Granted Patent
Utility
US 4,770,818 · App. 07/110,162
Process for the preparation of 1-aminoanthraquinones
Inventors:
Eric Plattner, Gottfried Seifert, Tibor Somlo
Patented Case
View Patent ↗
Granted: Sep 13, 1988
Filed: Oct 19, 1987
Inventors
Eric Plattner
Gottfried Seifert
Tibor Somlo
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.