Patents by Inventor Toshikazu Kawakita

Toshikazu Kawakita 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).

  • Biaxilly oriented polyamide film and its production process
    Patent number: 5612105
    Abstract: A biaxially oriented polyamide film which has not only excellent bending pinhole resistance and excellent dimensional stability but also excellent tear linearity in the longitudinal direction of the film. More specifically, the invention provides a biaxially oriented polyamide film having a tear linearity in the longitudinal direction of the film, which includes as a main material nylon 6 and an aliphatic polyamide resin mixed in a weight ratio of from 75:25 to 99:1, wherein the difference in surface tension (dyne/cm) between the nylon 6 and the polyamide other than nylon 6 satisfies the following relationship (1)3.0.ltoreq..gamma..sub.A -.gamma..sub.B .ltoreq.15.0 (1)wherein .gamma..sub.A is a surface tension of N6 and .gamma..sub.B is a surface tension of PA.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: March 18, 1997
    Assignee: Unitika Ltd.
    Inventors: Takashi Okamoto, Minoru Kishida, Masanobu Hioki, Atsuhiro Ishikawa, Toshikazu Kawakita