Panitch Schwarze Belisario & Nadel LLP

Two Commerce Square, 2001 Market Street
Suite 2800 Philadelphia PA 19103 U.S.A.

Dennis Butler

Intellectual Property

Dennis J. Butler is a Delaware and Pennsylvania attorney who helps innovators protect their inventions and companies protect their intellectual property. Dennis’ practice focuses on intellectual property and technology law, including representing clients in the U.S. District Court for the District of Delaware and additional U.S. district courts, as well as before the U.S. Patent and Trademark Office and foreign patent offices. Dennis has extensive experience in preparation, filing and prosecution of patent applications and inter partes reviews before the U.S. Patent Trial and Appeal Board. Dennis has extensive experience conducting in-person and remote interviews with U.S. patent examiners to expedite allowance of U.S. patents. His practice is concentrated in mechanical technologies, including medical devices, polymer systems and materials, small appliances, automotive mechanisms, cleantech technologies, structural composite assemblies, bicycle technology, indoor games and electro/mechanical devices. Prior to joining Panitch Schwarze Belisario & Nadel LLP, Dennis was patent counsel at a Synthes, Inc., where he managed the patent portfolio, assisted with patent litigation, formulated business arrangements and analyzed mergers and acquisitions for the spinal implant division. He was previously an associate and patent agent at Akin Gump Strauss Hauer & Feld LLP and an engineer with Boeing Defense and Space Group, Helicopters Division and United Technologies – Pratt & Whitney. His practice also focuses on patent litigation on behalf of both plaintiffs and defendants. He has worked on cases involving a wide variety of technologies, including medical devices, cellular telephones, electronic monitoring systems, and banking processes. Dennis is a member of the Delaware Bar, the Pennsylvania Bar, and Penn State Alumni Association. He is registered to practice before the U.S. Patent and Trademark Office and is admitted to practice before the U.S. District Court for the District of Delaware, Eastern, Central and Western Districts of Pennsylvania and Supreme Court of Delaware.


  • Irish American Business Network and Chamber of Commerce
  • FastStart Mentor Program, Mentor
  • Penn State Alumni Association


  • Temple University Law, Juris Doctor
  • Pennsylvania State University, MS EMCH
  • Pennsylvania State University, AS MET, BS MET