Disazo dyes containing 1-amino-8-hydroxy-naphthalene-3,6-or 4,6-disulfonic acid biscoupling component radicals and 5-cyano-2, 4-or 4,6-dichloropyrimidyl fiber-reactive groups

Granted: Jan 28, 1997 Filed: Jun 6, 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.