Bill Nash



Education and Clerkships

J.D., St. Mary's University School of Law, with distinction; Phi Delta Phi; John M. Harlan Society; Articles Editor, St. Mary's Law Journal

B.S., Ocean Engineering, U.S. Naval Academy



U.S. Patent and Trademark Office

Canadian Intellectual Property Office

Court Admissions

U.S. District Court for the District of Colorado

Texas Supreme Court, 1988

U.S. District Court for the Eastern District of Texas, 1990

U.S. District Court for the Northern District of Texas, 1990

U.S. District Court for the Southern District of Texas, 1990

U.S. District Court for the Western District of Texas, 1989

U.S. Court of Appeals for the Federal Circuit, 1991

U.S. Court of Appeals for the Fifth Circuit, 1991

U.S. Court of Appeals for the Tenth Circuit, 1991


William B. ("Bill") Nash is a partner in Haynes and Boone's Intellectual Property Litigation Practice in the firm's San Antonio and Dallas offices. Bill is a registered patent attorney and litigator with more than 30 years of extensive national and international experience in intellectual property.

As a litigator, Bill protects his clients' rights and is often called upon in critical company litigation. He has handled major patent infringement, trademark infringement, copyright infringement, unfair competition, and trade secret cases in jurisdictions from California to Massachusetts, including the U.S. International Trade Commission (ITC) in Washington, D.C., in addition to those filed in the four federal districts within Texas. As an intellectual property advisor and expert, he has broad experience in infringement and validity opinions, and he regularly helps clients develop strategies to avoid or minimize litigation risks. Bill works closely with his clients to protect, develop, commercialize, and license a company's IP assets, both in the U.S. and internationally. He has been responsible for more than 4,000 trademark filings around the world and has been lead attorney on more than 100 proceedings before the Trademark Trial and Appeal Board.

Bill is AV® Peer Review Rated Preeminent by Martindale-Hubbell® Law Directory and was recognized by World Trademark Review's WTR 1000, Globe Business Publishing, 2017-2021. Bill was recognized in Best Lawyers in America, Woodward/White, Inc., for Litigation - Patent, 2019-2021. Additionally, Bill was recognized by San Antonio Scene, Scene Monthly LLC, in Best San Antonio Lawyers for Intellectual Property Litigation, 2015. He also received the Outstanding Lawyer Award by San Antonio Business Journal, American City Business Journals, in 2016.


World Trademark Review

Haynes and Boone’s Growing Trademark Practice Again Awarded Top National Ranking in Prestigious 2021 WTR 1000

Haynes and Boone, LLP’s Trademark Practice Group has again been honored as one of the top 11 “National Gold Tier” trademark practices in the country in the 2021 edition of the World Trademark Review 1000 directory of leading trademark professionals. This is the 11th consecutive year for the firm to place among the U.S. leaders in the WTR 1000, which is based on interviews with clients and trademark practitioners.

Intellectual Property

The Intellectual Property Law 2018 Year In Review

We are pleased to highlight some of our representative intellectual property-related client successes and publications over the past year that might be relevant to your business success in the coming year. We represented clients in 74 inter partes review/PTAB proceedings that were filed in 2018, and our patent prosecution team filed over 2,300 U.S. patent applications and helped issue more than 1,650 U.S. patents just in 2018. We also helped close the IP issues in dozens of financings, M&A transactions, and joint venture/licensing arrangements.


Bill regularly handles:
  • Licenses 
  • Research and Development Agreements 
  • Software Agreements 
  • Distributorship Agreements 
  • Mergers and Acquisitions 
  • Assignments and Transfer Agreements 
  • Employment Agreements 
  • Franchise Agreements 
  • Consultant Agreements 
  • Commercialization Agreements 

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