Patents by Inventor Rolf Klassen

Rolf Klassen 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).

  • Removal of metal ions from process wastewaters
    Patent number: 5164091
    Abstract: Metal ions are removed from process wastewaters by using an electrically conducting, cathodically polarized filter-aid layer whose potential is at least 50 mV more negative than the redox potential of the metal ions to be removed, by passing the metal ion-containing water through the filter-aid layer and periodically renewing the filter-aid layer at intervals of from 2 to 180 minutes by backwashing, classifying and precoating processes.
    Type: Grant
    Filed: September 24, 1991
    Date of Patent: November 17, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Guenther Huber, Wolfgang Habermann, Walter Goesele, Rolf Klassen