Granted Patent
Utility
US 4,773,470 · App. 07/123,336
Casting aluminum alloys with a mold header comprising delaminated vermiculite
Inventors:
Stephen C. Libby, G. Edward Graddy, Jr.
Patented Case
View Patent ↗
Granted: Sep 27, 1988
Filed: Nov 19, 1987
Inventors
Stephen C. Libby
G. Edward Graddy, Jr.
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.