Katz Sues Companies Over Call Systems Patents

By Elaine Chow (June 11, 2007, 12:00 AM EDT) -- A slew of companies—including Exxon Mobil Corp., Continental Airlines Inc. and United Parcel Service Inc.—were hit on Thursday with patent infringement suits filed by Ronald A. Katz, whose extensive telecommunications patent portfolio has already earned the inventor over $1 billion....

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