Granted Patent
Utility
US 5,332,044 · App. 07/958,502
Wellhead isolation tool and method of use
Inventors:
L. Murray Dallas, Boyd B. English
Patented Case
View Patent ↗
Granted: Jul 26, 1994
Filed: Oct 8, 1992
Inventors
L. Murray Dallas
Boyd B. English
Assignee (at issue)
L. 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.