Granted Patent
Utility
US 5,074,885 · App. 07/576,639
Process for the dyeing of wool with anionic dyes and ultra-violet absorber and oxidative bleaching following by reductive bleaching
Inventor:
Gerhard Reinert
Patented Case
View Patent ↗
Granted: Dec 24, 1991
Filed: Aug 31, 1990
Inventor
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.