Patents by Inventor Yuuji Yoshii

Yuuji Yoshii 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).

  • Control method of compressor motor and inverter equipped with the same method
    Patent number: 6646411
    Abstract: A control device for a compressor motor and an inverter according to the present invention monitors the amplitude of a phase current of a three-phase DC motor. As the amplitude of the phase current approaches an overload condition of the inverter or motor, the control device decreases the rotational velocity of the motor by a predetermined rotational deceleration. By reducing the rotational velocity of the motor by a certain deceleration, the control device of the present invention ensures that the motor load, i.e., the amplitude of the phase current, does not reach or exceed an overload condition. By use of this device, it is possible to suppress or reduce effectively the frequency of motor stops caused by an increase in the phase current.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: November 11, 2003
    Assignee: Sanden Corporation
    Inventors: Daisuke Hirono, Ichirou Kuwabara, Yuuji Yoshii
  • Control method of compressor motor and inverter equipped with the same method
    Publication number: 20020117992
    Abstract: A control device for a compressor motor and an inverter according to the present invention monitors the amplitude of a phase current of a three-phase DC motor. As the amplitude of the phase current approaches an overload condition of the inverter or motor, the control device decreases the rotational velocity of the motor by a predetermined rotational deceleration. By reducing the rotational velocity of the motor by a certain deceleration, the control device of the present invention ensures that the motor load, i.e., the amplitude of the phase current, does not reach or exceed an overload condition. By use of this device, it is possible to suppress or reduce effectively the frequency of motor stops caused by an increase in the phase current.
    Type: Application
    Filed: December 12, 2001
    Publication date: August 29, 2002
    Inventors: Daisuke Hirono, Ichirou Kuwabara, Yuuji Yoshii
  • Cement composition
    Patent number: 4434257
    Abstract: An improved cement composition having improved crack resistance, water resistance, and which comprises a mixture of a conventional cement composition with an ethylene-vinyl acetate copolymer emulsion containing 1 to 10 parts by weight of a polyvinyl alcohol and 0.1 to 10 parts by weight of a higher fatty acid ester of a polyvalent alcohol having an HLB of 10 or less per 100 parts by weight of the solid resin components of the emulsion.
    Type: Grant
    Filed: September 21, 1982
    Date of Patent: February 28, 1984
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Shizuo Narisawa, Yoshito Taira, Yuuji Yoshii, Tomizou Kondou