Patents by Inventor Koji Hiya

Koji Hiya 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).

  • Patent number: 4326908
    Abstract: A process for producing roll-shaped magnets which may be used in electrophotographic copying machines or the like. At least two types of composite magnet sheets of different magnetic characteristics, each having a magnetic orientation in the thickness direction, are superposed to form a laminated body. A plurality of wedge-shaped indentations are formed in one side of the laminated body. The laminated body is then wound around a shaft so that its surface having the indentations constitutes the inner peripheral surface. A magnetization is then effected. This process conveniently permits the full magnetization of the laminated body to ensure a high quality and superior characteristic of the products, as well as a high productivity. during the mass production of such magnets.
    Type: Grant
    Filed: March 7, 1980
    Date of Patent: April 27, 1982
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Koji Hiya, Yoshiyuki Miyoshi, Kanji Machida