Granted Patent
Utility
US 5,085,246 · App. 07/527,044
Plural-rate surge-suppressing valve
Inventor:
Ralph E. Griinke
Patented Case
View Patent ↗
Granted: Feb 4, 1992
Filed: May 22, 1990
Inventor
Ralph E. Griinke
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.