Granted Patent
Utility
US 4,161,890 · App. 05/830,542
Friction drive contact zone
Inventors:
Alexander Goloff, Ralph E. Denning
Patented Case
View Patent ↗
Granted: Jul 24, 1979
Filed: Sep 6, 1977
Inventors
Alexander Goloff
Ralph E. Denning
Assignee (at issue)
Caterpillar Tractor Co.
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.