Patents by Inventor Arihiro Yonezawa

Arihiro Yonezawa 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).

  • Bearing device with a primary and secondary magnetic fluid sealing mechanism
    Patent number: 5675199
    Abstract: A bearing device with a primary and secondary magnetic fluid seal for use in a motor. A shaft and a frame in the motor are interconnected by a bearing. A magnetic fluid is placed in a region between the shaft and frame. The primary magnetic fluid seal is positioned above the bearing and the secondary magnetic fluid seal is positioned above the primary magnetic fluid seal to form a two-layered seal.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: October 7, 1997
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventors: Toshihiko Miyakoshi, Arihiro Yonezawa, Tamotsu Nose
  • Fluid bearing unit and manufactured method thereof
    Patent number: 5628569
    Abstract: A fluid bearing unit includes a shaft; a bearing; bearing fluid arranged between a shaft and a bearing which are rotatably engaged with each other so that they can be relatively rotated so as to generate dynamic pressure in the bearing fluid, wherein at least one of the bearing and the member for fixing the bearing unit is made of iron alloy having the volumetric magnetostriction of which acts to cancel the thermal expansion so as to become the coefficient of linear expansion thereof lower than that of the shaft.
    Type: Grant
    Filed: October 18, 1994
    Date of Patent: May 13, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Masamichi Hayakawa, Masato Gomyo, Toshihiko Miyakoshi, Arihiro Yonezawa