Granted Patent
Utility
US 4,640,146 · App. 06/488,495
Multiratio constant mesh change speed transmission
Inventor:
John Buback
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Apr 25, 1983
Inventor
John Buback
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.