Granted Patent
Utility
US 4,540,724 · App. 06/575,208
Phenolic resin-polyisocyanate binder systems containing a phosphorus halide and use thereof
Inventors:
William R. Dunnavant, John J. Gardikes, Heimo J. Langer
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Jan 30, 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.