Granted Patent
Utility
US 4,541,831 · App. 06/221,166
Dustless, water-soluble, solid, dyestuff or optical brightener compositions and a process of production
Inventors:
Walter Gunther, Kurt Hintermayr
Patented Case
View Patent ↗
Granted: Sep 17, 1985
Filed: Dec 29, 1980
Inventors
Walter Gunther
Kurt Hintermayr
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.