Granted Patent
Utility
US 4,448,907 · App. 06/460,426
Process for casting lightweight metals
Inventor:
Robert J. Schafer
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Jan 24, 1983
Inventor
Robert J. Schafer
Assignee (at issue)
Ashland Oil, 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.