Granted Patent
Utility
US 4,865,744 · App. 07/224,015
Process for the continuous workup of aqueous crude dye suspensions
Inventors:
Christiane Hartling, Alberto Rabassa
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Jul 25, 1988
Inventors
Christiane Hartling
Alberto Rabassa
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.