Finding a prima facie case of obviousness where the prior art tri-orthoester compound was found to be equivalent to the claimed tetra-orthoester compound and the use of the tri-orthoester as a fuel additive was expected to produce essentially the same result as the use of the tetra-orthoester
Holding that "[i]n evaluating obviousness, the hypothetical person of ordinary skill in the pertinent art is presumed to have the ability to select and utilize knowledge from other arts reasonably pertinent to particular problem to which the invention is directed
Affirming rejection where examiner took “[o]fficial notice of the existence in the art of such recording and re-recording steps” for copying the contents of one audio tape onto another
35 U.S.C. § 103 Cited 6,130 times 479 Legal Analyses
Holding the party seeking invalidity must prove "the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains."