Philip L. Hirschhorn

Buchanan Ingersoll & Rooney PC

With more than 25 years’ experience as an intellectual property (IP) trial lawyer, Phil still enjoys the learning process that takes place with a new client and a new challenge.

Phil’s extensive experience includes bench and jury trials and arbitrations (including one, centered on a biotechnology product, that lasted nine months). 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 partesreviews.

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

One aspect of Phil’s success is his ability to take difficult legal and technical questions and translate them for courts and juries. He works with clients to fully understand their business, including how IP litigation affects business objectives.

Clients know that Phil will go the extra mile, on his own or as he manages a team effort, to resolve the client’s issues.


  • New York City Bar Association, Chair, Patents Committee
  • PTAB/TTAB Committee, Vice Chair
  • New York Intellectual Property Law Association
  • The Federal Circuit Bar Association


  • Fordham University, J.D., 1988, Associate Editor of the Fordham Law Review, Editor of the Fordham Environmental Law Report
  • Columbia College, B.A., 1984


Rate : $$$

What types of cases Attorney Philip L. Hirschhorn & Buchanan Ingersoll & Rooney PC can handle?
Buchanan Ingersoll & Rooney PC can handle cases related to laws concerning Copyright Application, Litigation, Intellectual Property. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
Where is Buchanan Ingersoll & Rooney PC located?
Buchanan Ingersoll & Rooney PC is located at 640 5th Ave #9th+floor, New York, NY 10019, USA. You can reach out to Buchanan Ingersoll & Rooney PC using their phone line 212 440 4470. You can also check their website
How much would it cost to hire Buchanan Ingersoll & Rooney PC?
Philip L. Hirschhorn lawyer charges are specific to each case. However, they work with contingency fees and its ranges from $$ to $$$. They also provide free consultation [and no obligation quotes] if you are interested to hire.
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Buchanan Ingersoll & Rooney PC
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New York 10019 NY US
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