Granted Patent
Utility
US 6,189,347 · App. 09/390,237
Training handcuff key
Inventor:
Charles E. Thompson
Patented Case
View Patent ↗
Granted: Feb 20, 2001
Filed: Sep 3, 1999
Inventor
Charles E. Thompson
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.