Patents by Inventor Karl-Heinz Hakert

Karl-Heinz Hakert 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).

  • Pressure roll for jacketing steel pipes with thermoplastic strip
    Patent number: 4178200
    Abstract: A roll or roller for urging extruded thermoplastic strip onto an axially advancing, rotating pipe is constructed from a silicon rubber core with a shore hardness of 40 and having a softer silicon rubber jacket with a shore hardness not exceeding 30. The core is traversed by axial bores.
    Type: Grant
    Filed: March 9, 1978
    Date of Patent: December 11, 1979
    Assignee: Mannesmann Aktiengesellschaft
    Inventors: Karl-Heinz Hakert, Walter Quitmann