Granted Patent
Utility
US 5,216,221 · App. 07/822,076
Plasma arc torch power disabling mechanism
Inventor:
Donald W. Carkhuff
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Jan 17, 1992
Inventor
Donald W. Carkhuff
Assignee (at issue)
ESAB Welding Products, 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.