Granted Patent
Utility
US 4,298,067 · App. 06/120,851
Method and apparatus for installing multiple pipe strings in underwater wells
Inventor:
John E. Lawson
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Feb 11, 1980
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.