Granted Patent
Utility
US 4,523,924 · App. 06/560,654
Process for the preparation of stable aqueous solutions of water-soluble reactive dyes by membrane separation
Inventor:
Roger Lacroix
Patented Case
View Patent ↗
Granted: Jun 18, 1985
Filed: Dec 12, 1983
Inventor
Roger Lacroix
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.