Granted Patent
Utility
US 5,101,649 · App. 07/431,034
Key-operable lock with removable plug
Inventor:
Robert A. Duval
Patented Case
View Patent ↗
Granted: Apr 7, 1992
Filed: Nov 2, 1989
Inventor
Robert A. Duval
Assignee (at issue)
RAD Lock, 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.