Granted Patent
Utility
US 5,380,870 · App. 08/166,750
Mixed crystals of sulfonated diketopyrrolopyrroles
Inventors:
Stefan Hari, Olof Wallquist, Fritz Herren, Thomas Eichenberger
Patented Case
View Patent ↗
Granted: Jan 10, 1995
Filed: Dec 14, 1993
Inventors
Stefan Hari
Olof Wallquist
Fritz Herren
Thomas Eichenberger
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.