Granted Patent
Utility
US 4,847,359 · App. 07/063,881
Diamino-9,10-dihydroanthracenes and polyamide acid (esters) and polyimides derived therefrom
Inventors:
Josef Pfeifer, Rudolf Duthaler
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Jun 19, 1987
Inventors
Josef Pfeifer
Rudolf Duthaler
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.