Philip L. Hirschhorn


Buchanan Ingersoll & Rooney PC

Phil has more than 25 years' experience as an intellectual property (IP) trial lawyer.  His extensive experience includes bench and jury trials and arbitrations. He has represented clients in Hatch-Waxman (Paragraph IV) litigations, has worked in diverse industries such as graphics, visualization technologies, medical device, chemical and consumer products, and also has experience handling copyright and trademark/trade dress litigation.

In patent litigation, Phil has counseled clients on the interplay between Patent Office and district court proceedings. He has represented clients involved in proceedings in or with the Patent Office, including § 145 actions to obtain patents, ex parte and inter partes reexaminations and, with the advent of the America Invents Act, adversarial post-grant proceedings, including inter partes reviews.

Phil is the managing shareholder for Buchanan's New York City office and the former co-chair of the firm's IP Section.