Granted Patent
Utility
US 4,602,069 · App. 06/599,106
Phenolic resin-polyisocyanate binder systems containing a phosphorus based acid
Inventors:
William R. Dunnavant, John J. Gardikes, Heimo J. Langer
Patented Case
View Patent ↗
Granted: Jul 22, 1986
Filed: Apr 11, 1984
Inventors
William R. Dunnavant
John J. Gardikes
Heimo J. Langer
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.