Granted Patent
Utility
US 4,337,787 · App. 06/197,832
Pressure regulating hydraulic circuit and valve
Inventor:
Sammy J. Rhodes
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: Mar 12, 1980
Inventor
Sammy J. Rhodes
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.