Granted Patent
Utility
US 5,688,857 · App. 08/632,720
Polyurethane-forming cold-box binders and their uses
Inventors:
Chia-Hung Chen, James T. Schneider
Patented Case
View Patent ↗
Granted: Nov 18, 1997
Filed: Apr 10, 1996
Inventors
Chia-Hung Chen
James T. Schneider
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.