Patents by Inventor Hideo Koyata

Hideo Koyata 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 admixture product having improved rheological properties and process of forming same
    Patent number: 5643978
    Abstract: The present invention is directed to an imidized polycarboxylic acid polymer useful as a cement admixture, to improved cement compositions containing said polymer and to a process of forming the same.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 1, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: David Charles Darwin, Ellis Martin Gartner, Byong-Wa Chun, Hideo Koyata, Lawrence Lu Kuo
  • Cement admixture product having improved rheological properties and process of forming same
    Patent number: 5633298
    Abstract: The present invention is directed to an imidized polycarboxylic acid polymer useful as a cement admixture, to improved cement compositions containing said polymer and to a process of forming the same.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: May 27, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Ahmad Arfaei, David C. Darwin, Ellis M. Gartner, Byong-Wa Chun, Hideo Koyata, Lawrence L. Kuo
  • Cement and cement composition having improved rheological properties
    Patent number: 5583183
    Abstract: An improved hydraulic cement and resultant hydraulic cement composition having an imidized acrylic polymer uniformly distributed therein.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: December 10, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: David C. Darwin, Ellis M. Gartner, Byong-Wa Chun, Hideo Koyata, Lawrence L. Kuo
  • Dispersant composition for cement having excellent property in inhibition of slump-loss
    Patent number: 5432212
    Abstract: A cement admixture which when added to a cement composition, such as cement mortar or concrete inhibits slump-loss of the cement composition and improve its workability and applicability. The admixture is composed of copolymers from an alkenyl ether, a polyalkenyl ether and maleic anhydride.
    Type: Grant
    Filed: April 4, 1994
    Date of Patent: July 11, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Susumu Honda, Tadashi Hara, Hideo Koyata
  • Cement and cement composition having improved rheological properties
    Patent number: 5393343
    Abstract: An improved hydraulic cement and resultant hydraulic cement composition having an imidized acrylic polymer uniformly distributed therein.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: February 28, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: David C. Darwin, Ellis M. Gartner, Byong-Wa Chun, Hideo Koyata, Lawrence L. Kuo
  • Cement admixture composition
    Patent number: 5362323
    Abstract: Cement admixture compositions formed from alkenyl ether/maleic anhydride copolymers having specific molecular structures have been found to impart a high degree of slump loss over a sustained period of time while not causing any significant set retardation of the treated cement based composition.
    Type: Grant
    Filed: February 9, 1993
    Date of Patent: November 8, 1994
    Assignees: W. R. Grace & Co. Conn., NOF Corporation
    Inventors: Hideo Koyata, Susumu Honda
  • Additive composition for cement admixture
    Patent number: 5223036
    Abstract: A cement admixture is disclosed which is capable of inhibiting slump loss without set retardation to hydraulic cement compositions. The admixture is composed of a mixture comprising a copolymer of maleic anhydride and an oxyalkylene containing monomer, lignosulfonic acid or its salts and an anionic surfactant.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: June 29, 1993
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Hideo Koyata, Tomoyuki Tsutsumi