Granted Patent
Utility
US 4,777,246 · App. 06/841,395
1-diazo-2-naphthol-4-sulfonic acid by iron-catalyzed diazotization
Inventor:
Bruno Fortsch
Patented Case
View Patent ↗
Granted: Oct 11, 1988
Filed: Mar 19, 1986
Inventor
Bruno Fortsch
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.