Granted Patent
Utility
US 4,281,676 · App. 05/884,675
Pressure modulating selector valve
Inventor:
Hugh C. Morris
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: Mar 8, 1978
Inventor
Hugh C. Morris
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.