Granted Patent
Utility
US 4,283,402 · App. 06/062,828
6-N-Heterocyclyl-3-tetrazolyl-penicillins
Inventor:
John Hannah
Patented Case
View Patent ↗
Granted: Aug 11, 1981
Filed: Aug 1, 1979
Inventor
John Hannah
Assignee (at issue)
MERCK & CO., 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.