Granted Patent
Utility
US 4,924,015 · App. 07/208,526
Substituted anthraquinones and use thereof in epoxy resins
Inventors:
Frederick H. Howell, Rudolf Duthaler, Jurgen Finter, Konrad Oertle, Visvanathan Ramanathan
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: Jun 20, 1988
Inventors
Frederick H. Howell
Rudolf Duthaler
Jurgen Finter
Konrad Oertle
Visvanathan Ramanathan
Assignee (at issue)
Ciba-Geigy
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.