Granted Patent
Utility
US 4,456,663 · App. 06/439,157
Hot-dip aluminum-zinc coating method and product
Inventor:
Ralph W. Leonard
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: Nov 4, 1982
Inventor
Ralph W. Leonard
Assignee (at issue)
United States Steel Corporation
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.