Patents by Inventor Xing Long Dong

Xing Long Dong 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).

  • Method of producing Nd-Fe-B based nanophase power
    Patent number: 6676730
    Abstract: The present invention relates to a method of producing Nd—Fe—B based nanophase powder, or more particularly, to a method of producing Nd2Fe14B phase powder of 1 &mgr;m or less, having Nd2Fe14B crystal grains of 50 nm or less, which comprises the following steps of: producing a precursor powder having a mixture of elements of Nd, Fe and B by means of spray-drying a mixed aqueous solution comprising Nd metal salt, Fe metal salt, and boric acid; producing an oxide composite powder by means of desaltation of said powder; reducing the composite oxide powder, and ball-milling of said composite powder comprising Nd oxides and &agr;-Fe; producing a mixed powder of Nd2Fe14B/CaO phase by mixing Ca to said composite powder after milling; and removing CaO by washing said composite powder with water, followed by drying.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: January 13, 2004
    Assignee: Korea Institute of Machinery and Materials
    Inventors: Byung Kee Kim, Chul Jin Choi, Xing Long Dong
  • Method of producing Nd-Fe-B based nanophase power
    Publication number: 20020005088
    Abstract: The present invention relates to a method of producing Nd—Fe—B based nanophase powder, or more particularly, to a method of producing Nd2Fe14B phase powder of 1 &mgr;m or less, having Nd2Fe14B crystal grains of 50 nm or less, which comprises the following steps of: producing a precursor powder having a mixture of elements of Nd, Fe and B by means of spray-drying a mixed aqueous solution comprising Nd metal salt, Fe metal salt, and boric acid; producing an oxide composite powder by means of desaltation of said powder; reducing the composite oxide powder, and ball-milling of said composite powder comprising Nd oxides and &agr;-Fe; producing a mixed powder of Nd2Fe14B/CaO phase by mixing Ca to said composite powder after milling; and removing CaO by washing said composite powder with water, followed by drying.
    Type: Application
    Filed: May 23, 2001
    Publication date: January 17, 2002
    Applicant: Korea Institute of Machinery and Materials
    Inventors: Byung Kee Kim, Chul Jin Choi, Xing Long Dong