Granted Patent
Utility
US 4,742,874 · App. 07/044,582
Subsea wellhead seal assembly
Inventor:
Steven D. Gullion
Patented Case
View Patent ↗
Granted: May 10, 1988
Filed: Apr 30, 1987
Inventor
Steven D. Gullion
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.