Suing's easy. It's the "winning" that trips folks up. Such is the case with Rambus, who has been relying oh-so-heavily on the so-called trio of Barth patents to actively pursue just about every technology company on the planet. For those unaware, Rambus has christened itself as a "technology licensing company," but with the last of three patents used to win infringement suits against NVIDIA and HP being declared invalid, it's probably scrambling for new tactics. According to a Reuters report, an appeals board at the US Patent and Trademark Office declared the patent invalid a few days back, with the previous two being knocked back in September. A couple of months back, Rambus' stock lost 60 percent of its value after a court decision led to the loss of a $4 billion antitrust lawsuit against Micron and Hynix, and we're guessing things won't be any happier when the markets open back up on Monday. The company's next move? "We're evaluating our options," said spokeswoman Linda Ashmore.

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US government rules three Barth patents invalid, sends Rambus scrambling