Biogen International GmbH v. Banner Life Sciences, LLC, No. 20-1373 (Fed. Cir. 2020)
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Biogen holds the New Drug Application for the active ingredient dimethyl fumarate (DMF), which was FDA-approved in 2013 as Tecfidera®, a twice-daily pill for the treatment of relapsing forms of multiple sclerosis at a daily dose of 480 mg. The 001 patent, “Utilization of Dialkylfumarates,” discloses that dialkyl fumarates may have therapeutic uses “in transplantation medicine and for the therapy of autoimmune diseases,” including multiple sclerosis. After the five-year data exclusivity for Tecfidera® expired, Banner submitted an application under 21 U.S.C. 355(b)(2) to market a twice-daily monomethyl fumarate (MMF) pill at a daily dose of 380 mg. Biogen alleged infringement of the 001 patent. Banner argued that section 156(b)(2) limits the scope of the patent’s extension to methods of using the approved product as defined in 156(f)—DMF, its salts, or its esters—and that MMF is none of those things. Biogen responded that section 156(b)(2) limits extension only to uses of any product within the original scope of the claims. The patent will expire in June 2020.
The Federal Circuit affirmed the district court’s finding of non-infringement. The monomethyl ester, covered by claim 1, is not covered by the extension. The scope of a patent term extension under 35 U.S.C. 156 only includes the active ingredient of an approved product, or an ester or salt of that active ingredient; the product at issue does not fall within those categories.
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