By Dominic Chopping 

STOCKHOLM-- Ericsson AB said Friday it is suing Apple Inc. for infringing 41 patents it says are critical to many aspects of the U.S. tech giant's devices.

The Swedish networking company said Apple had declined a licensing deal and refused an offer to have a court determine fair licensing terms by which both companies would be bound, so it has filed two complaints with the U.S. International Trade Commission, and seven complaints in the U.S. District Court for the Eastern District of Texas.

The patents in question relate to 2Q and 4G long-term evolution standards and features that Ericsson said are critical to the functionality of Apple devices.

Ericsson said the legal action is aimed at securing an exclusion order against Apple's products as well as damages and injunctions.

"By refusing Ericsson's fair and reasonable licensing offer for patented technology used in Apple smartphones and tablets, Apple harms the entire market and reduces the incentive to share innovation," the company said in a statement.

Only last month, the companies said they were suing each other in a dispute over royalties for patents linked to high-speed wireless technology. Ericsson said at the time it was taking the legal action in response to claims by Apple that the patents aren't "essential" for the LTE wireless communication standard. Apple also claimed that Ericsson was demanding excessive royalties for its LTE patents.

Kasim Alfalahi, chief intellectual property officer at Ericsson, said, "Apple's products benefit from the technology invented and patented by Ericsson's engineers."

"Apple currently uses our technology without a license and therefore we are seeking help from the court and the ITC."

Apple couldn't immediately be reached for comment Friday.

Write to Dominic Chopping at dominic.chopping@wsj.com

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