Granted Patent
Utility
US 5,376,696 · App. 08/002,431
Foundry mixes based upon reclaimed sand
Inventors:
William R. Dunnavant, Kenneth W. Barnett, Gary R. Hysell
Patented Case
View Patent ↗
Granted: Dec 27, 1994
Filed: Jan 8, 1993
Inventors
William R. Dunnavant
Kenneth W. Barnett
Gary R. Hysell
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.