Granted Patent
Utility
US 3,933,202 · App. 05/516,173
Apparatus for setting and locking packing assemblies in wellheads
Inventor:
Arthur G. Ahlstone
Patented Case
View Patent ↗
Granted: Jan 20, 1976
Filed: Oct 21, 1974
Inventor
Arthur G. Ahlstone
Assignee (at issue)
Vetco Offshore Industries, Inc.
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.