USPTO Declares Invalid Third of Three Critical Rambus Patents

slew writes "This is a followup to this earlier story about 2 of 3 of Rambus's 'critical' patents being invalidated. Apparently now it's a hat-trick." There's something that seems unsavory and wasteful about a business environment in which a company's stock value "fluctuates sharply on its successes and failures in patent litigation and licensing." The linked article offers a brief but decent summary of the way Rambus has profited over the years from these now-invalidated patents.