Granted Patent
Utility
US 4,693,685 · App. 06/795,999
Gear ratio step-down or step-up device for dental handpiece
Inventor:
Jacques Pernot
Patented Case
View Patent ↗
Granted: Sep 15, 1987
Filed: Nov 7, 1985
Inventor
Jacques Pernot
Assignee (at issue)
Micro Mega, S.A.
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.