Granted Patent
Utility
US 6,555,664 · App. 09/869,503
Phthalimidyl azo pigments, method for producing same and utilisation thereof
Inventors:
Urs Lauk, Antoine Clement, Romeo Dreier, Alfons Arquint
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Jun 28, 2001
Inventors
Urs Lauk
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.