Patents by Inventor Hartmut Wetjen

Hartmut Wetjen 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).

  • Casting or injection molding of multi-layered shoe soles
    Patent number: 4149696
    Abstract: The bottom or tread layer 18 of a shoe sole 17 is formed with a beaded flange 26 extending outwardly around its upper edge, which serves as a barrieragainst the incursion of the material of the upper sole layer 19 into the side face region 20 of the sole during the casting or moulding of the upper layer. The flange is subsequently removed to leave a clean separation line between the two sole layers.
    Type: Grant
    Filed: November 3, 1977
    Date of Patent: April 17, 1979
    Assignee: Desma-Werke GmbH
    Inventors: Friedrich Koch, Hartmut Wetjen, Werner Klee, deceased, Peter Rafalski