Granted Patent
Utility
US 4,889,562 · App. 07/202,857
Organic pigments coated with crosslinked ethyl cellulose
Inventors:
Philippe Bugnon, Bernhard Medinger
Patented Case
View Patent ↗
Granted: Dec 26, 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.