Concluding that a reference was not reasonably pertinent where a PHOSITA "would not reasonably have expected to solve the [relevant] problem ... by considering" that reference
Finding that reference in the patent's specification to a field of art encompassing the alleged prior art supported a finding that the alleged prior art was within the inventor's field of endeavor.
Stating "[t]he test for obviousness is not whether the features of a secondary reference may be bodily incorporated into the structure of the primary reference"
Finding that if a prior art reference discloses essentially the same structure and function as the invention, it is likely in the same field of endeavor
Holding that a broad claim requiring selecting a backing board having a length at least as long as six shingles is not supported by a specification contemplating only backing boards the length of eight or sixteen shingles