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DTL Says Phone Cos. Infringe Transducer Patent

Law360 (December 11, 2007, 12:00 AM EST) -- Patent-holding company Digital Technology Licensing LLC on Monday accused Motorola Inc., Sprint Nextel Corp., Verizon Wireless and T-Mobile USA Inc. of infringing one of its patents on signal encoding technology used in cell phones.

The so-called '799 patent describes a device known as a digital output transducer, which can convert an analog input from a microphone, such as a human voice, into a digital signal.

DTL made the allegations in its answer to a complaint filed by Motorola in the U.S. District Court for the Southern...
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