Granted Patent
Utility
US 6,008,332 · App. 08/682,201
Phthalimidylazo dyes, process for their preparation and the use thereof
Inventors:
Paul Herzig, Romeo Dreier
Patented Case
View Patent ↗
Granted: Dec 28, 1999
Filed: Jul 17, 1996
Inventors
Paul Herzig
Romeo Dreier
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.