Granted Patent
Utility
US 4,883,866 · App. 07/161,288
Methine-azo compounds containing cyclic cationic ammonium groups
Inventor:
Peter Mockli
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Feb 29, 1988
Inventor
Peter Mockli
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.