Granted Patent
Utility
US 5,090,971 · App. 07/565,421
Process and apparatus for gas treatment of a product
Inventor:
Francois Barbier
Patented Case
View Patent ↗
Granted: Feb 25, 1992
Filed: Aug 10, 1990
Inventor
Francois Barbier
Assignee (at issue)
L'Air Liquide, Societe Anonyme pour l'Etude 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.