Granted Patent
Utility
US 4,637,236 · App. 06/619,936
Key and retainer card combination
Inventor:
Donald F. Almblad
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Jun 12, 1984
Inventor
Donald F. Almblad
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.