Patents by Inventor Horoshi Usami

Horoshi Usami 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).

  • Rotary recording medium having a guide track and recording and reproducing apparatus therefor
    Patent number: 4803677
    Abstract: A disc comprises a recording surface which is divided into a plurality of equiangular sectoral regions and a guide track formed on the recording surface. Each track turn of the guide track is constituted by a row of pits formed in every other equiangular sectoral regions, and the pit is only formed in one of two mutually adjacent track turns of the guide track in each equiangular sectoral region so that the pits are formed in every other track turns in a radial direction of the disc in each equiangular sectoral region.
    Type: Grant
    Filed: June 12, 1986
    Date of Patent: February 7, 1989
    Assignee: TEAC Corporation
    Inventors: Hirohisa Yamaguchi, Horoshi Usami, Tadao Nagai, Akira Mashimo