Granted Patent
Utility
US 4,869,321 · App. 07/308,485
Method of plugging openings in well conduits
Inventor:
Billy E. Hamilton
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Feb 10, 1989
Inventor
Billy E. Hamilton
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.