Granted Patent
Utility
US 5,200,404 · App. 07/670,863
3-tetrazolylthiomethyl cephalosporin antibiotics
Inventor:
Frederick H. Jung
Patented Case
View Patent ↗
Granted: Apr 6, 1993
Filed: Mar 18, 1991
Inventor
Frederick H. Jung
Assignee (at issue)
ICI Pharma
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.