Granted Patent
Utility
US 4,594,075 · App. 06/693,392
Process for spray-drying readily water-soluble dyes and fluorescent brighteners
Inventor:
Ernst Schenkenberger
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: Jan 22, 1985
Inventor
Ernst Schenkenberger
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.