In a filing late Wednesday with the U.S. International Trade Commission, Sony said LG violated U.S. trade rules by importing mobile phones and modems that infringed Sony patents.
Sony said LG also infringed patents of some of its licensees, including its Sony Ericsson joint venture, Samsung and Nokia.
The company filed a related complaint with the federal court in Los Angeles, court records show. A copy of that complaint was not immediately available.
LG spokesman John Taylor said in an email that it is company policy not to discuss pending litigation.
Sony said the patent infringement relates to more than 10 phones including the Encore, LG Accolade, Neon, Quantum, Rumor Touch and others.
The patents in the suit involve audio and microphone devices in phones, caller ID technology and transmission power.
LG, South Korea's fourth-largest conglomerate, this month said it is trying to expand its major businesses, including smartphones, and on Tuesday said it wants to raise 2011 sales by 11 percent to 156 trillion won ($135 billion).
Since October, LG has sold 2 million units of the Optimus One smartphone, its most popular smartphone model to date.
Sony reported an operating profit of 68.7 billion yen ($847 million) in the three months ended September 30, reversing a loss the previous year.
The ITC case is In re: Certain Mobile Phones and Modems, U.S. International Trade Commission, No. 337-TA. The California case is Sony Corp. v. LG Electronics USA Inc. et al, U.S. District Court, Central District of California, No. 2:10-09967.
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