Granted Patent
Utility
US 4,971,963 · App. 07/323,915
Cephem compounds, and use
Inventors:
Michiyuki Sendai, Shoji Kishimoto
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Mar 15, 1989
Inventors
Michiyuki Sendai
Shoji Kishimoto
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.