Granted Patent
Utility
US 5,048,751 · App. 07/509,877
Pressure and temperature relief valve and diaphragm valve
Inventor:
Chester G. DuBois
Patented Case
View Patent ↗
Granted: Sep 17, 1991
Filed: Apr 16, 1990
Inventor
Chester G. DuBois
Assignee (at issue)
Outboard Marine 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.