Granted Patent
Utility
US 4,989,791 · App. 07/464,628
Valve nozzle assembly
Inventor:
Ralph G. Ridenour
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Jan 3, 1990
Inventor
Ralph G. Ridenour
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.