Granted Patent
Utility
US 4,736,799 · App. 07/003,117
Subsea tubing hanger
Inventor:
Arthur G. Ahlstone
Patented Case
View Patent ↗
Granted: Apr 12, 1988
Filed: Jan 14, 1987
Inventor
Arthur G. Ahlstone
Assignee (at issue)
Cameron Iron Works USA, 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.