Patents by Inventor Takeshi Yatsuka

Takeshi Yatsuka 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).

  • Viscoelastic resin for vibration damping material and composition containing the same
    Patent number: 4942219
    Abstract: The use of an amorphous block copolyester resin as a viscoelastic resin for a composite vibration damping material, and a viscoelastic resin composition for a composite vibration damping material which comprises the amorphous block copolyester resin and at least one compound selected from the group consisting of polyepoxy compounds, polyisocyanate compounds and acid anhydrides.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: July 17, 1990
    Assignees: Toyo Boseki Kabushiki Kaisha, Nippon Steel Corporation
    Inventors: Takeshi Yatsuka, Seiji Yamazoe, Hiroshi Hirakouchi, Yutaka Mizumura, Hiroshi Endo, Nobuo Kadowaki
  • Magnetic recording medium
    Patent number: 4842942
    Abstract: A magnetic recording medium prepared by applying a magnetic material onto a non-magnetic support, said coating material containing fine ferromagnetic particles dispersed in a binder and curing said magnetic coating material, characterized in that said binder comprises a thermoplastic resin or a radiation-curable resin wherein there is chemically bonded to the resin at least one phosphorous compound represented by the following formulae: ##STR1## wherein, X, Y and R.sub.1 -R.sub.5 is as disclosed herein. The present invention also relates to a method of producing said recording medium.
    Type: Grant
    Filed: August 8, 1985
    Date of Patent: June 27, 1989
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Takeshi Yatsuka, Nobukazu Kotera, Yutaka Mizumura