Granted Patent
Utility
US 4,887,672 · App. 07/285,585
Subsea wellhead with annulus communicating system
Inventor:
Joseph H. Hynes
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: Dec 16, 1988
Inventor
Joseph H. Hynes
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.