Granted Patent
Utility
US 4,476,934 · App. 06/527,927
Retractable stinger purge valve
Inventor:
Albert M. Regan
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Aug 30, 1983
Inventor
Albert M. Regan
Assignee (at issue)
Hughes Tool Company LLC
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.