Patents by Inventor Toshihiko Amaya

Toshihiko Amaya 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).

  • Cement dispersant and concrete composition containing the dispersant
    Patent number: 6680348
    Abstract: A cement dispersant (especially a dispersant for concretes with ultrahigh performance) comprising as a main component a water-soluble amphoteric copolymer obtained by copolymerizing (A) a polyamide-polyamine of an alkylene oxide adduct thereof with (B) (meth)acrylic acid or an alkali metal, ammonium, or alkanolamine salt thereof and (C) a polyalkylene glycol ester of (meth)acrylic acid in an A/B/C ratio of (10-40)/(10-40)/(50-80) (wt. %); and a concrete composition (especially an ultral high-performance concrete) containing the dispersant. The dispersant satisfies all of a water-reducing effect, slump flow retention, strength development, etc.
    Type: Grant
    Filed: June 20, 2001
    Date of Patent: January 20, 2004
    Assignees: Sika Ltd., Toho Chemical Industry Co., Ltd.
    Inventors: Toshihiko Amaya, Akira Ikeda, Jun Imamura, Atsushi Kobayashi, Kaname Saito, Wernher M. Danzinger, Tetsu Tomoyose