Granted Patent
Utility
US 5,372,202 · App. 08/160,477
Wellhead isolation tool and method of use
Inventor:
Murray Dallas
Patented Case
View Patent ↗
Granted: Dec 13, 1994
Filed: Dec 1, 1993
Inventor
Murray Dallas
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.