Granted Patent
Utility
US 5,414,237 · App. 08/136,974
Plasma arc torch with integral gas exchange
Inventor:
Donald W. Carkhuff
Patented Case
View Patent ↗
Granted: May 9, 1995
Filed: Oct 14, 1993
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.