Granted Patent
Utility
US 4,279,746 · App. 06/114,029
Hydraulic fluid filter and bypass valve
Inventor:
Donald C. Leutz
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: Jan 21, 1980
Inventor
Donald C. Leutz
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.