Granted Patent
Utility
US 4,276,213 · App. 06/049,820
Process for the coloration of organic material of high molecular weight in the melt with anthraquinone dyes
Inventor:
Max Jost
Patented Case
View Patent ↗
Granted: Jun 30, 1981
Filed: Jun 18, 1979
Inventor
Max Jost
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.