Granted Patent
Utility
US 5,681,489 · App. 08/571,709
Plasma arc torch including means for disabling power source
Inventor:
Donald W. Carkhuff
Patented Case
View Patent ↗
Granted: Oct 28, 1997
Filed: Dec 13, 1995
Inventor
Donald W. Carkhuff
Assignee (at issue)
THE ESAB GROUP INC.
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.