Patents by Inventor Riyouichi Sekioka

Riyouichi Sekioka 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).

  • Disperse dye mixture and dyeing method employing it: orange and yellow azo disperse dye mixture for polyester fibers
    Patent number: 5201922
    Abstract: A disperse dye mixture comprising from 20 to 80% by weight of an orange disperse dye of the following formula (A) and from 20 to 80% by weight of an orange disperse dye of the following formula (B), as dye components: ##STR1##
    Type: Grant
    Filed: December 12, 1991
    Date of Patent: April 13, 1993
    Assignee: Hoechst Mitsubishi Kasei Co., Ltd.
    Inventors: Kouichi Seto, Riyouichi Sekioka
  • Disperse dye mixture: Two red disperse dyes for polyester fibers-azo dyes containing naphthalic imide coupler
    Patent number: 5114431
    Abstract: A disperse dye mixture comprising a red disperse dye of the following formula (A): ##STR1## and at least one red disperse dye of the following formula (B): ##STR2## wherein R.sup.1 is C.sub.2 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy C.sub.2 -C.sub.3 alkyl or C.sub.1 -C.sub.4 alkoxyethoxyethyl, in a weight ratio of (B)/(A) of from 0.1 to 5.
    Type: Grant
    Filed: February 12, 1991
    Date of Patent: May 19, 1992
    Assignee: Hoechst Mitsubishi Kasei Co., Ltd.
    Inventors: Riyouichi Sekioka, Kouichi Seto
  • Water-soluble blue dye mixture and dyeing method: anthraquinone reactive dye and formazan reactive dye
    Patent number: 4888028
    Abstract: A water-soluble dye mixture comprising a blue anthraquinone reactive dye represented in its free acid form by the formula: ##STR1## wherein X is --CH.dbd.CH.sub.2 or --C.sub.2 H.sub.4 W wherein W is a group removable by action of alkali and from 0.2 to 5 times by weight to said anthraquinone reactive dye of a blue formazan reactive dye represented in its free acid form by the formula: ##STR2## wherein R is a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, Y is a halogen atom, --NHC.sub.2 H.sub.4 SO.sub.3 H or ##STR3## and X is --CH.dbd.CH.sub.2 or --C.sub.2 H.sub.4 W wherein W is a group removable by action of alkali.
    Type: Grant
    Filed: June 15, 1988
    Date of Patent: December 19, 1989
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Toshio Hihara, Riyouichi Sekioka
  • Mixtures of water-soluble red and yellow or blue reactive dyes and a method of dyeing cellulosic fibers using such dye mixtures
    Patent number: 4872881
    Abstract: A dye mixture and a method of dyeing cellulosic fibers by use of the dye mixture, the dye mixture being capable of dyeing the cellulosic fibers favorably even in the presence of a small amount of an inorganic salt at dyeing, and being composed of a blend of a red water-soluble reactive dye to be represented by the following general formula (I) in the form of free acid, and a specific yellow and/or blue water-soluble reactive dye: ##STR1## (where: each of R.sup.1 and R.sup.2 denotes a hydrogen atom or a lower alkyl group which may contain therein a substituent; R.sup.3 represents a hydrogen atom, a lower alkyl group or a halogen atom and X designates --CH.dbd.CH.sub.2 or --C.sub.2 H.sub.4 OSO.sub.3 H).
    Type: Grant
    Filed: October 31, 1988
    Date of Patent: October 10, 1989
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Takashi Fujita, Toshio Hihara, Yoshio Kogure, Riyouichi Sekioka, Noboru Nakamura