Granted Patent
Utility
US 5,090,964 · App. 07/615,536
Red dye mixtures and their use: dyeing natural or synthetic polyamides
Inventor:
Dieter Mausezahl
Patented Case
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Granted: Feb 25, 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.