Granted Patent
Utility
US 5,583,216 · App. 07/462,492
Methods for the manufacture of cephems
Inventors:
Michihiko Ochiai, Taiiti Okada, Osami Aki, Akira Morimoto, Kenji Kawakita, Yoshihiro Matsushita
Patented Case
View Patent ↗
Granted: Dec 10, 1996
Filed: Jan 8, 1990
Inventors
Michihiko Ochiai
Taiiti Okada
Osami Aki
Akira Morimoto
Kenji Kawakita
Yoshihiro Matsushita
Assignee (at issue)
Takeda Chemical Industries Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.