Granted Patent
Utility
US 4,433,975 · App. 06/421,202
Cationic fluorescent whitening agents
Inventor:
Hans R. Meyer
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Sep 22, 1982
Inventor
Hans R. Meyer
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.