POSNER, Circuit Judge.
Peter Roberts, the owner of a patent for a quick-release socket wrench, sued Sears Roebuck for patent infringement. The jury found the patent valid and infringed and awarded Roberts $5 million in damages (later raised to more than $8 million), and Sears has appealed, arguing among other things that the patent is invalid because "the subject matter as a whole would have been obvious at the time the invention was made to a person having ordinary...
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