Granted Patent
Utility
US 5,644,040 · App. 08/560,265
Azo dyes having two monoazo-chromophores bound to a halotriazinyl radical processes for their preparation and their use
Inventor:
Rudolf Hurter
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Nov 21, 1995
Inventor
Rudolf Hurter
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.