Granted Patent
Utility
US 4,583,624 · App. 06/679,723
Fluid system with selective differential pressure control
Inventor:
William W. Blake
Patented Case
View Patent ↗
Granted: Apr 22, 1986
Filed: Dec 10, 1984
Inventor
William W. Blake
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.