Granted Patent
Utility
US 6,723,221 · App. 09/908,253
Insulation assemblies for metal production cells
Inventors:
Leroy E. D'Astolfo, Thomas R. Hornack, Raymond Miller, Robert L. Kozarek
Patented Case
View Patent ↗
Granted: Apr 20, 2004
Filed: Jul 18, 2001
Inventors
Leroy E. D'Astolfo
Thomas R. Hornack
Raymond Miller
Robert L. Kozarek
Assignee (at issue)
ALCOA 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.