Patents by Inventor Akihiro Wada

Akihiro Wada 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).

  • Injection molded articles with improved surface characteristics, production of same and apparatus therefor
    Patent number: 4340551
    Abstract: In injection molding thermoplastic resin compositions containing reinforcing materials and/or fillers, high quality molded articles superior in surface gloss and exhibiting substantially no surface defect can be obtained, by employing a technical measure, in which only superficial layer of the inner wall surface of the mold is selectively heated, by high-frequency induction heating, to a temperature above the heat distortion temperature of the thermoplastic resin composition employed prior to injection molding and cooling and solidifying the resin.
    Type: Grant
    Filed: August 11, 1980
    Date of Patent: July 20, 1982
    Assignee: Asahi-Dow Limited
    Inventors: Akihiro Wada, Kichiya Tazaki, Tamotsu Tahara, Hiroshi Suzuki, Yukihisa Mizutani
  • Molding material structure
    Patent number: 4169186
    Abstract: A molding material structure of a thermoplastic resin composition comprising (1) at least one pillar-shaped body made of a bundle of glass fiber filaments and a non-oriented thermoplastic resin and (2) an outer covering layer of an oriented thermoplastic resin compatible with the resin in said inner body is found to produce molded articles in which glass fiber filaments are dispersed uniformly in the resin matrix with longer average length to improve various properties of molded articles, especially impact strength.
    Type: Grant
    Filed: April 13, 1978
    Date of Patent: September 25, 1979
    Assignee: Asahi-Dow Limited
    Inventors: Kichiya Tazaki, Tamotsu Tahara, Akihiro Wada, Yukihisa Mizutani