September 11, 2025 (Santa Monica, CA)

Lowenstein & Weatherwax LLP again dominated the IPR rankings in Patexia’s PTAB 2025 Intelligence Report released September 11, 2025 and covering the period July 2020 – June 2025.  Highlights of the report include:

  • Founding partner Nathan Lowenstein being identified as the nation’s #1 best performing patent owner side IPR attorney out of 3,833 attorneys.  Lowenstein was also the most active of the top 15 best performing attorneys. 
  • L&W was ranked as the #6 best performing and #6 most active law firm representing patents owners in IPR proceedings (out of 703 law firms).
  • L&W’s partners Kenneth Weatherwax and Parham Hendifar were also identified amongst the best performing and most active patent owner side attorney with Colette Woo also being ranked amongst the best performing attorneys.