Granted Patent
Utility
US 4,312,201 · App. 06/071,666
Cylinder lock with force-immune knob
Inventor:
William G. Roos
Patented Case
View Patent ↗
Granted: Jan 26, 1982
Filed: Aug 31, 1979
Inventor
William G. Roos
Assignee (at issue)
Best Lock 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.