Patents by Inventor Seikichi Takahashi

Seikichi Takahashi 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).

  • Ink jet recording paper with amorphous silica filler
    Patent number: 5013603
    Abstract: Disclosed is a filler for ink jet recording paper, said filler being composed of amorphous silica having a median diameter, measured by the coulter counter method, of 2 to 15 .mu.m, an oil absorption of at least 180 ml/100 g, a refractive index, measured by the solvent method, of at least 1.450, and a moisture absorption, measured when it is caused to absorb moisture for 200 hours at a relative humidity of 90% and a temperature of 25.degree. C., of at least 35%.
    Type: Grant
    Filed: January 22, 1990
    Date of Patent: May 7, 1991
    Assignee: Mizusawa Industrial Chemicals, Ltd.
    Inventors: Masahide Ogawa, Teiji Sato, Masao Takahashi, Toshio Kitsu, Seikichi Takahashi, Kinichi Ono
  • Filler for ink jet recording paper
    Patent number: 4915923
    Abstract: Disclosed is a filler for ink jet recording paper, said filler being composed of amorphous silica having a median diameter, measured by the coulter counter method, of 2 to 15 .mu.m, an oil absorption of at least 180 ml/100 g, a refractive index, measured by the solvent method, of at least 1.450, and a moisture absorption, measured when it is caused to absorb moisture for 200 hours at a relative humidity of 90% and a temperature of 25.degree. C., of at least 35%.
    Type: Grant
    Filed: June 9, 1988
    Date of Patent: April 10, 1990
    Assignee: Mizusawa Industrial Chemicals, Ltd.
    Inventors: Masahide Ogawa, Teiji Sato, Maso Takahashi, Toshio Kitsu, Seikichi Takahashi, Kinichi Ono
  • Heat-sensitive recording paper and filler therefor
    Patent number: 4544604
    Abstract: Disclosed is a filler for a heat-sensitive recording paper comprising finely divided amorphous silica having a BET specific surface area of 10 to 100 m.sup.2 /g and a bulk density of 0.14 to 0.30 g/cc, said finely divided amorphous silica having such a secondary particle size distribution that secondary particles having a size smaller than 4 microns, as measured by the centrifugal precipitation method, occupy at least 90% by weight of the total particles.This filler is excellent in the effects of preventing the background coloration, improving the lubricating property, preventing the adhesion of scum and improving the image density.
    Type: Grant
    Filed: January 3, 1985
    Date of Patent: October 1, 1985
    Assignee: Mizusawa Industrial Chemicals, Ltd.
    Inventors: Koichi Usui, Masahide Ogawa, Kunio Goto, Teiji Sato, Masanori Tanaka, Seikichi Takahashi, Kinichi Ono, Seiji Kojima
  • Heat-sensitive recording paper and filler therefor
    Patent number: 4509064
    Abstract: Disclosed is a filler for a heat-sensitive recording paper comprising finely divided amorphous silica having a BET specific surface area of 10 to 100 m.sup.2 /g and a bulk density of 0.14 to 0.30 g/cc, said finely divided amorphous silica having such a secondary particle size distribution that secondary particles having a size smaller than 4 microns, as measured by the centrifugal precipitation method, occupy at least 90% by weight of the total particles.This filler is excellent in the effects of preventing the background coloration, improving the lubricating property, preventing the adhesion of scum and improving the image density.
    Type: Grant
    Filed: January 27, 1984
    Date of Patent: April 2, 1985
    Assignee: Mizusawa Industrial Chemicals, Ltd.
    Inventors: Koichi Usui, Masahide Ogawa, Kunio Goto, Teiji Sato, Masanori Tanaka, Seikichi Takahashi, Kinichi Ono, Seiji Kojima