Patents by Inventor Tadasu Yagi

Tadasu Yagi 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).

  • Method for producing carbon fibers from acrylonitrile fiber strands
    Patent number: 4869856
    Abstract: A method for manufacturing carbon fiber strand from an acrylic polymer by steps of (a) wet spinning, (b) washing with water to obtain gelled fiber strand and (c) drying, wherein during the drying step the gelled fiber strand is shrunk by about 5 to 15% when the water of the gelled fiber strand is within a range of from about 100 to 20% by weight based on the weight of the dry fiber strand. An acrylic fiber strand without coalescence or entangling of filaments can consistently be obtained, from which carbon fibers with high quality and substantially no coalescence can be produced.
    Type: Grant
    Filed: August 7, 1987
    Date of Patent: September 26, 1989
    Assignee: Toho Rayon Co., Ltd.
    Inventors: Hayashi Takahashi, Tadasu Yagi