Granted Patent
Utility
US 4,285,885 · App. 06/110,274
Novel distyrylbenzene containing sulfonic acid groups
Inventor:
Kurt Weber
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Jan 7, 1980
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.