Granted Patent
Utility
US 4,780,489 · App. 07/050,996
Modifiers for aqueous basic solutions of phenolic resole resins
Inventors:
William R. Dunnavant, Robert B. Fechter, Gary R. Hysell, Young D. Kim, Heimo J. Langer
Patented Case
View Patent ↗
Granted: Oct 25, 1988
Filed: May 15, 1987
Inventors
William R. Dunnavant
Robert B. Fechter
Gary R. Hysell
Young D. Kim
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.