Indanthrene Blue RS was patented in 1901 by Rene Bohn as the first anthraquinone vat dye, one of the dyes with very good fastness to light and washing. It is used to dye unmordanted cotton and as a pigment in quality paints and enamels.
WIPO ASSIGNS PATENT TO BASF, BASF (CHINA) FOR "USE OF INDANTHRENE COMPOUNDS IN ORGANIC PHOTOVOLTAICS" (GERMAN, CHINESE INVENTORS)
Aug 26, 2011; GENEVA, Aug. 26 -- Publication No. WO/2011/101810 was published on Aug. 25. Title of the invention: "USE OF indanthrene...