Granted Patent
Utility
US 6,317,941 · App. 09/587,919
Security clutch
Inventor:
David Hamm
Patented Case
View Patent ↗
Granted: Nov 20, 2001
Filed: Jun 6, 2000
Inventor
David Hamm
Assignee (at issue)
B.A. BALLOU & CO. 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.