Endo Pharms. Sols., Inc. v. Custopharm Inc., — F.3d —, 2018 U.S. App. LEXIS 19265 (Fed. Cir. 2018).
by Dennis Crouch
Endo’s injectable testosterone Aveed is listed in the Orange Book as being covered by Bayer’s U.S. Patent Nos. 7,718,640 and 8,338,395. Endo and Bayer sued Custopharm after it submitted an Abbreviated New Drug Application (ANDA) to produce a generic version. (Under 35 U.S.C. 271(e), submission of the ANDA is an act of infringement).
On appeal, the Federal Circuit has sided with the patentee — affirming the district court judgment of validity.
The claimed invention here requires the use of testosterone undecanoate (TU) at a concentration of 250 mg/ml in a vehicle containing a mixture of about 40% castor oil and 60% benzyl benzoate. (Claim 1 of the ‘640 patent). Three key prior art references are all research articles that report using the same concentration of TU and also the castor oil. The articles do not, however, actually report that benzyl benzoate was used — it turns out though that the researchers (including one overlapping listed inventor here) used the same 40/60 split of castor oil and benzyl benzoate.Continue Reading ...