Granted Patent
Utility
US 4,940,555 · App. 07/323,707
Storage-stable anionic liquid detergent compositions containing amphoteric distyryl derivative fluorescent whiteners
Inventors:
Claude Eckhardt, Heinz Hefti
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Mar 15, 1989
Inventors
Claude Eckhardt
Heinz Hefti
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.