Immunex Corp v. Sanofi-Aventis U.S. LLC, No. 19-1749 (Fed. Cir. 2020)Annotate this Case
Immunex’s 487 patent is directed to antibodies that bind to the human interleukin-4 receptor, the resulting inhibition of which is significant for treating various inflammatory disorders, such as arthritis, dermatitis, and asthma. Amid infringement litigation, Sanofi filed three inter partes review (IPR) petitions challenging claims 1–17 of the patent. Two were instituted. In one final written decision, the Board concluded that claims 1–17 were unpatentable as obvious over two prior references. Immunex appealed, contesting the construction of the claim term “human antibodies.” In the other IPR, involving a subset of the same claims, the Board did not invalidate the patents for reasons of inventorship. Sanofi contested the Board’s inventorship determination. In consolidated appeals, the Federal Circuit upheld the Board’s claim construction, affirming the invalidity decision, leaving valid no claims at issue in the inventorship appeal.