Granted Patent
Utility
US 5,656,760 · App. 08/530,975
Fluorescent whitening agents
Inventors:
Jean-Pierre Bacher, Claude Eckhardt, Dieter Reinehr
Patented Case
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Granted: Aug 12, 1997
Filed: Sep 20, 1995
Inventors
Jean-Pierre Bacher
Claude Eckhardt
Dieter Reinehr
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.