Granted Patent
Utility
US 5,230,820 · App. 07/973,591
Storage-stable bleaching detergents containing bis-benzofuranyl fluoescent whitening agents
Inventors:
Dieter Reinehr, Claude Eckhardt, Jurgen Kaschig, Kurt Weber
Patented Case
View Patent ↗
Granted: Jul 27, 1993
Filed: Nov 9, 1992
Inventors
Dieter Reinehr
Claude Eckhardt
Jurgen Kaschig
Kurt Weber
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.