Granted Patent
Utility
US 4,894,447 · App. 07/036,416
Surflonated azo dyes containing a diazo component consisting of a two ring heterocycle with an aminophenylene group
Inventor:
Jean-Marie Adam
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Apr 9, 1987
Inventor
Jean-Marie Adam
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.