Patents by Inventor Yoshihisa Watamura

Yoshihisa Watamura 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).

  • Magnetic recording disk cartridge
    Patent number: 4958249
    Abstract: A magnetic recording disk cartridge includes a casing having upper and lower halves mated together to define a planar spacing in which a magnetic recording disk supported by a hub member is rotatably held, and fluctuation suppressing ring members are disposed within the casing to be axially spaced from one another via at least an outer peripheral portion of the magnetic recording disk. The fluctuation suppressing ring members aerodynamically maintain the magnetic recording disk at an intermediate position in the planar spacing of the casing during the rotation of the magnetic recording disk.
    Type: Grant
    Filed: July 18, 1988
    Date of Patent: September 18, 1990
    Assignee: Teijin Limited
    Inventors: Sadao Kadokura, Kazuhiro Kamei, Yoshihisa Watamura