Evans explains that “[a]n ongoing challenge in the field of gene therapy and vaccine research is to generate liquid virus formulations which are stable for longer periods of time within a useful temperature range.” Id. at 1:16– 19, 28–30.
Indeed, “no signs of settling or precipitation” were observed for prior art adenovirus compositions stored in a high ionic strength buffer over a 7-day period (Ex.1009, [00369]), and a POSA would have understood that AAV “is significantly more stable than the adenovirus” used in Liu (Ex.1013, 1283); Ex.1025, ¶¶197-198.
Patent Owner contends that [Petitioner] fails to establish that the POSA would have been motivated to develop a composition comprising an rAAV “concentration exceeding 1x1013 vg/ml,” “one or more multivalent ions selected from … citrate, sulfate, magnesium, and phosphate,” with an ionic strength “greater than 200mM.” [Ex. 2004] ¶¶ 75–79.
To prove inherency in the context of obviousness “[a] party must ... meet a high standard ... the limitation at issue necessarily must be present, or the natural result of the combination of elements explicitly disclosed by the prior art.” PAR Pharm., Inc. v. TWI Pharms., Inc., 773 F.3d 1186, 1195– 96 (Fed. Cir. 2014).
Petitioner fails to submit any evidence that the particle radius and product recovery elements of claims 5 and 6, respectively, would necessarily be present, or the natural result of the combination of teachings explicitly disclosed by Evans, Huang, and Mingozzi.