J.D., 1999)
  • St. Joseph’s University  (M.S., 1992)
    • Organic Chemistry
  • St. Joseph’s University  (B.S., 1989)
    • Chemistry


  • Pennsylvania
  • U.S. Patent and Trademark Office
  • U.S. District Court, Eastern District of Pennsylvania

Professional Activities

  • Benjamin Franklin Inn of Court
  • Philadelphia Intellectual Property Law Association


  • Five-Star Attorney, Suburban Life Magazine
  • The Best Lawyers in America®, Patent Law (2016-present)
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