The USPTO’s view on opinion testimony in patent interference cases has evolved over time. The MPEP 716.09 references a significant case that reexamined this issue: Glaser v. Strickland, 220 USPQ 446 (Bd. Pat. Int. 1983) which reexamines the rationale on which In re Oppenauer was based in light of the Federal Rules of Evidence. The…

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