Granted Patent
Utility
US 4,996,313 · App. 07/438,622
Penicillins
Inventor:
Jack E. Baldwin
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Nov 17, 1989
Inventor
Jack E. Baldwin
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT CORPORATION
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.