Granted Patent
Utility
US 4,355,565 · App. 06/206,192
Fluid circuit with zero leak load check and by-pass valve
Inventor:
Donald L. Bianchetta
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Mar 24, 1980
Inventor
Donald L. Bianchetta
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.