Patents by Inventor Tetsuhiko Migita

Tetsuhiko Migita 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).

  • Methods of casting pneumatic tires
    Patent number: 4075275
    Abstract: A method for casting pneumatic tires by pouring a fluidized tire-forming material into a molding cavity defined between the outer peripheral surface of a separable hard core of a mold assembly and the inner peripheral surface of an outer separable hard mold member of the mold assembly. The separable hard core is composed of at least three segments and toroidal in shape. At least one segment of the separable core is retracted in a radial direction and then moved in a direction which does not hinder retractive movement of the remaining segments and subsequently these remaining segments are retracted in the radial direction, whereby the cast tire can easily be removed from the mold assembly.
    Type: Grant
    Filed: August 4, 1976
    Date of Patent: February 21, 1978
    Assignee: Bridgestone Tire Company Limited
    Inventors: Kazuhiro Nishimura, Jumei Harada, Tetsuhiko Migita, Tsutomu Matsunaga
  • Apparatuses for casting pneumatic tires
    Patent number: 3994650
    Abstract: A method of and apparatus for casting pneumatic tires by pouring a fluidized tire-forming material into a molding cavity defined between the outer peripheral surface of a separable hard core of a mold assembly and the inner peripheral surface of an outer separable hard mold member of the mold assembly. The separable hard core is composed of at least three segments and toroidal in shape. At least one segment of the separable core guidingly is retracted in a radial direction and then moved in a direction which does not hinder retractive movement of the remaining segments and subsequently these remaining segments are retracted in the radial direction, whereby the cast tire can easily be removed from the mold assembly.
    Type: Grant
    Filed: April 15, 1975
    Date of Patent: November 30, 1976
    Assignee: Bridgestone Tire Company Limited
    Inventors: Kazuhiro Nishimura, Jumei Harada, Tetsuhiko Migita, Tsutomu Matsunaga
  • Flexible annular core used for the production of hollow toroidal rubber shells
    Patent number: 3932088
    Abstract: A flexible annular core for the production of hollow toroidal rubber shells, particularly pneumatic tires, composed of a pair of bead portions, each of which is composed of beads, a reinforcing layer folded back so as to enclose the beads, and elastomer layers covering the reinforcing layer, and a flexible shell portion composed of the reinforcing layer covered with the elastomer layers and extending across the bead portions. The bead portion of said flexible annular core is composed of the reinforcing layer and the elastomer layer adhered with each other. The flexible shell portion of said core is composed of the reinforcing layer and the elastomer layer not adhered with each other.
    Type: Grant
    Filed: July 31, 1974
    Date of Patent: January 13, 1976
    Assignee: Bridgestone Tire Company Limited
    Inventors: Jumei Harada, Kenji Tsukamoto, Tetsuhiko Migita, Tsutomu Matsunaga