Granted Patent
Utility
US 4,439,924 · App. 06/318,386
Rotary hand knife
Inventor:
Louis A. Bettcher
Patented Case
View Patent ↗
Granted: Apr 3, 1984
Filed: Nov 5, 1981
Inventor
Louis A. Bettcher
Assignee (at issue)
Bettcher Industries, 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.