Granted Patent
Utility
US 6,772,820 · App. 10/603,673
Polyurethane based binder system for the manufacture of foundry cores and molds
Inventors:
Jean-Claude Roze, Gunther Weicker, Diether Koch, Andreas Werner
Patented Case
View Patent ↗
Granted: Aug 10, 2004
Filed: Jun 26, 2003
Inventors
Jean-Claude Roze
Gunther Weicker
Diether Koch
Andreas Werner
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.