Granted Patent
Utility
US 5,482,484 · App. 08/137,204
Apparatus for offshore swivel replacement
Inventor:
Sigmund Askestad
Patented Case
View Patent ↗
Granted: Jan 9, 1996
Filed: Oct 26, 1993
Inventor
Sigmund Askestad
Assignee (at issue)
NORSK HYDRO ASA
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.