Granted Patent
Utility
US 4,581,445 · App. 06/533,531
Cationic benzothiazole disazo compounds
Inventor:
Visvanathan Ramanathan
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Sep 16, 1983
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.