Azo dyes from sulfonated 3-sulfonated 3-amino-2,1-benzisothiazoles with 1,2,3,4-tetrahydroquinoline or 2,3-dihydro-1,4-benzoxazine couplers

Granted: Jul 23, 1985 Filed: Mar 15, 1983

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.