By Dominic Chopping and Juhana Rossi 

STOCKHOLM-- Ericsson AB said Friday it is suing Apple Inc. for infringing technology patents it says are critical to many aspects of the U.S. tech giant's popular mobile devices such as iPhones and iPads.

The Swedish telecom equipment supplier 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.

"Our last offer was to have this determination either in [a federal court in] Texas or in a court selected by Apple in California. They declined," said Gustav Brismark, head of patent strategy at Ericsson.

Ericsson and Apple had a licensing agreement which required Apple to pay royalties for its use of technology patented by Ericsson. The agreement, originally struck in 2008, expired in January.

Mr. Brismark told The Wall Street Journal that Ericsson is trying to negotiate a new licensing agreement which is based on the same principles as the previous agreement.

"We're seeking a fair resolution. We believe that the royalties that we're demanding are reflected in the value that our technology brings to these products," Mr. Brismark said.

Due to what Mr. Brismark called Apple's refusal to negotiate, Ericsson has now 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.

In January, Ericsson and Apple 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.

However, Apple characterized the royalties Ericsson has been asking for as "excessive" in a federal court filing linked to its dispute.

A spokesman for Apple on Friday referred to the company's statement in January. "We've always been willing to pay a fair price to secure the rights to standards essential patents covering technology in our products. Unfortunately, we have not been able to agree with Ericsson on a fair rate for their patents so, as a last resort, we are asking the courts for help," Apple said in a statement on Jan. 14.

Ericsson is seeking "to exploit its patents" to take value from Apple's "cutting-edge" innovations which cost billions of dollars in research and development and which have nothing to do with Ericsson's patents, Apple stated in a filing made to the U.S. District Court for the Northern District of California on January 12.

The lawsuit Ericsson disclosed on Friday concerns patents that 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.

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 on Friday.

Write to Dominic Chopping at dominic.chopping@wsj.com and Juhana Rossi at juhana.rossi@wsj.com

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