Granted Patent
Utility
US 5,114,430 · App. 07/612,754
Process for trichromatic dyeing or printing of natural and synthetic polyamide material with fibre-reactive formazan dyes and fibre-reactive azo dyes
Inventor:
Urs Lehmann
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Nov 13, 1990
Inventor
Urs Lehmann
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.