Reactive dye mixtures, processes for their preparation and their use: reactive sulfonated tri-phenol-dioxazine dye mixture for cellulose fibers

Granted: May 4, 1993 Filed: Nov 5, 1991

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.