Granted Patent
Utility
US 5,632,170 · App. 08/575,593
Combination lock preventing manipulation for unauthorized access
Inventor:
Walter R. Evans
Patented Case
View Patent ↗
Granted: May 27, 1997
Filed: Dec 20, 1995
Inventor
Walter R. Evans
Assignee (at issue)
Ilco Unican 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.