Granted Patent
Utility
US 4,354,527 · App. 06/261,094
Control system for pilot operated valve
Inventor:
William D. McMillan
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Oct 9, 1980
Inventor
William D. McMillan
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.