Cationic or basic azo dyes consisting of an amino benzothiazole diazo component and a disubstituted aniline component, which dyes contain at least one aromatic radical

Granted: Jun 3, 1997 Filed: Apr 21, 1995

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.