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Litigated over 300 IPR & CBM cases and nearly 60 Federal Circuit appeals

In the last 12 years, highlights of Lowenstein & Weatherwax’s practice include being identified as one of the most active and top performing IPR firms in the country for the periods 2013-2018 and 2018-2023 by an independent third party, representing parties in over 300 IPR and CBM cases before the USPTO’s Patent Trial and Appeals Board, litigating nearly 60 Federal Circuit appeals, and obtaining a grant of certiorari and arguing before the United States Supreme Court.


Lowenstein & Weatherwax’s attorneys include seasoned litigators who are amongst the most experienced IPR litigators in the country.

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Lowenstein & Weatherwax 2023 News Round Up

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Lowenstein & Weatherwax LLP attorneys have significant expertise in IPR litigation, and have represented companies from a variety of technological areas, including semiconductors, computer hardware and software, medical device, pharmaceutical and biotechnology. Our attorneys have successfully represented numerous large and reputable companies, obtaining and defending against claims totaling billions of dollars on their behalf.


  • Patent Post-Grant (IPR)
  • Patent Litigation
  • Appellate

Patent Post-Grant (IPR)

L&W’s attorneys have represented patent owners in over 300 IPRs and CBMs, garnering a strong track record of success in high stakes matters against top notch competition.

Patent Litigation

L&W can and does litigate patents in virtually any technology. Its experienced attorneys have litigated intellectual property in such technologies as semiconductor packaging and microelectronics, digital video recorders, implantable heart valve repair products, video game controllers and distribution channels, pharmaceutical drugs and drug delivery, delivery, smartphone user interfaces, electronic commerce and a multitude of others.


L&W has litigated nearly 60 cases before the Federal Circuit and one in the United States Supreme Court

Efficiency & Experience

L&W’s success in IPR matters has been widely recognized. In 2018, Patexia identified L&W as being the best performing law firm in IPRs out of over 1100 law firms over the 2013-2018 time period. For the 2018-2023 period, Patexia identified L&W as the fifth most active and 16th best performing (out of over 800 firms) representing patent owners. L&W’s success is particularly notable as it is a small boutique that routinely litigates against some of the largest companies and law firms in the world.