Granted Patent
Utility
US 4,355,657 · App. 06/192,312
Pilot operated relief valve
Inventor:
Raymond G. Reip
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Sep 30, 1980
Inventor
Raymond G. Reip
Assignee (at issue)
VAPOR CORP.
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.