Granted Patent
Utility
US 4,384,888 · App. 06/289,836
Treating molten aluminum
Inventor:
Ho Yu
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Aug 3, 1981
Inventor
Ho Yu
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.