Granted Patent
Utility
US 5,874,487 · App. 08/743,765
Foundary binder systems which contain alcohol modified polyisocyanates
Inventors:
Rina Singh, Laurence G. Dammann
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: Nov 7, 1996
Inventors
Rina Singh
Laurence G. Dammann
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.