Granted Patent
Utility
US 4,366,672 · App. 06/252,647
Pilot operated hydraulic device
Inventors:
Leslie M. Claar, John G. Russell
Patented Case
View Patent ↗
Granted: Jan 4, 1983
Filed: Apr 9, 1981
Inventors
Leslie M. Claar
John G. Russell
Assignee (at issue)
Parker-Hannifin Corporation
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.