William C. ‘Trey’ Yarbrough, J.D., Pharm.D.

William 'Trey' Yarbrough is a Senior Patent Attorney at Kearney, McWilliams & Davis, PLLC.  He is a USPTO Registered Patent Attorney and practices Intellectual Property Law with a focus on patent prosecution, patent litigation and trademark registration.  He studied Microbiology and Immunology at the University of Arkansas, Fayetteville where he received his Bachelor of Arts degree in Microbiology.  He received his Doctor of Pharmacy at the University of Arkansas for Medical Sciences, Little Rock in 1999 and his J.D. from Santa Clara University, Santa Clara, California in 2005.

Trey advises clients regarding the identification, development, and protection of their intellectual property assets, including trade secrets, patents, and trademarks.  He is also responsible for the patent portfolio direction and strategy for multiple large and multi-national clients, collaborating with foreign patent offices worldwide to effectively prosecute our client's patent interests in other jurisdictions.

Dr. Yarbrough has practiced Pharmacy for over 18 years and has held Pharmacy licenses in Arkansas, California and Texas.  Additionally, he has served as an adjunct Pharmacy Law Professor for the University of Houston College of Pharmacy since 2011 and has functioned as course co-coordinator.

As a patent attorney, Trey has worked in such varied fields as:

  • medical technology
  • pharmacology
  • pharmaceutics
  • drug development
  • chemotherapeutics
  • bioengineering
  • genetics
  • limb and tissue regeneration
  • human dietary supplements
  • veterinary dietary supplements
  • computer software
  • oil and gas
  • wind turbine technology
  • telecommunications
  • electrochemical desalination
  • pain management
  • cardiac defibrillation
  • mechanical devices
  • commercial fishing industries
  • recreational terminal tackle
  • fishing lures

William Yarbrough is licensed to practice Pharmacy in Arkansas and Texas.  He is licensed to practice Law in Texas and before the United States Patent and Trademark Office and is a member of the Houston Intellectual Property Association.  William is based in the Houston, Texas, office for Kearney, McWilliams & Davis, PLLC.



  • Yarbrough Law Firm: Owner, Managing Attorney
  • University of Houston College of Pharmacy: Co-Coordinator, Pharmacy Law Course
  • Pharmacist: Walgreens, Wal-mart