Granted Patent
Utility
US 4,742,841 · App. 07/037,023
Water shut-off valve
Inventors:
Douglas B. Vonderhaar, Donald E. McGeachy
Patented Case
View Patent ↗
Granted: May 10, 1988
Filed: Apr 10, 1987
Inventors
Douglas B. Vonderhaar
Donald E. McGeachy
Assignee (at issue)
Numatics, Incorporated
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.