Granted Patent
Utility
US 4,769,158 · App. 06/939,146
Molten metal filtration system using continuous media filter
Inventor:
Charles E. Eckert
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: Dec 8, 1986
Inventor
Charles E. Eckert
Assignee (at issue)
Aluminum Company of America
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.