Granted Patent
Utility
US 4,586,528 · App. 06/708,481
Air release valve
Inventors:
Lewis B. Andres, Robert L. Esvang, Jr., Ralph N. Di Lorenzo
Patented Case
View Patent ↗
Granted: May 6, 1986
Filed: Mar 5, 1985
Inventors
Lewis B. Andres
Robert L. Esvang, Jr.
Ralph N. Di Lorenzo
Assignee (at issue)
APCO Valve and Primer 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.