Granted Patent
Utility
US 4,950,304 · App. 07/248,076
Process for quenching or suppressing the fluorescence of substrates treated with fluorescent whitening agents
Inventors:
Gerhard Reinert, Kurt Burdeska
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Sep 23, 1988
Inventors
Gerhard Reinert
Kurt Burdeska
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.