Granted Patent
Utility
US 5,474,606 · App. 08/217,919
Heat curable foundry binder systems
Inventors:
Helena Twardowska, Heimo J. Langer
Patented Case
View Patent ↗
Granted: Dec 12, 1995
Filed: Mar 25, 1994
Inventors
Helena Twardowska
Heimo J. Langer
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.