Granted Patent
Utility
US 4,427,072 · App. 06/380,910
Method and apparatus for deep underwater well drilling and completion
Inventor:
John E. Lawson
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: May 21, 1982
Inventor
John E. Lawson
Assignee (at issue)
Armco 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.