Granted Patent
Utility
US 6,469,274 · App. 09/869,073
Oxygen arc cutting with plasma pre-heating of ferrous materials, such as structural steel workpieces
Inventors:
Michel Delzenne, Regis Augeraud
Patented Case
View Patent ↗
Granted: Oct 22, 2002
Filed: Jun 22, 2001
Inventors
Michel Delzenne
Regis Augeraud
Assignees (at issue)
La Soudure Autogene Francaise
L'Air Liquide, Société Anonyme à Directoire et Conseil de Surveillance pour l'Étude et l'Exploitation des Procédés Georges Claude
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.