Granted Patent
Utility
US 4,569,404 · App. 06/592,051
Mudline casing hanger
Inventors:
Lionel J. Milberger, Donald Baron, Paul C. Berner, Jr.
Patented Case
View Patent ↗
Granted: Feb 11, 1986
Filed: Mar 22, 1984
Inventors
Lionel J. Milberger
Donald Baron
Paul C. Berner, Jr.
Assignee (at issue)
Vetco Offshore, 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.