Granted Patent
Utility
US 4,775,133 · App. 07/109,653
Electric air valve
Inventors:
H. Kenneth Ring, Dennis L. Manthei, Steven C. Weber
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Oct 19, 1987
Inventors
H. Kenneth Ring
Dennis L. Manthei
Steven C. Weber
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.