Granted Patent
Utility
US 4,468,341 · App. 06/546,149
Stable purified aqueous solutions of fluorescent whitening agent
Inventor:
Bryan R. Beyer
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Oct 27, 1983
Inventor
Bryan R. Beyer
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.