Granted Patent
Utility
US 4,770,247 · App. 07/047,172
Subsea riser for multiple bore wells
Inventor:
Robert Lee Wilkins
Patented Case
View Patent ↗
Granted: Sep 13, 1988
Filed: May 7, 1987
Inventor
Robert Lee Wilkins
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.