Klausner Technologies has filed a lawsuit against HTC, claiming that HTC has infringed its Visual Voicemail patents.
The company owns 25 Visual Voicemail patents in the US, Canada, Europe, Taiwan, Korea and Japan.
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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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