Patents by Inventor Kazuma Okumura

Kazuma Okumura 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: 9458557
    Abstract: There is provided a dry-wet spinning device for an acrylic precursor fiber bundle for manufacturing carbon fibers, the device enabling stable spinning by making the coagulability of spun yarn (2) uniform by suppressing the vibration of the coagulating liquid surface to make the spun yarn (2) spun downward from a spinneret (1) without the liquid surface being in contact with the spinning surface of the spinneret less susceptible to an accompanying flow reflected by the bottom surface of a spinning bath. To this end, in the present invention, a horizontal flow straightening plate (8) produced from a porous plate or a plate material extending in the direction approximately perpendicular to the direction in which the spun yarn (2) is spun is disposed in a coagulation bath so as to surround the circumference of the yarn spun downward from the spinneret (1).
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: October 4, 2016
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Hiromasa Inada, Tomotaka Yoshimori, Hiroshi Hashimoto, Atsushi Kawamura, Kazuma Okumura
  • Publication number: 20140232036
    Abstract: There is provided a dry-wet spinning device for an acrylic precursor fiber bundle for manufacturing carbon fibers, the device enabling stable spinning by making the coagulability of spun yarn (2) uniform by suppressing the vibration of the coagulating liquid surface to make the spun yarn (2) spun downward from a spinneret (1) without the liquid surface being in contact with the spinning surface of the spinneret less susceptible to an accompanying flow reflected by the bottom surface of a spinning bath. To this end, in the present invention, a horizontal flow straightening plate (8) produced from a porous plate or a plate material extending in the direction approximately perpendicular to the direction in which the spun yarn (2) is spun is disposed in a coagulation bath so as to surround the circumference of the yarn spun downward from the spinneret (1).
    Type: Application
    Filed: September 24, 2012
    Publication date: August 21, 2014
    Applicant: MITSUBISHI RAYON CO., LTD.
    Inventors: Hiromasa Inada, Tomotaka Yoshimori, Hiroshi Hashimoto, Atsushi Kawamura, Kazuma Okumura