Sun Advances Claims Allergan Misused Info to Prosecute Patents

Sun Pharmaceuticals’ claims that AbbVie Inc.'s Allergan unit misused confidential information to prosecute patents for a formulation of a drug used to treat irritable bowel syndrome will move forward, a federal court in Delaware ruled Thursday.

Allergan sued Sun for patent infringement in US District Court for the District of Delaware in 2019, on the heels of Sun filing a new drug application with the US Food & Drug Administration for a formulation of eluxadoline.

Sun countersued, claiming Allergan had unclean hands because it used information learned during the litigation with Sun to obtain new eluxadoline patents, which it then ...