Patents by Inventor Kazuhiro Umezane

Kazuhiro Umezane 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).

  • Gap-providing ferrite core half and method for producing same
    Patent number: 6232864
    Abstract: The gap-providing ferrite core half is produced by grinding an abutting surface of a ferrite core half by a rotating grinder with a rotation shaft inclined by 0.
    Type: Grant
    Filed: November 3, 1997
    Date of Patent: May 15, 2001
    Assignee: Hitachi Metals, Ltd.
    Inventors: Takashi Hosozawa, Kazuhiro Umezane
  • Gap-providing ferrite core half and method for producing same
    Patent number: 5816894
    Abstract: The gap-providing ferrite core half is produced by grinding an abutting surface of a ferrite core half by a rotating grinder with a rotation shaft inclined by 0.1.degree.-45.degree. relative to a line vertical to a surface of the ferrite core half to be ground in a plane parallel to a core width direction, so that the resultant gap-providing recess is constituted by a concave elliptical plane expressed by the following formula: ##EQU1## wherein A is a width of the ferrite core half, R is an effective radius of the grinder, .theta. is an inclination angle of the rotation shaft of the grinder relative to a line vertical to a surface of the ferrite core half to be ground, and G is a gap depth.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: October 6, 1998
    Assignee: Hitachi Metals, Ltd.
    Inventors: Takashi Hosozawa, Kazuhiro Umezane