Posts Tagged: "US Patent No. 8859741"

When Post-Filing Evidence to Determine Written Description Support Is Admissible: Amgen v. Sanofi

May a court rely on post-priority-date evidence offered to show that a patent lacks written description support even though written description is judged based on the state of the art as of the priority date?  Yes, at least when the evidence relates to whether or not a claimed genus discloses a representative number of species.  Amgen v. Sanofi No. 2017-1480 slip op. Fed. Cir. Oct. 5, 2017 (“Amgen”).   Such evidence, the Federal Circuit observed, is likely to postdate the priority date, because were it to predate, it might be anticipatory.  To consider such evidence is therefore a matter of “common-sense,” the Court added.