Granted Patent
Utility
US 4,913,469 · App. 07/229,321
Wellhead slip and seal assembly
Inventor:
Benton Frederick Baugh
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: Aug 8, 1988
Inventor
Benton Frederick Baugh
Assignee (at issue)
Cameron Iron Works USA, 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.