Granted Patent
Utility
US 4,364,845 · App. 06/055,417
Concentrated aqueous solutions of sulfo group-containing fluorescent brighteners which are stable on storage
Inventor:
Werner Fringeli
Patented Case
View Patent ↗
Granted: Dec 21, 1982
Filed: Jul 6, 1979
Inventor
Werner Fringeli
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.