Granted Patent
Utility
US 5,457,142 · App. 08/047,439
Hot-box foundry mix
Inventors:
Thomas E. Dando, Gary W. Strehl
Patented Case
View Patent ↗
Granted: Oct 10, 1995
Filed: Apr 13, 1993
Inventors
Thomas E. Dando
Gary W. Strehl
Assignee (at issue)
Ashland, 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.