Granted Patent
Utility
US 4,422,473 · App. 06/299,364
Tank ball valve having depending sleeve and handle attached to the sleeve
Inventor:
Richard B. Polley
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Sep 4, 1981
Inventor
Richard B. Polley
Assignee (at issue)
ACF Industries Incorporated
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.