Patents by Inventor Shigeki Kawase

Shigeki Kawase 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 medium
    Patent number: 4645703
    Abstract: A magnetic recording medium comprises steep mountain-shaped protrusions having heights ranging 50-600 .ANG. and distributed at a rate of 1.times.50.sup.5 -1.times.10.sup.8 protrusions/mm.sup.2 on a surface of ferromagnetic metal layer and further thereon a lubricant layer; the magnetic recording medium is suitable for VTR tape which has a satisfactory durability for repeated use and eliminates head clogging and squealing.
    Type: Grant
    Filed: October 10, 1985
    Date of Patent: February 24, 1987
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takashi Suzuki, Kunio Hibino, Mikio Murai, Shigeki Kawase, Koichi Shinohara, Norimoto Nouchi
  • Magnetic recording medium
    Patent number: 4540618
    Abstract: A magnetic recording media, e.g. VTR tape is improved by providing an undercoating layer on a polyester film substrate, the undercoating layer being formed under a ferromagnetic thin film and being an even-scattering of a large number of inorganic or organic granules distributed at a rate of 1000/mm.sup.2 or more.
    Type: Grant
    Filed: August 8, 1983
    Date of Patent: September 10, 1985
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takashi Suzuki, Kunio Hibino, Mikio Murai, Shigeki Kawase, Koichi Shinohara
  • Polyester substrate for magnetic recording medium having oligomer protrusions thereon
    Patent number: 4514451
    Abstract: A magnetic recording media comprises a polyester substrate having 1000/mm.sup.2 or more protrusions of polyester oligomer, and a ferromagnetic thin film of 400 .ANG. or larger thickness both formed on the surface of the polyester substrate; the recording media has substantially no squealing even at 30.degree. C. at over 80% relative humidity.
    Type: Grant
    Filed: July 18, 1983
    Date of Patent: April 30, 1985
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takashi Suzuki, Koichi Shinohara, Masaru Odagiri, Takashi Fujita, Shigeki Kawase