Granted Patent
Utility
US 4,341,073 · App. 06/089,126
Control circuit for variable displacement pumps with override valve
Inventor:
William J. Spivey, Jr.
Patented Case
View Patent ↗
Granted: Jul 27, 1982
Filed: Jun 13, 1979
Inventor
William J. Spivey, Jr.
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.