Granted Patent
Utility
US 4,427,752 · App. 06/372,781
Use of isoindoline pigments for photoelectrophoretic imaging
Inventors:
Jost von der Crone, Werner Sieber
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Apr 28, 1982
Inventors
Jost von der Crone
Werner Sieber
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.