Granted Patent
Utility
US 4,513,764 · App. 06/498,746
Valve
Inventor:
John H. Yonker
Patented Case
View Patent ↗
Granted: Apr 30, 1985
Filed: May 27, 1983
Inventor
John H. Yonker
Assignee (at issue)
Otis Engineering Corporation
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.