Granted Patent
Utility
US 6,223,439 · App. 09/363,007
Utility knife with quick action quarter-turn connector
Inventor:
Jeffrey W. Wonderley
Patented Case
View Patent ↗
Granted: May 1, 2001
Filed: Jul 30, 1999
Inventor
Jeffrey W. Wonderley
Assignee (at issue)
American Safety Razor
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.