Gibson Dunn Secures Complete Victory for Cisco and Duo in Patent Infringement Case
Firm News | June 17, 2025
A Gibson Dunn team recently secured a complete jury verdict in favor of our clients Cisco and Duo, defeating all claims brought by CosmoKey, which had alleged patent infringement related to verification technology. CosmoKey asserted a single patent and sought nearly $140 million in damages, along with a running royalty.
Following a five-day trial, the jury returned a verdict for our clients on all grounds, including of non-infringement, prior commercial use by defendants, and invalidity of the patent.
This is believed to be only the second-ever verdict of prior commercial use under 35 U.S.C. § 273(a) since its enactment more than a decade ago. The first occurred earlier in 2025, also with partner Brian Rosenthal as lead counsel. This marks Cisco’s third consecutive patent trial victory in 2025 with Brian as lead counsel, following wins in January and February.
Our trial team included partner Jaysen Chung and associates Nathan Scharn, Yana Nebuchina, Erin Kim, and Julian Manasse-Boetani