Granted Patent
Utility
US 4,474,203 · App. 06/528,836
Valve with pressure energized back seat sealing means
Inventor:
Danny S. Meyer
Patented Case
View Patent ↗
Granted: Oct 2, 1984
Filed: Sep 2, 1983
Inventor
Danny S. Meyer
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.