Granted Patent
Utility
US 5,203,809 · App. 07/803,220
Self-tightening clamp
Inventor:
Hans Oetiker
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Dec 6, 1991
Inventor
Hans Oetiker
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.