Granted Patent
Utility
US 6,777,638 · App. 10/294,968
Plasma arc torch and method of operation for reduced erosion of electrode and nozzle
Inventor:
Valerian Nemchinsky
Patented Case
View Patent ↗
Granted: Aug 17, 2004
Filed: Nov 14, 2002
Inventor
Valerian Nemchinsky
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.