Granted Patent
Utility
US 4,538,838 · App. 06/450,943
Method and apparatus of sealing threaded sections of a well tool
Inventor:
Ronald E. Pringle
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Dec 20, 1982
Inventor
Ronald E. Pringle
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.