Granted Patent
Utility
US 3,982,469 · App. 05/651,890
Apparatus for controlling work element operating pressures in a fluid system
Inventor:
Donald L. Bianchetta
Patented Case
View Patent ↗
Granted: Sep 28, 1976
Filed: Jan 23, 1976
Inventor
Donald L. Bianchetta
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.