Granted Patent
Utility
US 4,618,674 · App. 06/567,295
Red-1-(cyanophenylazo- or cyano, halophenylazo)-2-amino-8-hydroxynaphthalene-6 sulfonic acid dyestuffs
Inventor:
Kurt A. Dellian
Patented Case
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Granted: Oct 21, 1986
Filed: Dec 30, 1983
Inventor
Kurt A. Dellian
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.