Granted Patent
Utility
US 4,381,646 · App. 06/261,101
Torque and high pressure limiting control for variable displacement pumps
Inventors:
Walter Z. Ruseff, James E. Schimpf
Patented Case
View Patent ↗
Granted: May 3, 1983
Filed: Sep 12, 1980
Inventors
Walter Z. Ruseff
James E. Schimpf
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.