Patents by Inventor Yasuhiro Nagatsuka

Yasuhiro Nagatsuka 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).

  • Magnetic field molding device, method for producing ferrite magnet, and die
    Patent number: 8066498
    Abstract: The objects of the present invention are to provide a magnetic field molding device capable of improving yield in a production and stabilizing product quality, and a method for producing a ferrite magnet. In molding in a magnetic field, the mortar-shaped die 19 provided with a plurality of the cavities 13 is heated by the heater member 20, provided in the heater block located under the mortar-shape die 19, under control of a controller at varying temperature depending on the position of the mortar-shape die 19, to keep uniform temperature of the slurry in the cavities 13. This assures good and stable slurry dehydration properties and improves product yield.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: November 29, 2011
    Assignee: TDK Corporation
    Inventors: Hideo Kurita, Yasuhiro Nagatsuka, Kiyoyuki Masuzawa, Masayuki Ohtsuka, Kazuyuki Sato
  • MAGNETIC FIELD MOLDING DEVICE, METHOD FOR PRODUCING FERRITE MAGNET, AND DIE
    Publication number: 20070069426
    Abstract: The objects of the present invention are to provide a magnetic field molding device capable of improving yield in a production and stabilizing product quality, and a method for producing a ferrite magnet. In molding in a magnetic field, the mortar-shaped die 19 provided with a plurality of the cavities 13 is heated by the heater member 20, provided in the heater block located under the mortar-shape die 19, under control of a controller at varying temperature depending on the position of the mortar-shape die 19, to keep uniform temperature of the slurry in the cavities 13. This assures good and stable slurry dehydration properties and improves product yield.
    Type: Application
    Filed: September 22, 2006
    Publication date: March 29, 2007
    Applicant: TDK CORPORATION
    Inventors: Hideo Kurita, Yasuhiro Nagatsuka, Kiyoyuki Masuzawa, Masayuki Ohtsuka, Kazuyuki Sato
  • Magnetic field forming device, ferrite magnet producing method, and mold
    Publication number: 20060219323
    Abstract: The objects of the present invention are to provide a magnetic field molding device, and method for producing a ferrite magnet, or the like, capable of improving yield in a production line and stabilizing product quality, and method for producing a ferrite magnet. In molding in a magnetic field, the mortar-shaped die 19 provided with a plurality of the cavities 13 is heated by the heater member 20 at a given temperature level, under the control of the controller 23. The temperature level is preferably controlled by the controller 23 at 40° C. or higher as mortar-shaped die 19 temperature T1, sensed by the sensor 22. A molding slurry can be kept at a high temperature level in the cavities 13 by heating the mortar-shaped die 19, and can have high dehydration properties and improve product yield.
    Type: Application
    Filed: March 30, 2005
    Publication date: October 5, 2006
    Inventors: Kiyoyuki Masuzawa, Hideo Kurita, Masayuki Ohtsuka, Yasuhiro Nagatsuka, Hitoshi Taguchi