Is there a step between ‘inventive’ and ‘nonobviousness’?

US law requires a patented invention be nonobvious, ie, a patent may not be obtained “if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious … to a person having ordinary skill in the art to which the claimed invention pertains.” 35 U.S.C. 103.

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Is there a step between ‘inventive’ and ‘nonobviousness’?

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