Granted Patent
Utility
US 4,339,238 · App. 06/223,173
Stable aqueous formulations of stilbene fluorescent whitening agents
Inventors:
Werner Fringeli, Alain Lauton
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Jan 7, 1981
Inventors
Werner Fringeli
Alain Lauton
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.