Granted Patent
Utility
US 6,491,863 · App. 09/735,178
Method and apparatus for efficient utilization of a cryogen for inert cover in metals melting furnaces
Inventor:
Stewart C. Jepson
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Dec 12, 2000
Inventor
Stewart C. Jepson
Assignees (at issue)
L'Air Liquide, Société Anonyme à Directoire et Conseil de Surveillance pour l'Étude et l'Exploitation des Procédés Georges Claude
Air Liquide America Corporation
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.