Nuance alleges Vlingo infringed on its patents

Nuance Communications Inc., a Burlington maker of speech-recognition products, has sued the Cambridge start-up Vlingo Corp., alleging patent infringement. The lawsuit, filed in US District Court in Texas, seeks monetary damages and an order against any continued infringement. Vlingo, which develops speech-recognition technology for mobile phones, raised $20 million in April in a funding round led by Yahoo Inc. A spokesman would not say how much money Nuance's suit seeks. A Vlingo spokeswoman said only that the company is reviewing the lawsuit.