Granted Patent
Utility
US 4,390,041 · App. 06/233,860
Pilot operated relief valve
Inventor:
Raymond G. Reip
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: Feb 17, 1981
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.