Granted Patent
Utility
US 4,473,500 · App. 06/374,120
Monoazo pigments derived from aminophthalimides and substituted acetoacetarylides or 2-hydroxy-3-naphthoylarylides
Inventors:
Georg Cseh, Stefan Hari
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: May 3, 1982
Inventors
Georg Cseh
Stefan Hari
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.