The Denver Post - - BUSINESS -

Qual­comm Inc. is su­ing Ap­ple Inc. for patent in­fringe­ment, the lat­est vol­ley in an in­creas­ingly bit­ter le­gal bat­tle over whether Ap­ple should pay for Qual­comm tech­nol­ogy used in the iPhone.

The chip­maker claims that Ap­ple in­fringes six patents cov­er­ing var­i­ous as­pects of mo­bile phone tech­nol­ogy. Qual­comm is also ask­ing the U.S. In­ter­na­tional Trade Com­mis­sion in Wash­ing­ton to stop ver­sions of the iPhone that aren’t built with its chips from en­ter­ing the coun­try.

Qual­comm’s le­gal strat­egy has two aims: in­crease pres­sure on Ap­ple to pay up, and demon­strate that the San Diego-based chip­maker still makes cut­ting-edge tech­nol­ogy rather than milk­ing old in­ven­tions, as Ap­ple has charged.

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