Patents by Inventor Mineyo Endo

Mineyo Endo 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: 5225759
    Abstract: Starting, accelerating and rated rotation of a rotor is carried out without any detector for the rotor position. A motor is controlled with an openloop circuit a short time in a starting area of low speed rotation, and thus the motor can be certainly started. In a rated rotation area, turning timing of the motor is precisely controlled by detecting counter-electromotive force of a stator coil.
    Type: Grant
    Filed: March 14, 1989
    Date of Patent: July 6, 1993
    Assignee: Nippon Densan Corporation
    Inventors: Mineyo Endo, Yosuke Kawate
  • Patent number: 5009436
    Abstract: A magnetic fluid seal assembly comprising an annular sealing clearance communicating with an external space, an annular permanent magnet for forming a magnetic field in the sealing clearance, a ferromagnetic fluid retained in the sealing clearance by the magnetic field but rotationally movable in the sealing clearance, and a scattering preventive portion provided axially outwardly of the sealing clearance for preventing the ferromagnetic fluid from scattering to the external space when the ferromagnetic fluid is rotationally moved.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: April 23, 1991
    Assignee: Nippon Densan Corporation
    Inventors: Mineyo Endo, Kiyoyoshi Takegami, Noriaki Hishida, Itsuo Miyaji