Granted Patent
Utility
US 5,074,887 · App. 07/602,027
Aqueous dye preparations: water-insoluble dye, anionic dispersant, lactate, glycerol or propylene glycol, polymer and betaine
Inventor:
Zdenek Koci
Patented Case
View Patent ↗
Granted: Dec 24, 1991
Filed: Oct 23, 1990
Inventor
Zdenek Koci
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.