Granted Patent
Utility
US 4,320,218 · App. 06/174,970
Binder composition
Inventors:
Bruce A. Gruber, Heimo J. Langer, William R. Dunnavant
Patented Case
View Patent ↗
Granted: Mar 16, 1982
Filed: Aug 4, 1980
Inventors
Bruce A. Gruber
Heimo J. Langer
William R. Dunnavant
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.