Granted Patent
Utility
US 4,246,167 · App. 06/042,464
Foundry binder composition
Inventors:
Robert A. Grimm, Heimo J. Langer, John Plummer
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: May 25, 1979
Inventors
Robert A. Grimm
Heimo J. Langer
John Plummer
Assignee (at issue)
Ashland Oil, 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.