Granted Patent
Utility
US 4,588,030 · App. 06/655,481
Well tool having a metal seal and bi-directional lock
Inventor:
William A. Blizzard, Jr.
Patented Case
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Granted: May 13, 1986
Filed: Sep 27, 1984
Inventor
William A. Blizzard, Jr.
Assignee (at issue)
Camco Inc.
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.