Patents by Inventor Eberthard Kast

Eberthard Kast 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 the thermomechanical treatment of steel
    Patent number: 6939418
    Abstract: A process for thermomechanical treatment of steel for torsionally-strained spring elements, the initial material being heated with a heating rate of at least 50 K/s and austenitized, and then, being formed in at least one forming step with the formed product being quenched to below the martensite temperature to martensite and then tempered. To improve the strength or toughness properties of the spring steel in the strain direction of the torsionally strained spring elements so that the increase of vibration strength is considerable, the initial material is heated to a temperature above the recrystallization temperature and then formed at such a temperature, that dynamic and/or static recrystallization of the austenite occurs, and that the recrystallized austenite of the formed product is quenched.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: September 6, 2005
    Assignee: Muhr und Bender
    Inventors: Christian Bilgen, Eberthard Kast, Andreas Kleemann, Hans-Günther Krull, Thomas Muhr, Horst Weiss
  • Process for the thermomechanical treatment of steel
    Patent number: 6458226
    Abstract: A process for thermomechanical treatment of steel for torsionally-strained spring elements, the initial material being heated with a heating rate of at least 50 K/s and austenitized, and then, being formed in at least one forming step with the formed product being quenched to below the martensite temperature to martensite and then tempered. To improve the strength or toughness properties of the spring steel in the strain direction of the torsionally strained spring elements so that the increase of vibration strength is considerable, the initial material is heated to a temperature above the recrystallization temperature and then formed at such a temperature, that dynamic and/or static recrystallization of the austenite occurs, and that the recrystallized austenite of the formed product is quenched.
    Type: Grant
    Filed: July 20, 1999
    Date of Patent: October 1, 2002
    Assignee: Muhr und Bender
    Inventors: Christian Bilgen, Eberthard Kast, Andreas Kleemann, Hans-Günther Krull, Thomas Muhr, Horst Weiss