Granted Patent
Utility
US 4,990,164 · App. 07/413,370
Process for the photochemical stabilization of undyed and dyed polyamide fibre material and blends thereof with copper complex of hydroxy-salicyl-oyl-hydroxylamine derivative
Inventors:
Helmut Huber-Emden, Gerhard Reinert
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Sep 27, 1989
Inventors
Helmut Huber-Emden
Gerhard Reinert
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.