Granted Patent
Utility
US 4,493,798 · App. 06/299,690
Metal complexes of disazo dyes
Inventor:
Fabio Beffa
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Sep 8, 1981
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.