Granted Patent
Utility
US 4,880,472 · App. 07/202,865
Organic pigments coated with metal oxides
Inventors:
Philippe Bugnon, Arnold Grubenmann, Bernhard Medinger, Jean Schaefle
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Jun 6, 1988
Inventors
Philippe Bugnon
Arnold Grubenmann
Bernhard Medinger
Jean Schaefle
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.