Granted Patent
Utility
US 4,695,289 · App. 06/794,935
Process for improving the colour yield and wetfastness properties of dyeings or prints produced on cellulosic fabrics with anionic dyes: treatment with cationic imidazole
Inventor:
Rosemarie Topfl
Patented Case
View Patent ↗
Granted: Sep 22, 1987
Filed: Nov 4, 1985
Inventor
Rosemarie Topfl
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.