Granted Patent
Utility
US 4,396,393 · App. 06/346,979
Dye mixtures and their use
Inventors:
Harry Schaetzer, Helmut Raisin, Dieter Mausezahl
Patented Case
View Patent ↗
Granted: Aug 2, 1983
Filed: Feb 8, 1982
Inventors
Harry Schaetzer
Helmut Raisin
Dieter Mausezahl
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.