Patents by Inventor Volker Stengelin

Volker Stengelin 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).

  • Device for biological digestion of sewage
    Patent number: 4251370
    Abstract: A device for biological digestion of sewage utilizes rotationally symmetric rotatable growth surfaces, preferably plastic immersion percolating filters, which filters are immersed in the sewage as they rotate. The growth surfaces are mounted upon an immersion cylinder that is rotatably driven and mounted within a gas-tight container according to a preferred embodiment. The drive for the immersion cylinder includes a drive pinion having teeth which engage stud bolts connecting rings forming part of the immersion cylinder.
    Type: Grant
    Filed: June 26, 1979
    Date of Patent: February 17, 1981
    Inventor: Volker Stengelin