The US Court of Appeals for the Federal Circuit endorsed for the first time the “all substantial rights” test to determine whether inventions are commonly owned for purposes of obviousness-type double patenting validity analysis of a later patent. Immunex Corp. v. Sandoz, Inc., Case No. 20-1037 (Fed. Cir. July 1, 2020) (O’Malley, J.) (Reyna, J., dissenting). The Court determined that patents were not commonly owned—and therefore a later patent was not invalid for obviousness-type double patenting—when the patentee retained a secondary right to sue for infringement and the right to “veto” further assignment of the patents by the grantee.

Roche licensed a family of patent applications to Immunex. Under the license agreement, Immunex agreed to pay a running royalty to Roche based on sales of products incorporating the patented technology. Non-party Amgen subsequently acquired Immunex. Amgen, Immunex and Roche entered into an agreement to eliminate the continuing royalties to Roche. The agreement granted to Immunex a paid-up, irrevocable, exclusive license to the US patent family for the patents-in-suit and gave Immunex the sole right to sublicense. It further granted Immunex the exclusive right to prosecute applications in the US patent family. Critically, Roche retained the secondary right to assert the patents if Immunex did not assert them in litigation after being informed of potential infringement, and the right to veto any downstream assignment by Immunex to a third party.

Immunex and Roche later sued Sandoz for infringing a patent included in the license agreement. At trial, Sandoz argued that the patents-in-suit were invalid for obviousness-type double patenting over several patents filed by Immunex.

The judicially created doctrine of obviousness-type double patenting prohibits claims in a second patent that, while not for the same invention, are so similar to the claims of a commonly owned earlier patent that granting both patents exclusive rights would “effectively extend the life of patent protection.” This doctrine rests primarily on two justifications: preventing unjustified extension of the time of the right to exclude, and preventing multiple infringement suits by different assignees. The doctrine applies to all commonly owned patents, including cases in which the obvious variant inventions have different inventors.

Urging a novel theory of common ownership, Sandoz argued that although the patents-in-suit were assigned to Roche, Immunex effectively owned both the Immunex patents and the patents-in-suit. Sandoz asserted that the agreement between Amgen, Immunex and Roche conveyed “all substantial rights” in the patents-in-suit, which was tantamount to an assignment of ownership. Thus, Sandoz argued that the “all substantial rights” test, which previously had only been used to determine who had standing to sue for infringement as a “patentee” under 35 USC § 281, should apply in the context of obviousness-type double patenting.

Immunex argued that the “common ownership” analysis should take into account ownership at the time of invention, such that common-ownership-based obviousness-type double patenting arises only where the relevant inventions were owned by the same entity.

The Federal Circuit agreed with Sandoz, endorsing for the first time the all substantial rights test to [...]

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