Granted Patent
Utility
US 4,562,247 · App. 06/614,909
Disazo compounds containing a 6-acetoacetamide-1-naphthol-3-sulfonic derivative as coupling component
Inventor:
Visvanathan Ramanathan
Patented Case
View Patent ↗
Granted: Dec 31, 1985
Filed: May 29, 1984
Inventor
Visvanathan Ramanathan
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.