Granted Patent
Utility
US 5,000,266 · App. 07/518,980
Hydraulic/torsion packoff installation tool
Inventors:
Brian Saunders, Jerry D. Smith
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: May 4, 1990
Inventors
Brian Saunders
Jerry D. Smith
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.