Patents by Inventor Katsuhiro Kutsuna

Katsuhiro Kutsuna 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).

  • Patent number: 5760160
    Abstract: An aromatic polycarbonate resin granule formed of an aggregate of fine powder particles, the granule having a specific surface area of 0.05 to 2.0 m.sup.2 /g, a bulk density of 0.3 to 0.8 g/ml, and an average particle diameter of 0.2 to 5 mm. At least 90% of the fine powder particles forming the granule have a particle diameter of 50 .mu.m or less, and the content of a halogenated hydrocarbon as an organic solvent in the granule is 50 ppm or less in terms of a halogen amount. The polycarbonate granule is obtained by preparing a slurry or wet paste containing a polycarbonate, in which the amount of an organic solvent based on the total amount of the polycarbonate and the organic solvent is 10 to 65% by weight, and the amount of water based on the polycarbonate is at least 5% by weight. The above slurry or wet paste is subjected to a pulverization step to form the fine powder particles in which at least 90% have a particle diameter of 50 .mu.m or less.
    Type: Grant
    Filed: March 7, 1997
    Date of Patent: June 2, 1998
    Assignee: Teijin Chemicals Ltd.
    Inventors: Hideki Isshiki, Akiyoshi Manabe, Katsuhiro Kutsuna
  • Patent number: 5663277
    Abstract: An aromatic polycarbonate resin granule formed of an aggregate of fine powder particles, the granule having a specific surface area of 0.05 to 2.0 m.sup.2 /g, a bulk density of 0.3 to 0.8 g/ml, and an average particle diameter of 0.2 to 5 mm. At least 90% of the fine powder particles forming the granule have a particle diameter of 50 .mu.m or less, and the content of a halogenated hydrocarbon as an organic solvent in the granule is 50 ppm or less in terms of a halogen amount. The polycarbonate granule is obtained by preparing a slurry or wet paste containing a polycarbonate, in which the amount of an organic solvent based on the total amount of the polycarbonate and the organic solvent is 10 to 65% by weight, and the amount of water based on the polycarbonate is at least 5% by weight. The above slurry or wet paste is subjected to a pulverization step to form the fine powder particles in which at least 90% have a particle diameter of 50 .mu.m or less.
    Type: Grant
    Filed: June 23, 1995
    Date of Patent: September 2, 1997
    Assignee: Teijin Chemicals, Ltd.
    Inventors: Hideki Isshiki, Akiyoshi Manabe, Toshinori Kitachi, Yoshifumi Ikemura, Katsuhiro Kutsuna, Tatsumi Horie