Granted Patent
Utility
US 4,650,859 · App. 06/688,087
Chrome azo and/or azomethine dyes containing a benzthiazolylphenyl or stilbenyl radical
Inventor:
Fabio Beffa
Patented Case
View Patent ↗
Granted: Mar 17, 1987
Filed: Dec 31, 1984
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.