Granted Patent
Utility
US 4,424,170 · App. 06/375,607
Halostilbene sulfonates useful as starting materials for making fluorescent whitening agents of the 4,4'-distyrylbiphenyl series
Inventor:
Kurt Weber
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: May 6, 1982
Inventor
Kurt Weber
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.