Patents by Inventor Toyohiko Yamaguchi

Toyohiko Yamaguchi 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).

  • Sulfur-containing polyester and process for its production
    Patent number: 4504651
    Abstract: A sulfur-containing polymer having a repeating unit represented by the formula: ##STR1## where R is a straight or branched alkylene group having from 1 to 6 carbon atoms, R' is a straight or branched alkylene group having from 1 to 3 carbon atoms and p is an integer of from 0 to 10, and having an average molecular weight of from 500 to 10,000 and a sulfur content of from 15 to 65% by weight. The sulfur-containing polymer of the present invention is useful as a flame or smoke retarding agent in resin and rubber materials.
    Type: Grant
    Filed: November 22, 1983
    Date of Patent: March 12, 1985
    Assignees: Hodogaya Chemical Co., Ltd., Katsura Sangyo Co., Ltd.
    Inventors: Toyohiko Yamaguchi, Koichi Kashima, Minoru Ozutsumi, Masaru Morinaga
  • Process for preparing resorcinol copolymers
    Patent number: 4376854
    Abstract: A process for preparing a resorcinol copolymer, comprising at least one specific phenol with formaldehyde at a certain mole ratio to obtain a resol-type precondensate containing 1 to 30% of residual unreacted formaldehyde and then adding said resol-type precondensate to a mixture of an acid catalyst and at least one resorcinol to effect co-condensation. The obtained copolymer is useful for an adhesive for polyester fiber and rubber.
    Type: Grant
    Filed: April 5, 1982
    Date of Patent: March 15, 1983
    Assignee: Hodogaya Chemical Co., Ltd.
    Inventors: Toyohiko Yamaguchi, Koichi Kashima, Nobuo Kaifu