Patents Assigned to Hirotaka Ihara
  • Pyrogen adsorbent containing amide groups
    Patent number: 5279821
    Abstract: Here is disclosed a water-insoluble pyrogen adsorbent composed of a polymer possessing amide groups optionally modified, said polymer being, e.g., a poly amino acid, a nylon, on a polyacrylamide.
    Type: Grant
    Filed: August 30, 1991
    Date of Patent: January 18, 1994
    Assignees: Chuichi Hirayama, Hirotaka Ihara, Ajinomoto Co., Inc.
    Inventors: Chuichi Hirayama, Hirotaka Ihara, Shunsei Tsunoda, Katsutoshi Aihara, Kazufumi Yagyu, Masao Honma
  • Method for preparing granular porous chitosan
    Patent number: 4975542
    Abstract: A method for preparing granular porous chitosan which comprises dispersing an acidic aqueous solution of chitosan in a hydrophobic dispersing medium; and, evaporating water off while stirring the resulting dispersion.
    Type: Grant
    Filed: May 19, 1989
    Date of Patent: December 4, 1990
    Assignees: Kurita Water Industries Ltd., Chuichi Hirayama, Hirotaka Ihara
    Inventors: Chuichi Hirayama, Hirotaka Ihara, Junichi Ida
  • Spherical grains of polyamino acid and production method thereof
    Patent number: 4948816
    Abstract: The present invention provides novel spherical grains of polyamino acid wh can be used as a filler in chromatography, cosmetic powder and the like. The spherical grains can be produced by a method which comprises the steps of preparing a solution of hydrophobic polyamino acid such as poly n-leucine dissolved in an organic solvent; adding the solution to an aqueous medium and agitating said medium so as to obtain a dispersion of the spherical grains of the polyamino acid dispersed in the aqueous medium while evaporating the organic solvent; and taking out the spherical grains of polyamino acid from the dispersion.
    Type: Grant
    Filed: June 20, 1989
    Date of Patent: August 14, 1990
    Assignees: Chuichi Hirayama, Yoshiaki Motozato, Hirotaka Ihara, Juridical Foundation the Chemo-Sero-Therapeutic Research Institute, Mitsui Toatus Chemical, Inc.
    Inventors: Chuichi Hirayama, Yoshiaki Motozato, Hirotaka Ihara
  • Spherical grains of polyamino acid and production method thereof
    Patent number: 4840975
    Abstract: The present invention provides novel spherical grains of polyamino acid wh can be used as a filler in chromatography, cosmetic powder and the like. The spherical grains can be produced by a method which comprises the steps of preparing a solution of hydrophobic polyamino acid such as poly n-leucine dissolved in an organic solvent; adding the solution to an aqueous medium and agitating said medium so as to obtain a dispersion of the spherical grains of the polyamino acid dispersed in the aqueous medium while evaporating the organic solvent; and taking out the spherical grains of polyamino acid from the dispersion.
    Type: Grant
    Filed: November 3, 1987
    Date of Patent: June 20, 1989
    Assignees: Chuichi Hirayama, Yoshiaki Motozato, Hirotaka Ihara, Juridical Foundation The Chemo-Sero-Therapeutic Research Institute, Mitsui Toatus Chemical, Inc.
    Inventors: Chuichi Hirayama, Yoshiaki Motozato, Hirotaka Ihara