Patents by Inventor Dierk Durwald

Dierk Durwald 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).

  • Turbulent waterway
    Patent number: 4392434
    Abstract: Disclosed is a turbulent waterway having boats guided in a trough extending between an uphill starting point and a downhill terminus, a chain conveyor having a series of links extending on a slope between said starting point and said terminus and adapted to travel upwardly therebetween, at least one locking bar with transverse grooves is adapted to mesh with the links of said chain conveyor supporting said links for sliding therealong.
    Type: Grant
    Filed: February 10, 1981
    Date of Patent: July 12, 1983
    Assignee: Mannesmann Demag AG
    Inventors: Dierk Durwald, Karl-Ernst Kaufmann