(Recasts first paragraph, adds further detail, background, share movement) By Peter Kaplan WASHINGTON, Nov 28 (Reuters) - A legal standard used to determine if patents are valid or merely "obvious" combinations of previous inventions that should be rejected, was criticized by U.S. Supreme Court justices on Tuesday. In a case with broad implications for the U.S. patent system, the justices repeatedly questioned whether appeals court judges were using the right standard to define ...
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