Patents by Inventor Katsumi Gunji

Katsumi Gunji 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).

  • Production of biaxially drawn film of polyamide blend
    Patent number: 4098860
    Abstract: A process for preparing a biaxially stretched film of polyamide blend, which comprises (1) extruding a polyamide blend in melt to make an unstretched film and (2) stretching the unstretched film first in a machine direction with a stretch speed of about 40,000 to 60,000,000 %/minute in a draw ratio of about 2 to 6 and then in a transverse direction with a stretch speed of about 500 to 100,000 %/minute in a draw ratio of about 2 to 6, or (2') stretching the unstretched film first to make a uniaxially stretched film having a plane orientation index of about 0.6 to 1.
    Type: Grant
    Filed: August 4, 1976
    Date of Patent: July 4, 1978
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Yoshitaka Etou, Mikio Matsuoka, Shizuo Matsumoto, Takamichi Zoda, Katsumi Gunji, Toshihiko Ohta, Kazuo Tamaki, Koichi Matsunami, Tetsushi Murakami