Granted Patent
Utility
US 4,862,965 · App. 07/202,350
Threadless well tool and method of making
Inventor:
Ronald E. Pringle
Patented Case
View Patent ↗
Granted: Sep 5, 1989
Filed: Jun 6, 1988
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.