Granted Patent
Utility
US 4,884,590 · App. 07/279,638
Electric motor driven air valve
Inventors:
David H. Eber, H. Kenneth Ring
Patented Case
View Patent ↗
Granted: Dec 5, 1989
Filed: Dec 5, 1988
Inventors
David H. Eber
H. Kenneth Ring
Assignee (at issue)
American Standard 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.