Patents by Inventor Yoshimi Tujiyama

Yoshimi Tujiyama 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).

  • Polypropylene conjugate fiber
    Patent number: 5451462
    Abstract: A polypropylene conjugate fiber is provided which is suitable to a broad temperature range of hot roll processing to easily produce a non-woven fabric having a high tenacity and a good feel. The fiber comprises as a first component, a crystalline polypropylene having an isotactic pentad ratio of 0.930 or less and as a second component, a crystalline polypropylene having an isotactic pentad ratio of 0.945 or more. The first component is arranged so as to occupy 80% or more of the fiber surface, and the crystallinity of the fiber determined by X-ray diffraction is 30 to 50%.
    Type: Grant
    Filed: April 7, 1994
    Date of Patent: September 19, 1995
    Assignee: Chisso Corporation
    Inventors: Masahiko Taniguchi, Yoshimi Tujiyama