Granted Patent
Utility
US 5,424,404 · App. 08/075,019
Biscationic azo dyes and intermediates therefor
Inventors:
Manfred Ruske, Udo Mayer
Patented Case
View Patent ↗
Granted: Jun 13, 1995
Filed: Jun 11, 1993
Inventors
Manfred Ruske
Udo Mayer
Assignee (at issue)
BASF SE
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.