Granted Patent
Utility
US 4,037,622 · App. 05/205,500
Diaphragm reversing valve
Inventors:
Gene W. Osheroff, Laurence McGann
Patented Case
View Patent ↗
Granted: Jul 26, 1977
Filed: Dec 7, 1971
Inventors
Gene W. Osheroff
Laurence McGann
Assignee (at issue)
McQuay-Perfex Inc.
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.