Granted Patent
Utility
US 4,370,463 · App. 06/248,165
Process for no-bake foundry application utilizing polyurethanes based on amine polyols
Inventor:
Robert J. Schafer
Patented Case
View Patent ↗
Granted: Jan 25, 1983
Filed: Mar 30, 1981
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.