Patents by Inventor Tokutaro Kubomura

Tokutaro Kubomura 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).

  • Transformer and coil bobbin therefor
    Patent number: 6320492
    Abstract: A transformer comprising: a coil bobbin which includes a pair of core winding portions and a pair of coupling portions for coupling the core winding portions so as to space the core winding portions a predetermined distance from each other and is formed, on its whole outer periphery, with a groove; a winding which is obtained by winding a conductor around the groove of the coil bobbin a predetermined number of times; and a pair of wound cores each of which is obtained by winding an electromagnetic steel plate around each of the core winding portions of the coil bobbin a predetermined number of times; wherein an outer peripheral surface of each of opposite side walls of the groove at the core winding portions is curved so as to have an arcuate cross-sectional shape.
    Type: Grant
    Filed: September 16, 1999
    Date of Patent: November 20, 2001
    Assignees: WB Transformer Corporation, Nishimoto Gosei Hanbai Co., Ltd.
    Inventors: Tokutaro Kubomura, Shiro Kokura
  • Transformer and coil bobbin therefor
    Patent number: 6046663
    Abstract: A transformer comprising: a coil bobbin which includes a pair of core winding portions and a pair of coupling portions for coupling the core winding portions so as to space the core winding portions a predetermined distance from each other and is formed, on its whole outer periphery, with a groove; a winding which is obtained by winding a conductor around the groove of the coil bobbin a predetermined number of times; and a pair of wound cores each of which is obtained by winding an electromagnetic steel plate around each of the core winding portions of the coil bobbin a predetermined number of times; wherein an outer peripheral surface of each of opposite side walls of the groove at the core winding portions is curved so as to have an arcuate cross-sectional shape.
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: April 4, 2000
    Assignees: Kawatetsu Electric Engineering Co., Ltd., Nishimoto Gosei Hanbai Co., Ltd.
    Inventors: Tokutaro Kubomura, Shiro Kokura