Granted Patent
Utility
US 4,209,985 · App. 05/973,047
Transmission control system
Inventor:
Ralph E. Master
Patented Case
View Patent ↗
Granted: Jul 1, 1980
Filed: Dec 11, 1978
Inventor
Ralph E. Master
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.