Granted Patent
Utility
US 4,479,913 · App. 06/467,984
Method and composition for a ramming mix in aluminum reduction cells
Inventors:
Denis W. Akerberg, Carl A. Rude
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: Feb 18, 1983
Inventors
Denis W. Akerberg
Carl A. Rude
Assignee (at issue)
QO Chemicals, 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.