Granted Patent
Utility
US 6,017,978 · App. 09/032,690
Polyurethane forming no-bake foundry binders
Inventors:
Chia-Hung Chen, Ken K. Chang, Albert L. Haugse, Thomas E. Dando
Patented Case
View Patent ↗
Granted: Jan 25, 2000
Filed: Feb 28, 1998
Inventors
Chia-Hung Chen
Ken K. Chang
Albert L. Haugse
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.