Granted Patent
Utility
US 4,266,446 · App. 06/027,197
High torque infinitely variable traction drive transmission
Inventor:
Joseph E. Fritsch
Patented Case
View Patent ↗
Granted: May 12, 1981
Filed: Apr 5, 1979
Inventor
Joseph E. Fritsch
Assignee (at issue)
Massey Ferguson Group Limited
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.