Granted Patent
Utility
US 4,286,629 · App. 06/101,377
Removable plug
Inventors:
Steven G. Streich, Lloyd C. Knox
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Dec 7, 1979
Inventors
Steven G. Streich
Lloyd C. Knox
Assignee (at issue)
Halliburton
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.