Aragen Bioscience, Inc. and Transposagen Biopharmaceuticals, Inc. have filed three petitions for IPR of Kyowa Hakko Kirin Co., Ltd.’s patents: IPR2017-01262 on U.S. Patent 7,425,446; IPR2017-01252 on U.S. Patent 6,946,292; and IPR2017-01254 on U.S. Patent 8,067,232. According to the petitions, the challenged claims are “directed to an isolated mammalian host…
