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THE U.S. PATENT and Trademark Office has confirmed the validity of a Xerox software patent, clearing the way for Xerox to pursue a patent infringement case against 3Com. The lawsuit alleges that the handwriting-recognition software used in 3Com's Palm devices belongs to Xerox.
In January 1997, Xerox received the patent for Unistrokes, a handwriting technology that allows users to input information into a computer by printing letters in a special shorthand. Three months later, Xerox sued U.S. Robotics (later purchased by 3Com) in U.S. District Court, in Rochester,…