Granted Patent
Utility
US 5,372,199 · App. 08/018,065
Subsea wellhead
Inventors:
Eugene J. Cegielski, Robert Lee Wilkins
Patented Case
View Patent ↗
Granted: Dec 13, 1994
Filed: Feb 16, 1993
Inventors
Eugene J. Cegielski
Robert Lee Wilkins
Assignee (at issue)
Cooper Industries Holdings
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.