Granted Patent
Utility
US 5,038,865 · App. 07/458,951
Method of and apparatus for protecting downhole equipment
Inventors:
William M. Taylor, Joseph H. Hynes, David H. Theiss
Patented Case
View Patent ↗
Granted: Aug 13, 1991
Filed: Dec 29, 1989
Inventors
William M. Taylor
Joseph H. Hynes
David H. Theiss
Assignee (at issue)
Cooper Industries Holdings
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.