Granted Patent
Utility
US 4,409,868 · App. 06/476,638
Threading tool and method
Inventors:
David R. Huddle, Robert L. Coleman
Patented Case
View Patent ↗
Granted: Oct 18, 1983
Filed: Mar 23, 1983
Inventors
David R. Huddle
Robert L. Coleman
Assignee (at issue)
The Valeron Corporation
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.