Granted Patent
Utility
US 4,754,021 · App. 06/767,912
Methine-azo compounds containing cyclic ammonium groups
Inventor:
Peter Mockli
Patented Case
View Patent ↗
Granted: Jun 28, 1988
Filed: Aug 21, 1985
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.