Granted Patent
Utility
US 4,447,359 · App. 06/130,795
Substituted 2-(chloro, bromo or cyano)-4,6-dinitrophenyl azo phenyl dyes
Inventor:
Peter Aeschlimann
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Mar 17, 1980
Inventor
Peter Aeschlimann
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.