Granted Patent
Utility
US 6,540,794 · App. 09/664,906
Azo dyes, a process for their preparation and their use in the dyeing or printing of hydrophobic fiber materials
Inventors:
Romeo Dreier, Jean-Claude Wilhelm, Alfons Arquint, Urs Lauk
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Sep 18, 2000
Inventors
Romeo Dreier
Jean-Claude Wilhelm
Alfons Arquint
Urs Lauk
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.