Patents by Inventor Helmut Proefrock

Helmut Proefrock 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).

  • Coating consisting of hypereutectic aluminum/silicon alloy and/or an aluminum/silicon composite material
    Patent number: 6221504
    Abstract: A tribological coating made of a copper-free highly hypereutectic aluminum/silicon alloy and/or of a copper-free aluminum/silicon composite material composed such that fine silicon primary crystals and/or silicon particles, intermetallic phases, and oxides form as hard particles during the production of the layers in the atmospheric thermal spraying method and/or are anchored in the structure. The surface of the coating can be machined economically by short-chipping using conventional tools, so that additional alloy elements such as copper for forming additional intermetallic phases such as Al2Cu can be eliminated. This is significant because conventional AlSi cylinder liners in reciprocating engines pose problems in conjunction with certain fuels because of their copper content.
    Type: Grant
    Filed: August 3, 1998
    Date of Patent: April 24, 2001
    Assignee: DaimlerChrysler AG
    Inventors: Harald Pfeffinger, Micheal Voit, Tilman Haug, Patrick Izquierdo, Herbert Gasthuber, Oliver Storz, Axel Heuberger, Franz Rueckert, Peter Stocker, Helmut Proefrock
  • Coating for a cylinder of a reciprocating engine
    Patent number: 6080360
    Abstract: A coating for a cylinder bore of a reciprocating engine with an iron, aluminum, or magnesium base comprises a hypereutectic aluminum/silicon alloy. The alloy is applied to a cylinder wall by thermal spraying.
    Type: Grant
    Filed: August 3, 1998
    Date of Patent: June 27, 2000
    Assignee: DaimlerChrysler AG
    Inventors: Harald Pfeffinger, Micheal Voit, Tilman Haug, Patrick Izquierdo, Herbert Gasthuber, Wolfgang Reichle, Axel Heuberger, Franz Rueckert, Peter Stocker, Helmut Proefrock