Granted Patent
Utility
US 5,176,717 · App. 07/732,987
Use of sulfonated polyazo dyes for dyeing leather in brilliant fast red shades
Inventors:
Rudolf Schaulin, Peter Moser, Alois Puntener
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Jul 19, 1991
Inventors
Rudolf Schaulin
Peter Moser
Alois Puntener
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.