Ericsson has filed a patent action against Apple in Germany, the UK and the Netherlands relating to the use of 2G and 4G standards in products such as the iPhone.
Ericsson said that it had offered to enter into arbitration with Apple to try to reach an agreement on its standard-essential patents.
That offer has now expired, leading to this action, as Kasim Alfalahi, chief intellectual property officer at Ericsson, explained.
"Apple continues to profit from Ericsson's technology without having a valid licence in place,” he said.
“Our technology is used in many features and functionality of today's communication devices. We are confident the courts in Germany, the UK and the Netherlands will be able to help us resolve this matter in a fair manner."
Ericsson asserts patents against Apple in Germany, the UK and the Netherlands http://t.co/zN1ps9TIz2— Ericsson (@ericsson) May 8, 2015
Apple declined to comment on the developments.
The move comes after Apple and Ericsson filed lawsuits against each other in January, when Apple claimed that Ericsson was demanding excessive royalties for its patents.
Apple filed its claim in a court in California, and Ericsson responded with a complaint in a Texas district court arguing that its patent fees are fair.
"Litigation is always a last resort for us, but we believe it is reasonable to get fair compensation from companies benefiting from our technology development," Ericsson said at the time.
"We are asking the court to provide an independent ruling to confirm that the terms we have offered are fair, reasonable and non-discriminatory."
The filing is just one of many legal battles relating to technology patents over the past few years. This has seen many firms strike agreements to stave off such action, or buy and sell patents to boost their portfolios.
Google recently got in on the act by launching a patent purchasing platform in a bid to stop patent trolls taking on firms unable to defend themselves.
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