Granted Patent
Utility
US 5,321,506 · App. 07/715,935
Automatic screw-on pipe couplings
Inventor:
William Boyd Sargent
Patented Case
View Patent ↗
Granted: Jun 14, 1994
Filed: Jun 14, 1991
Inventor
William Boyd Sargent
Assignee (at issue)
USX 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.