Patents by Inventor Kunihiro Oikawa

Kunihiro Oikawa 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).

  • Magnetically driven centrifugal pump
    Patent number: 4047847
    Abstract: A magnetically driven centrifugal pump comprises a split plate for dividing a space within a housing into two parts-impeller chamber and rotor chamber, a shaft supported by an inner wall of said rotor chamber and the split plate and having an internal rotor, an external rotor disposed outside the housing to magnetically drive the internal rotor, a passage means for permitting the communication between the impeller chamber and rotor chamber, and a restricting means for reducing the pressure of a fluid passing through said passage means.
    Type: Grant
    Filed: March 24, 1976
    Date of Patent: September 13, 1977
    Assignee: Iwaki Co., Ltd.
    Inventor: Kunihiro Oikawa
  • Magnetically driven centrifugal pump and means providing cooling fluid flow
    Patent number: 4013384
    Abstract: A magnetically driven centrifugal pump comprising an impeller rotatably supported in a casing by means of a hollow shaft; passage means including the through hole of said hollow shaft for conducting part of a fluid so as to cool said shaft; and an auxiliary pump for forcing the fluid through said passage means, thereby preventing the shaft from being thermally seized or damaged even when the discharge pressure of the pump suddenly drops.
    Type: Grant
    Filed: March 7, 1975
    Date of Patent: March 22, 1977
    Assignee: Iwaki Co., Ltd.
    Inventor: Kunihiro Oikawa