Granted Patent
Utility
US 5,052,981 · App. 07/503,892
Variable diameter pulley with centrifugal weights
Inventor:
Jean-Francois Robert
Patented Case
View Patent ↗
Granted: Oct 1, 1991
Filed: Apr 4, 1990
Inventor
Jean-Francois Robert
Assignee (at issue)
Powerbloc IBC Canada 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.