Patent lawsuits keep pressure on phone-makers, software firms:

Smartphone-makers are facing more litigation over alleged patent violations. NTP, which forged a $600 million settlement with Research in Motion, on Thursday sued six more companies in federal court -- Apple, Google, Microsoft, HTC, LG Electronics and Motorola -- alleging that e-mail systems on their handsets violate the company's patents. Also, the U.S. International Trade Commission has begun an inquiry into complaints from FlashPoint Technology against RIM, LG, Nokia and HTC over patents covering digital cameras.

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