Granted Patent
Utility
US 5,664,939 · App. 08/508,393
Circulator pump check valve
Inventors:
Attilio G. Giordani, Richard A. Genga, Jr.
Patented Case
View Patent ↗
Granted: Sep 9, 1997
Filed: Jul 31, 1995
Inventors
Attilio G. Giordani
Richard A. Genga, Jr.
Assignee (at issue)
TACO, 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.