Granted Patent
Utility
US 4,672,827 · App. 06/669,538
Disc tumbler lock with removable plug
Inventor:
Clark E. Craig
Patented Case
View Patent ↗
Granted: Jun 16, 1987
Filed: Nov 8, 1984
Inventor
Clark E. Craig
Assignee (at issue)
Keycon Hardware Products, 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.