Patents by Inventor Nils Lippmann

Nils Lippmann 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 for heat-treating work pieces made of temperature-resistant steels
    Patent number: 7108756
    Abstract: A method of producing a workpiece of a heat-resistant steel, such as hot forming tool steel, where the workpiece may be hardened and depassivated after mechanical machining and electrochemical treatment. The hardening including a reduction step, so that no depassivation need be performed by pickling, for example, before nitriding. The result of the hardening treatment is a favorable surface condition for stepwise nitriding.
    Type: Grant
    Filed: September 24, 2002
    Date of Patent: September 19, 2006
    Assignee: Robert Bosch GmbH
    Inventors: Nils Lippmann, Wolfgang Lerche
  • Method for heat-treating work pieces made of temperature-resistant steels
    Publication number: 20040055670
    Abstract: A method of producing a workpiece of a heat-resistant steel, in particular hot forming tool steel, is described, the workpiece being hardened and depassivated after mechanical machining and electrochemical treatment, the hardening including a reduction step, so that no depassivation need be performed by pickling, for example, before nitriding, and the result of the hardening treatment is a favorable surface condition for stepwise nitriding.
    Type: Application
    Filed: October 22, 2003
    Publication date: March 25, 2004
    Inventors: Nils Lippmann, Wolfgang Lerche