Granted Patent
Utility
US 4,346,016 · App. 06/254,822
6-Styrylquinoxalines, and their use as fluorescent brighteners
Inventors:
Kurt Burdeska, Guglielmo Kabas
Patented Case
View Patent ↗
Granted: Aug 24, 1982
Filed: Apr 16, 1981
Inventors
Kurt Burdeska
Guglielmo Kabas
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.