Granted Patent
Utility
US 4,873,319 · App. 07/100,853
Disazo dyes containing a pyrimidine coupling component and a cationic alkyl ammonium group
Inventor:
Willy Stingelin
Patented Case
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Granted: Oct 10, 1989
Filed: Sep 25, 1987
Inventor
Willy Stingelin
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.