The group that owns thousands of former Nortel patents filed a barrage of lawsuits on Thursday against mobile phone manufacturers including Google, the company it outbid in the Nortel bankruptcy auction.
Rockstar, the consortium that bought the Nortel patents for $4.5bn (£2.8bn), sued Samsung Electronics, HTC, Huawei and four other companies for alleged infringement in the US district court in Texas. Rockstar is jointly owned by Apple, Microsoft, Blackberry, Ericsson and Sony.
Google is accused of infringing seven patents. The patents cover technology that helps match internet search terms with relevant advertising, the lawsuit said, which is the core of Google's search business.
A Google spokesman declined to comment. Representatives for Samsung, Huawei, HTC and Rockstar could not immediately be reached.
Samsung, Huawei and HTC all manufacture phones that run Google's Android operating system, which competes fiercely with Apple and Microsoft mobile products.
In 2011, Google placed an initial $900m bid for Nortel's patents. The company increased its bid several times, ultimately offering as much as $4.4bn.
After losing out to Rockstar, Google went on to acquire Motorola Mobility for $12.5bn, a deal driven partly by Motorola's library of patents.
"Despite losing in its attempt to acquire the patents-in-suit at auction, Google has infringed and continues to infringe," the lawsuit said.
Rockstar is seeking increased damages against Google, as it claims the firm's patent infringement is willful, according to the complaint.