Granted Patent
Utility
US 4,428,212 · App. 06/309,564
Cylinder lock retractor and chassis assembly
Inventors:
Walter E. Best, William R. Foshee
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Oct 8, 1981
Inventors
Walter E. Best
William R. Foshee
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.