Granted Patent
Utility
US 4,535,968 · App. 06/552,446
Valve
Inventors:
John C. Gano, Gary Allen Kohn
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Nov 16, 1983
Inventors
John C. Gano
Gary Allen Kohn
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.