Patents by Inventor Tatsuya KAGOHASHI

Tatsuya KAGOHASHI 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).

  • Permanent magnet production method
    Patent number: 9199402
    Abstract: With a mandrel inserted in a through hole formed in an extrusion die, a preform filled in the through hole is extruded into a filling space defined between an inner surface of the through hole and an outer surface of the mandrel by pressing the preform with a pressing punch. Consequently, a cylindrical extruded form in which a plurality of stress concentration portions extending along an extruding direction are formed so as to be spaced apart from each other in a circumferential direction is formed. Then, an external force is applied to the extruded form thus obtained to thereby divide the extruded form at the stress concentration portions into a plurality of permanent magnets.
    Type: Grant
    Filed: January 8, 2013
    Date of Patent: December 1, 2015
    Assignees: DAIDO STEEL CO., LTD., DAIDO ELECTRONICS CO., LTD.
    Inventors: Hiroshi Miyawaki, Toshiyuki Morita, Tatsuya Kagohashi
  • PERMANENT MAGNET PRODUCTION METHOD
    Publication number: 20130175728
    Abstract: With a mandrel inserted in a through hole formed in an extrusion die, a preform filled in the through hole is extruded into a filling space defined between an inner surface of the through hole and an outer surface of the mandrel by pressing the preform with a pressing punch. Consequently, a cylindrical extruded form in which a plurality of stress concentration portions extending along an extruding direction are formed so as to be spaced apart from each other in a circumferential direction is formed. Then, an external force is applied to the extruded form thus obtained to thereby divide the extruded form at the stress concentration portions into a plurality of permanent magnets.
    Type: Application
    Filed: January 8, 2013
    Publication date: July 11, 2013
    Applicants: Daido Electronics Co., Ltd., Daido Steel Co., Ltd.
    Inventors: Hiroshi MIYAWAKI, Toshiyuki MORITA, Tatsuya KAGOHASHI