Granted Patent
Utility
US 4,400,319 · App. 06/305,305
Monoazo pigments containing heterocycles, and high-molecular organic materials dyed therewith
Inventors:
Stefan Hari, Arnold Wick
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Sep 24, 1981
Inventors
Stefan Hari
Arnold Wick
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.