Granted Patent
Utility
US 5,942,604 · App. 09/027,479
Azo dye mixtures
Inventors:
Paul Herzig, Antoine Clement, Romeo Dreier, Alfons Arquint
Patented Case
View Patent ↗
Granted: Aug 24, 1999
Filed: Feb 20, 1998
Inventors
Paul Herzig
Antoine Clement
Romeo Dreier
Alfons Arquint
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.