Granted Patent
Utility
US 4,569,366 · App. 06/390,185
Position indicator for rising stem valve
Inventors:
Michael D. West, Andrew W. Channell
Patented Case
View Patent ↗
Granted: Feb 11, 1986
Filed: Jun 21, 1982
Inventors
Michael D. West
Andrew W. Channell
Assignee (at issue)
International Telephone and Telegraph 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.