Patents by Inventor Jan Elwart

Jan Elwart 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).

  • Hydraulic piston and process for its surface treatment
    Patent number: 6807897
    Abstract: The present invention relates to a hydraulic piston and a process for its surface treatment in order to improve above all the wear resistance and corrosion resistance at the surface of the piston. As a favorable manufacturing process for the surface treatment of an above-mentioned hydraulic piston, a multistage process is disclosed which arranges a nitrocarburization with a subsequent oxidation and a following mechanical solidification of the oxidized surface for the piston. As a result, several superposed layers—layer of oxide, connecting layer, diffusion layer—develop at the piston surface which exhibit the desired qualities.
    Type: Grant
    Filed: December 18, 2001
    Date of Patent: October 26, 2004
    Assignees: Bodycote Warmebehandlung GmbH, Continental Teves AG & Co., oHG, Sander KG
    Inventors: Alfred Birkenbach, Rolf Weiler, Uwe Zeibig, Martina Wägner, Jan Elwart
  • Hydraulic piston and process for its surface treatment
    Publication number: 20020104434
    Abstract: The present invention relates to a hydraulic piston and a process for its surface treatment in order to improve above all the wear resistance and corrosion resistance at the surface of the piston. As a favorable manufacturing process for the surface treatment of an above-mentioned hydraulic piston, a multistage process is disclosed which arranges a nitrocarburization with a subsequent oxidation and a following mechanical solidification of the oxidized surface for the piston. As a result, several superposed layers—layer of oxide, connecting layer, diffusion layer—develop at the piston surface which exhibit the desired qualities.
    Type: Application
    Filed: December 18, 2001
    Publication date: August 8, 2002
    Inventors: Alfred Birkenbach, Rolf Weiler, Uwe Zeibig, Martina Wagner, Jan Elwart
  • Device for glow potential processing, in particular ionic carburation
    Patent number: 5171369
    Abstract: In a device for glow potential processing the metallic workpieces are placed on an electroconductive charging plate. The device has an oven located within a chamber that can be evacuated. At least three supports of the charging plate are arranged in the inner space of the oven and a supply line for the electric connection of the charging plate opens into a glow potential. The supply line is composed of at least three support insulators that end below the charging plate. The supports or the at least three support insulators can be lifted and lowered, so that the charging plate rests on the supports only or on the support insulators only.
    Type: Grant
    Filed: February 19, 1991
    Date of Patent: December 15, 1992
    Inventors: Jan Elwart, Wolfgang Rembges
  • Frame for the support of articles which are to be treated
    Patent number: 4118624
    Abstract: An article support frame, removably supported in a glow discharge treatment receptacle, is provided with a plurality of upwardly open spherical seats, each having a laterally open entrance slot. Suspension devices which can be attached to the articles to be treated have necks in the entrance slots, spherical plugs removably seated on the spherical seats and transport plugs extending above the spherical plugs.
    Type: Grant
    Filed: April 25, 1977
    Date of Patent: October 3, 1978
    Assignee: Ionit Anstalt Bernhad Berghaus
    Inventors: Johannes Luckan, Jan Elwart, Martin Herter