Granted Patent
Utility
US 4,218,605 · App. 06/025,319
Air-carbon arc cutting and gouging torch
Inventors:
Stephen A. Hoffman, Jerry R. Hummel
Patented Case
View Patent ↗
Granted: Aug 19, 1980
Filed: Mar 30, 1979
Inventors
Stephen A. Hoffman
Jerry R. Hummel
Assignee (at issue)
Arcair Company
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.