Granted Patent
Utility
US 4,563,193 · App. 06/549,037
Asymmetric 1:2 chrome complex dyes containing an azo and an azomethine compound
Inventor:
Fabio Beffa
Patented Case
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Granted: Jan 7, 1986
Filed: Nov 7, 1983
Inventor
Fabio Beffa
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.