Granted Patent
Utility
US 4,228,339 · App. 05/974,168
Method of hardfacing tool joints
Inventors:
Stanley R. Scales, Eric C. Sullivan
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Dec 28, 1978
Inventors
Stanley R. Scales
Eric C. Sullivan
Assignee (at issue)
Hughes Tool Company LLC
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.