Granted Patent
Utility
US 6,657,057 · App. 10/130,797
Process for production of methylcobalamin
Inventors:
Yoshihiko Hisatake, Hiroshi Kuroda
Patented Case
View Patent ↗
Granted: Dec 2, 2003
Filed: May 23, 2002
Inventors
Yoshihiko Hisatake
Hiroshi Kuroda
Assignee (at issue)
Eisai Inc.
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.