Patents by Inventor Yasuo Takigawa

Yasuo Takigawa 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).

  • Thermoelectric semiconductor compound and method of making the same
    Patent number: 6225548
    Abstract: A thermoelectric semiconductor compound is provided whose performance index Z is remarkably improved without sacrificing Seebeck coefficient, electrical conductivity or thermal conductivity. The thermoelectric semiconductor compound includes a first thermoelectric semiconductor which is in the form of matrix and a second thermoelectric semiconductor which is in the form of particles dispersed in the matrix. The first thermoelectric semiconductor and the second thermoelectric semiconductor have a common element. The average diameter D of the dispersed particles complies with a formula of A<D<B, where A is the mean free path of a carrier in a single crystal of the second thermoelectric semiconductor and B is the mean free path of a long wave length phonon in the single crystal of the second thermoelectric semiconductor. A method for making the a thermoelectric semiconductor compound is provided.
    Type: Grant
    Filed: November 29, 1999
    Date of Patent: May 1, 2001
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Tsutomu Sakakibara, Takanori Imoto, Yasuo Takigawa