Granted Patent
Utility
US 4,982,781 · App. 07/308,346
No-bake process for preparing foundry shapes for casting low melting metal castings
Inventors:
William G. Carpenter, William R. Dunnavant
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Feb 9, 1989
Inventors
William G. Carpenter
William R. Dunnavant
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.