Patents by Inventor Tetsuji Hayakawa

Tetsuji Hayakawa 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).

  • Process for producing magnets having improved corrosion resistance
    Patent number: 5316595
    Abstract: Fe-B-R type permanent magnet is produced by: forming an anticorrosive coating film layer on a Fe-B-R base permanent magnet material body by means of vapor deposition to thereby improve the corrosion resistance thereof.The anticorrosive thin film is formed of metal, oxides, nitrides, carbides, borides, silicides, composite compositions thereof, or a mixture thereof. Additionally blasting, shot peening, heat treatment for forming an interdiffusion layer, and/or resin impregnation may be applied.
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: May 31, 1994
    Assignee: Sumitomo Special Metals Co., Ltd.
    Inventors: Takaki Hamada, Tetsuji Hayakawa, Yutaka Matsuura
  • Magnets having improved corrosion resistance
    Patent number: 5089066
    Abstract: Fe-B-R type permanent magnet is produced by forming an anticorrosive coating film layer on a Fe-B-R base permanent magnet material body by means of vapor deposition to thereby improve the corrosion resistance thereof.The anticorrosive thin film is formed of metal, oxides, nitrides, carbides, borides, silicides, composite compositions thereof, or a mixture thereof. Additionally blasting, shot peening, heat treatment for forming an interdiffusion layer, and/or resin impregnation may be applied.
    Type: Grant
    Filed: June 1, 1989
    Date of Patent: February 18, 1992
    Assignee: Sumitomo Speical Metals Co., Ltd.
    Inventors: Takaki Hamada, Tetsuji Hayakawa, Yutaka Matsuura
  • Process for producing magnets having improved corrosion resistance
    Patent number: 4837114
    Abstract: Fe-B-R type permanent magnet is produced by: forming an anticorrosive coating film layer on a Fe-B-R base permanent magnet material body by means of vapor deposition to thereby improve the corrosion resistance thereof.The anticorrosive thin film is formed of metal, oxides, nitrides, carbides, borides, silicides, composite compositions thereof, or a mixture thereof. Additionally blasting, shot peening, heat treatment for forming an interdiffusion layer, and/or resin impregnation may be applied.
    Type: Grant
    Filed: January 13, 1986
    Date of Patent: June 6, 1989
    Assignee: Sumitomo Special Metals Co., Ltd.
    Inventors: Takaki Hamada, Tetsuji Hayakawa, Yutaka Matsuura