ADT LLC and Comcast Broadband Security infringed a home surveillance patent with technology in their respective smart home security products, two lawsuits allege.

Varatec LLC accused the companies of infringing U.S. Patent No. 7,792,256, which covers a system for remote monitoring and controlling of one or more premises, in two separate U.S. District Court for the Northern District of Illinois lawsuits filed March 4.

Comcast allegedly infringed the patent with its Xfinity Home security management app. ADT allegedly infringed with its ADT Pulse app, which allows users to remotely monitor their home and manage security devices like locks and alarm...