Patents by Inventor Sanwen Qi

Sanwen Qi 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).

  • Temper process of sintered Nd-Fe-B permanent magnet
    Patent number: 7377985
    Abstract: The present invention provides a tempering process for sintered Nd—Fe—B permanent magnet material, which optimizes the microstructure of the Nd—Fe—B magnet and improves intrinsic coercive force and its consistency by increasing the cooling rate after tempering. After heating to a temper temperature, the magnetic material is cooled in a cooling liquid within a cooling chamber into which a pressurized cooling gas is introduced.
    Type: Grant
    Filed: December 9, 2005
    Date of Patent: May 27, 2008
    Assignee: Shanxi Huiqiang Magnetic Material Manufacturing Co., Ltd.
    Inventors: Min Zhang, Fengrui Zhang, Zhendong Kang, Sanwen Qi
  • Temper process of sintered Nd-Fe-B permanent magnet
    Publication number: 20060086428
    Abstract: The present invention provides a tempering process for sintered Nd—Fe—B permanent magnet material, which optimizes the microstructure of the Nd—Fe—B magnet and improves intrinsic coercive force and its consistency by increasing the cooling rate after tempering. After heating to a temper temperature, the magnetic material is cooled in a cooling liquid within a cooling chamber into which a pressurized cooling gas is introduced.
    Type: Application
    Filed: December 9, 2005
    Publication date: April 27, 2006
    Applicant: Shanxi Huiqiang Magnetic Material Manufacturing Co., Ltd.
    Inventors: Min Zhang, Fengrui Zhang, Zhendong Kang, Sanwen Qi