Patents by Inventor Per Engdahl

Per Engdahl 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).

  • Use of a powder composition and a medium
    Publication number: 20080044346
    Abstract: The invention relates to the use of a powder composition comprising at least 95% by weight of magnetite (Fe3O4) particles as a magnetisable component in a medium for magnetically storing information. At least 99.9% by weight of the magnetite particles have a particle size of less than 5 ?m, and the magnetite particles have a polyhedral shape and essentially isotropic magnetic properties. The magnetite particles have a saturation magnetisation of 75-95 emu/g at 10 kOe, a remanence of 20-40 emu/g and a coercivity of 250-500 Oe. The invention also relates to the medium for magnetically storing information comprising magnetite particles.
    Type: Application
    Filed: August 15, 2007
    Publication date: February 21, 2008
    Applicant: HOGANAS AB
    Inventors: Lars Hultman, Rose-Marie Yttergren, Per Engdahl
  • Iron based powder containing Mo, P and C
    Patent number: 5918293
    Abstract: An iron-based powder for producing components by powder compacting and sintering consists essentially of 0.6-2.0% by weight of Mo, 0.2-0.8% by weight of P, 0-2% by weight of Cu, 0-0.3% by weight of Mn, 0.2-0% by weight of C, and not more than 1 % by weight of inevitable impurities.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: June 29, 1999
    Assignee: Hoganas AB
    Inventors: Caroline Lindberg, Per Engdahl
  • Iron based powder, component produced therefrom and method of producing the component
    Patent number: 5728238
    Abstract: An iron-based powder for producing impact-resistant components by powder compacting and sintering contains, in addition to Fe, 0.3-0.7% by weight of P, 0.3-3.5% by weight of Mo, and not more than 2% by weight of other alloying elements. A method of powder-metallurgically producing impact-resistant steel components comprises using an iron-based powder which, in addition to Fe, contains 0.3-0.7% by weight of P, preferably 0.35-0.65% by weight of P, 0.3-3.5% by weight of Mo, preferably 0.5-2.5% by weight of Mo, and not more than 2% by weight, preferably not more than 1% by weight, of other alloying elements; compacting the powder into the desired shape; and sintering the compact.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: March 17, 1998
    Assignee: Hoganas AB
    Inventors: Per Engdahl, Caroline Lindberg
  • Iron-based powder containing chromium, molybdenum and manganese
    Patent number: 5703304
    Abstract: The invention concerns an iron-based powder for powder-metallurgically producing components by powder compacting and sintering. The powder which essentially consists of 0.7-2.0% of Mo, 0.2-2.5% by weight of Cr and 0-3.0% by weight of Cu, 0.05-0.25% by weight of Mn and 0.3-1.0% by weight of C, wherein Fe, Mo and Mn are present as a prealloyed, water atomised FeMoMn base powder, Cr is present as FeCr, Cu is present as a metal or partially prealloyed powder and C is present as a graphite, exhibits very interesting properties. The invention also includes a method for preparing sintered components from this iron powder.
    Type: Grant
    Filed: February 6, 1997
    Date of Patent: December 30, 1997
    Assignee: Hoganas AB
    Inventors: Caroline Lindberg, Per Engdahl
  • Iron-based powder, component made thereof, and method of making the component
    Patent number: 5403371
    Abstract: An iron-based powder for making wear-resisting and heat-resisting components by compacting and sintering consists of, in addition to Fe, 3-15% by weight of Mo and/or 3-20% by weight of W, the total amount of Mo+W being in the range off 3-20% by weight; 0.2-1.0% by weight of P; 0.5-1.5% by weight of C. A component is powder-metallurgically made of this iron-based powder by compacting the powder into the desired shape and sintering the compact at a temperature below about 1150.degree. C.
    Type: Grant
    Filed: November 10, 1992
    Date of Patent: April 4, 1995
    Assignee: Hoganas AB
    Inventors: Per Engdahl, Dragan Spasic, Ralf Johansson