Granted Patent
Utility
US 4,960,434 · App. 07/363,331
Azo disperse dye mixture giving bright blue shades on polyester textiles
Inventors:
David Brierley, Alan T. Leaver
Patented Case
View Patent ↗
Granted: Oct 2, 1990
Filed: Jun 7, 1989
Inventors
David Brierley
Alan T. Leaver
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.