Granted Patent
Utility
US 4,311,641 · App. 06/074,206
Chromium complexes of mixed azo compounds
Inventor:
Fabio Beffa
Patented Case
View Patent ↗
Granted: Jan 19, 1982
Filed: Sep 10, 1979
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.