Patents by Inventor Takao Sakai

Takao Sakai 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).

  • Patent number: 4701505
    Abstract: An olefin is polymerized by using a catalyst consisting essentially of (A) a solid catalyst component containing a magnesium halide and a titanium chloride, (B) an organic aluminum compound, and (C) an ether compound represented by the formula: R.sup.1 R.sup.2 R.sup.3 C(OR.sup.4), R.sup.1 R.sup.2 C(OR.sup.4).sub.2 or R.sup.1 C(OR.sup.4).sub.3. The catalyst has high catalytic activity and high stereoregularity as well as good activity endurance and is especially suitable for production of block copolymers.
    Type: Grant
    Filed: September 23, 1985
    Date of Patent: October 20, 1987
    Assignee: Mitsubishi Petrochemical Company Limited
    Inventors: Masaki Fujii, Takao Sakai, Hideo Sakurai, Yosiharu Yamamoto
  • Patent number: 4184796
    Abstract: An improvement of a globoid worm gear generating method based on the "basic member gear theory" and the "secondary action theory" both proposed by the same inventors is disclosed. In one form, the surface of a globoid worm generating tool is defined as the tooth surface of an intermediate gear by a conical surface whose semivertical angle .UPSILON., In another form, the surfaces of a globoid worm gear generating tool are defined by two conical surfaces whose semivertical angles are equal and satisfy the above condition and whose major axes as well as bottoms are coincident with each other so that both tooth surfaces of a worm may be simultaneously generated.
    Type: Grant
    Filed: June 21, 1977
    Date of Patent: January 22, 1980
    Inventors: Takao Sakai, Minoru Maki, Hisashi Tamura
  • Patent number: 4144421
    Abstract: A system for shutting down a hydraulic machine having a runner mounted on a rotating shaft and a stationary part or parts surrounding the runner, comprising a rod or rods installed on the stationary part or parts opposite to the periphery of the runner, each rod being yieldable to the pressure of the runner, in case of the latter's deformation or off-center displacement, so as to sense the gap between the runner and the stationary part, a member or members each adapted to be actuated when the stroke of the associated sensing rod has exceeded a predetermined value, and a shutdown device operable upon actuation of the said member.
    Type: Grant
    Filed: December 17, 1976
    Date of Patent: March 13, 1979
    Assignee: Hitachi, Ltd.
    Inventor: Takao Sakai