iPhone-maker Apple has filed a new complaint against top cellphone maker Nokia with the U.S. International Trade Commission (ITC), escalating a fierce legal battle. Lawyers and analysts have said the dispute between Apple and Nokia is likely to last for more than a year, with Nokia seeking payment of up to 1 billion euros ($1.45 billion). Following are the key developments in the case:

Nokia filed a suit in the United States in October, saying Apple iPhone had infringed 10 patents in technologies including wireless data transfer, a key factor in the success of iPhone. The suit accused Apple of trying to hitch a “free ride” on Nokia's technology investment.

APPLE COUNTERATTACK Apple filed a countersuit on Dec. 11 claiming that Nokia is infringing 13 Apple patents. “Other companies must compete with us by inventing their own technologies, not just by stealing ours,” Bruce Sewell, Apple's General Counsel, said in a statement. Nokia has until Feb. 8 to reply to the countersuit.

NOKIA GOES TO ITC On Dec. 29 Nokia said it had filed a complaint with the ITC alleging that Apple infringes seven Nokia patents in “virtually all of its mobile phones, portable music players, and computers” sold. At the same time Nokia also filed a case at a Delaware court seeking damages for infringement of these patents.

Apple filed on Jan. 15 a complaint against Nokia with the ITC. Nokia said it would defend itself vigorously.

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