Patents by Inventor Takehiko Iwahana

Takehiko Iwahana 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: 4273054
    Abstract: In an induced repulsion type magnetic suspension system for a railway vehicle, superconductive magnets of opposite polarities are alternately set at specific intervals in the longitudinal direction of vehicle, while in the longitudinal direction of the track conductive loop coils or conductive sheets are continuously set at specific intervals, whereby the repulsion due to the eddy current caused by a voltage induced in said conductive loop coils or conductive sheets by the superconductive magnets and said superconductive magnets levitates the vehicle. In this invention, an additional source to produce a magnetic field of the same polarity is provided on the vehicle; and thereby a magnetic flux with the same period as the vehicle vibration is applied which intersects said conductive loop coils or conductive sheets on the ground when the vehicle vibrates.
    Type: Grant
    Filed: December 29, 1977
    Date of Patent: June 16, 1981
    Assignee: Japanese National Railways
    Inventors: Hiroshi Yamashita, Takehiko Iwahana, Shunsuke Fujiwara