Patents by Inventor Friedhelm Bultmann

Friedhelm Bultmann 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).

  • Method for thermal disposal of sewage sludge
    Patent number: 5190672
    Abstract: A method of thermal disposal of sewage sludge. The sludge is dried and incinerated. The flue gases from the incineration are washed. The flue gas dust resulting from the incineration and the sludge resulting from washing of the flue gases are treated together with high temperature combustion which includes melting of solids.
    Type: Grant
    Filed: May 22, 1991
    Date of Patent: March 2, 1993
    Assignee: Passavant-Werke AG
    Inventors: Hubert Coenen, Helmut Hubert, Friedhelm Bultmann, Matthias Brunner