Granted Patent
Utility
US 4,925,595 · App. 07/212,391
Liquid detergent compositions containing disulfonated fluorescent whitening agents: di-styryl-biphenyl or di-styryl-benzene derivatives
Inventors:
Heinz Hefti, Dieter Reinehr, Kurt Weber, Claude Eckhardt
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Jun 27, 1988
Inventors
Heinz Hefti
Dieter Reinehr
Kurt Weber
Claude Eckhardt
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.