"On February 17, 2012, the company received a letter from the European Commission notifying it that the Commission has received a complaint against Motorola Mobility, Inc. by Apple, Inc. regarding the enforcement of MMI's standards-essential patents against Apple allegedly in breach of MMI's FRAND (fair and reasonable) commitments," Motorola Mobility said in a regulatory filing on Friday.
"Apple's complaint seeks the Commission's intervention with respect to standards-essential patents," it said.
Motorola Mobility won a preliminary injunction against Apple in Germany in December last year. The company accused the iPhone maker of infringing its technology patents in a Florida court last month.
Last week Google secured EU and U.S. approval to acquire Motorola Mobility for its portfolio of patents.
The European Commission is now investigating whether legal tactics used by Samsung against Apple breaches EU antitrust rules.