Granted Patent
Utility
US 4,909,277 · App. 07/296,955
Selectively indexed multiple orifice valve
Inventor:
Robert L. Vandiver
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Jan 17, 1989
Inventor
Robert L. Vandiver
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.