Granted Patent
Utility
US 5,092,906 · App. 07/615,532
Anionic azo dye mixtures and their use for dyeing natural and synthetic polyamides
Inventor:
Dieter Mausezahl
Patented Case
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Granted: Mar 3, 1992
Filed: Nov 19, 1990
Inventor
Dieter Mausezahl
Assignee (at issue)
Ciba-Geigy
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.