Granted Patent
Utility
US 6,005,021 · App. 09/196,976
No-bake foundry mixes and their uses
Inventors:
Chia-Hung Chen, Thomas E. Dando
Patented Case
View Patent ↗
Granted: Dec 21, 1999
Filed: Nov 20, 1998
Inventors
Chia-Hung Chen
Thomas E. Dando
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.