Identity Requirement vs Inherent Anticipation
a.    Identity Requirement: Anticipation can only be established by a single prior art reference which discloses each and every element of the claimed invention. (Structural Rubber Products 5).
- Claim interpretation: This makes claim interpretation as important for anticipation as it is for
infringement (C5P23)
b.    Inherent Anticipation: To establish, extrinsic evidence must make clear that the missing descriptive matter is necessarily present in the thing described in the reference, and that it would be so recognized by persons skilled in the art. (In Re Robertson, Graves, Schreiber)
- Idea: The elements of the prior art may be described so that they seem quite different from
elements of the patent in question. Have to interpret prior art to see what elements were disclosed.