Granted Patent
Utility
US 4,492,251 · App. 06/334,418
Fluid control system for two independent actuators
Inventor:
William W. Blake
Patented Case
View Patent ↗
Granted: Jan 8, 1985
Filed: Dec 24, 1981
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.