Patents by Inventor Keiichi Chabata

Keiichi Chabata 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).

  • Power source apparatus including a plurality of output current amplifiers connected in parallel and MRI apparatus using the same
    Patent number: 5721490
    Abstract: A power source apparatus distributes a current command value to be supplied to a load to a plurality of output current amplifiers connected in parallel with the load, and each of the output current amplifiers supplies an output current corresponding to the current command value so distributed. This power source apparatus prevents a circulating current between the output current amplifiers by controlling each output current amplifier so that the difference between the output current from each output current amplifier and the distributed current command value becomes zero, or by inserting current limiting devices into the output line of each output current amplifier.
    Type: Grant
    Filed: February 7, 1996
    Date of Patent: February 24, 1998
    Assignee: Hitachi Medical Corporation
    Inventors: Hiroshi Takano, Hiroyuki Takeuchi, Keiichi Chabata, Takuya Domoto, Takanobu Hatakeyama