Patents by Inventor Yasuzi Tanaka

Yasuzi Tanaka 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).

  • Plastic lens material, production process of the material, composition for plastic lens, plastic lens obtained by curing the composition, and production process of the plastic lens
    Patent number: 6586508
    Abstract: A plastic lens material comprising a compound in which a part or all of 1,4-cyclohexane dicarboxylate structural units are a cis structure; a production process of the material; a plastic lens composition containing the material; a plastic lens obtained by curing the composition; and a production process of the plastic lens. A plastic lens material free of changing into a white and turbid material during storage for a long period of time is provided.
    Type: Grant
    Filed: June 4, 2001
    Date of Patent: July 1, 2003
    Assignee: Showa Denko K.K.
    Inventors: Kazuhiko Ooga, Yoshifumi Asai, Yasuzi Tanaka, Tsuneo Tajima, Hiroshi Uchida
  • Plastic lens material, production process of the material, composition for plastic lens, plastic lens obtained by curing the composition, and production process of the plastic lens
    Publication number: 20030109615
    Abstract: A plastic lens material comprising a compound in which a part or all of 1,4-cyclohexane dicarboxylate structural units are a cis structure; a production process of the material; a plastic lens composition containing the material; a plastic lens obtained by curing the composition; and a production process of the plastic lens. A plastic lens material free of changing into a white and turbid material during storage for a long period of time is provided.
    Type: Application
    Filed: June 4, 2001
    Publication date: June 12, 2003
    Inventors: Kazuhiko Ooga, Yoshifumi Asai, Yasuzi Tanaka, Tsuneo Tajima, Hiroshi Uchida
  • Resin composition comprising cyano-substituted norborene polymers blended with graft copolymers
    Patent number: 4104325
    Abstract: A resin composition is prepared from 5 to 95 parts by weight of a polymer prepared by ring-opening polymerization of cyano-substituted norbornene derivatives having at least one nitrile group or substituents including nitrile group and 95 to 5 parts by weight of graft copolymer obtained by grafting at least one elastomer with at least one vinyl compound selected from the group consisting of styrene, acrylonitrile and methyl methacrylate.
    Type: Grant
    Filed: January 10, 1977
    Date of Patent: August 1, 1978
    Assignee: Showa Denko K.K.
    Inventors: Takashi Ueshima, Yasuzi Tanaka, Toshiro Yokoyama, Shoichi Kobayashi
  • Polymers of acid anhydride type norbornene derivatives and a method of preparing the same
    Patent number: 4028482
    Abstract: Polymers or copolymers of acid anhydride type norbornene derivatives and a method of preparing the same, said polymers or copolymers being formed with a reduced viscosity of 0.1 to 20 by ring-opening polymerization of acid anhydride type norbornene derivatives having at least one carboxylic anhydride group or a mixture of said norbornene derivatives and cycloolefins.
    Type: Grant
    Filed: September 19, 1974
    Date of Patent: June 7, 1977
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Takashi Ueshima, Yasuzi Tanaka, Shoichi Kobayashi
  • Novel polymer containing cyclopentanylvinylene units
    Patent number: 4022954
    Abstract: Processes for preparing novel polymers containing carboxyl or carboxylate groups which comprises hydrolyzing starting polymers containing acid anhydride groups in the presence of acids or alkalies, the starting polymers being prepared by ring-opening polymerization of acid anhydride-type norbornene derivatives, and the characteristics and utility of these novel polymers are disclosed.
    Type: Grant
    Filed: July 1, 1975
    Date of Patent: May 10, 1977
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Shigeru Kurosawa, Takashi Ueshima, Yasuzi Tanaka, Shoichi Kobayashi
  • Cyano-substituted norbornene polymers blended with polyvinyl chloride resins
    Patent number: 4021510
    Abstract: A resin composition is prepared from 5 to 95 parts by weight of a polymer prepared by ring-opening polymerization of cyano-substituted norbornene derivatives having at least one nitrile group or substituents including nitrile group and 95 to 5 parts by weight of (a) homopolymer or copolymer of vinyl chloride, (b) styrene homopolymer or vinyl copolymer containing at least 50 per cent by weight of at least one vinyl compound selected from the group consisting of styrene, acrylonitrile and methyl methacrylate, (c) said homopolymer or copolymer compounded with elastomer, or (d) graft copolymer obtained by grafting at least one of said vinyl compounds to said elastomer.
    Type: Grant
    Filed: March 19, 1974
    Date of Patent: May 3, 1977
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Takashi Ueshima, Yasuzi Tanaka, Toshiro Yokoyama, Shoichi Kobayashi