Apple has filed a lawsuit against HTC, claiming that HTC has infringed a number of Apple patents related to the iPhone's user interface, underlying architecture and hardware.
The lawsuit has been filed with the US District Court in Delaware and also with the US International Trade Commission, which has the power to block imports of HTC devices if it rules in Apple's favour.
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Nokia has followed up its recent legal action against Apple by filing a complaint with the USA's International Trade Commission.
It alleges that Apple infringes seven Nokia patents in almost all of its mobile phones, portable music players and computers.
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