Patents by Inventor Yasuhiko Arisaka

Yasuhiko Arisaka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Red copper complexes of disazo compounds containing triazine groups
    Patent number: 4010150
    Abstract: Lightfast and waterfast azo dyes suitable for dyeing fibers and paper, particularly cellulosic materials, and having the following formula: ##STR1## wherein A is a group selected from 4-methoxy-2-sulfophenyl, 4-methoxy-3-sulfophenyl, 2- or 3-sulphonyl, tolyl, 4-nitro-2,2'-disulfostilbyl, sulfonaphthyl and 4-(4-sulfophenylazo)-2-sulfophenyl;B is selected from monoethanolamino, diethanolamino, morpholino, and N-methylamino;W is hydrogen or sulfonic acid; andZ is sulfonic acid attached at the meta or para position relative to the pendant diazo.
    Type: Grant
    Filed: December 4, 1973
    Date of Patent: March 1, 1977
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Tooru Tabei, Yasuhiko Arisaka, Yutaka Iizuka