Apple faces litigation claiming that it's using patented technology all the time, often from small patent holding companies with dollar signs in their eyes. Noise Free Wireless has just filed a patent lawsuit against Apple whose allegations are considerably, well, louder. The firm maintains that it had been pitching its patented noise cancellation to Apple in periodic meetings between 2007 and 2010, only to watch as 1 Infinite Loop used Audience's technology for the iPhone 4 instead -- and supposedly handed some of Noise Free's work to a competitor. An Apple patent filed the same year borrows some of that work, Noise Free insists, in addition to the iPhone in question. Neither side is talking about the details to outlets like Macworld, although we'd be cautious about accepting either company's position at face value. However much Apple may protest its innocence regardless of circumstances, Noise Free certainly has a vested interest in retribution after losing out on such a big contract.