The U.S. International Trade Commission on Friday launched an investigation against the company Nokia to Apple's claim of alleged patent infringement. Independent lawyers say that the two technology giants continue to play the patent map on the background of growing competition between Nokia and Apple in the market of mobile devices.

Companies started the legal fight last October, after Nokia filed a lawsuit against Apple, accusing the manufacturer of the iPhone in the use of patented technology without the appropriate authorization and payment. Apple said Nokia counterclaim, also accusing the Finnish mobile giant of violating its patents. The U.S. company has filed a complaint with the Commission on International Trade in the U.S..

Apple insists in its lawsuit to block sales of some models of Nokia handsets in the U.S.. The Apple claim that Nokia violates the 9 patents. According to the procedure, the claim will be considered one of the six core committees of the Commission, as a consequence of itself can last for 45 days.

The Nokia said that while the suit Apple, the commission will consider the claim and Nokia, which are called the seven disputed patents.

Both parties rely on each other not only ban sales of smartphones in the U.S. market, but also the payment of millions of royalties.