Granted Patent
Utility
US 5,188,568 · App. 07/644,552
Speed variator pulley provided with a reduced friction, removable rings
Inventor:
Eric Gourdon
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Jan 23, 1991
Inventor
Eric Gourdon
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.