Granted Patent
Utility
US 4,421,139 · App. 06/266,762
Plug for offshore platforms and the like
Inventor:
R. Benton Nickles
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: May 26, 1981
Inventor
R. Benton Nickles
Assignee (at issue)
Halliburton
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.