Patents by Inventor Nina Sjodahl

Nina Sjodahl 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 making a cemented carbide
    Patent number: 9827612
    Abstract: The present invention relates to a method of making a cemented carbide comprising mixing in a slurry a first powder fraction and a second powder fraction, subjecting the slurry to milling, drying, pressing and sintering. The first powder fraction is made from cemented carbide scrap recycled using the Zn recovery process, comprising the elements W, C, Co, and at least one or more of Ta, Ti, Nb, Cr, Zr, Hf and Mo, and the second powder fraction comprising virgin raw materials of WC and possibly carbides and/or carbonitrides of one or more of Cr, Zr, W, Ta, Ti, Hf and Nb. The first powder fraction is subjected to a pre-milling step, prior to the step of forming the slurry, to obtain an average grain size of between 0.2 to 1.5 ?m.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: November 28, 2017
    Assignee: SANDVIK INTELLECTUAL PROPERTY AB
    Inventors: Andreas Hedin, Susanne Norgren, Nina Sjodahl, Jose Garcia
  • METHOD OF MAKING A CEMENTED CARBIDE
    Publication number: 20150063930
    Abstract: The present invention relates to a method of making a cemented carbide comprising mixing in a slurry a first powder fraction and a second powder fraction, subjecting the slurry to milling, drying, pressing and sintering. The first powder fraction is made from cemented carbide scrap recycled using the Zn recovery process, comprising the elements W, C, Co, and at least one or more of Ta, Ti, Nb, Cr, Zr, Hf and Mo, and the second powder fraction comprising virgin raw materials of WC and possibly carbides and/or carbonitrides of one or more of Cr, Zr, W, Ta, Ti, Hf and Nb. The first powder fraction is subjected to a pre-milling step, prior to the step of forming the slurry, to obtain an average grain size of between 0.2 to 1.5 ?m.
    Type: Application
    Filed: December 19, 2012
    Publication date: March 5, 2015
    Inventors: Andreas Hedin, Susanne Norgren, Nina Sjodahl, Jose Garcia