Granted Patent
Utility
US 5,285,852 · App. 07/909,716
Wellhead isolation tool and method of use thereof
Inventor:
Roderick D. McLeod
Patented Case
View Patent ↗
Granted: Feb 15, 1994
Filed: Jul 27, 1992
Inventor
Roderick D. McLeod
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.