Benzene or naphthalene azo dyes containing SO.sub.2 X and triazinyl fiber reactive groups, use thereof to dye materials, and materials dyed therewith

Granted: Apr 22, 1997 Filed: Jun 29, 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.