Granted Patent
Utility
US 4,572,549 · App. 06/525,637
Subsea pipelines
Inventor:
Derek Sidwell
Patented Case
View Patent ↗
Granted: Feb 25, 1986
Filed: Aug 23, 1983
Inventor
Derek Sidwell
Assignee (at issue)
Cameron Iron Works, 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.