Granted Patent
Utility
US 5,234,467 · App. 07/914,156
Azo dye mixtures and their use for dyeing natural and synthetic polyamide fibers
Inventor:
Jurgen Schaetzer
Patented Case
View Patent ↗
Granted: Aug 10, 1993
Filed: Jul 14, 1992
Inventor
Jurgen Schaetzer
Assignee (at issue)
Ciba-Geigy
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.