Granted Patent
Utility
US 4,808,230 · App. 07/202,856
Organic pigments coated with metal oxides fixed with ethyl cellulose
Inventors:
Philippe Bugnon, Bernhard Medinger
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Jun 6, 1988
Inventors
Philippe Bugnon
Bernhard Medinger
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.