Panitch Schwarze Belisario & Nadel

Based on an analysis of the firm's public profile and available legal rankings as of May 1, 2026, here is a professional summary of the patent litigation practice of Panitch Schwarze Belisario & Nadel LLP.

Firm Overview

Panitch Schwarze Belisario & Nadel LLP is an intellectual property boutique law firm headquartered in Philadelphia, Pennsylvania, with additional offices in Wilmington, Delaware, and Alexandria, Virginia. The firm consists of over 20 attorneys and patent agents whose practice is focused exclusively on IP law. Panitch Schwarze is recognized by Chambers USA, which ranks its intellectual property practice in Pennsylvania, noting its capabilities in patent and trademark matters for a diverse client base.

Litigation and Technology Specialties

The firm litigates patent disputes across a broad spectrum of technical fields, including life sciences, chemicals, electronics, software, and consumer products. Its practitioners often hold advanced technical degrees in disciplines such as chemistry, microbiology, and various engineering fields. While the firm's public materials state it handles litigation both offensively and defensively, its tracked case history is limited to one matter, Neomedia Technologies, Inc. v. Symbol Technologies, Inc., where it appeared as local counsel for the defendant.

PTAB/IPR Practice

Panitch Schwarze maintains an active Patent Trial and Appeal Board (PTAB) practice, representing both patent owners and petitioners. The firm's website indicates it handled 154 contested proceedings between 2023 and 2025, which includes inter partes review (IPR), post-grant review (PGR), and other matters before the U.S. Patent and Trademark Office. Attorneys from the firm are active in the PTAB community, participating in and moderating events on PTAB practice developments.

Key Partners

The firm was founded by partners including Ronald L. Panitch and the late Alan S. Nadel, both of whom are retired from active practice. Today, the practice features several partners recognized by industry publications. Key practitioners in the patent group include name partner Martin G. Belisario, noted for his work with manufacturing and life sciences clients, alongside partners such as Clark A. Jablon, John D. Simmons, and Philip L. Hirschhorn, who are also active in patent litigation and PTAB proceedings.