Granted Patent
Utility
US 4,558,201 · App. 06/679,913
Plasma-arc torch with gas cooled blow-out electrode
Inventor:
Bruce O. Hatch
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Dec 10, 1984
Inventor
Bruce O. Hatch
Assignee (at issue)
Thermal Dynamics 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.