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Expired
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Christopher Ris
Ernst Haager
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Individual
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Publication of GB190727609ApublicationCriticalpatent/GB190727609A/en
27,609. Ris, C., and Haager, E. Dec. 14. Samples furnished under Section 2 of Patents &c. Act, 1907. Dyes, artificial.-Disazo dyes are obtained by combining tetrazotized benzidine, tolidine, dianisidine, diaminoetboxydiphenyl, &c., first with 2: 8-naphthol sulphonic acid, and then with 1: 8: 4- aminonaphthol sulphonic acid. The products dye wool and cotton bluish-violet to blue shades. Specification No. 16,569, A.D. 1892, is referred to.
GB190727609D1907-12-141907-12-14Improvements in and relating to the Manufacture of Blue Disazo-colouring-matters Dyeing Cotton and Wool.
ExpiredGB190727609A
(en)