Patents by Inventor Rainer Wallwitz

Rainer Wallwitz 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).

  • Phosphate recovery from sludge
    Patent number: 9061221
    Abstract: A process for recovering reusable materials, in particular phosphate, from sewage sludge products, namely sewage sludge, sewage sludge ash or sewage sludge slag, by extraction, in which a suspension of the sewage sludge product is produced in water, alcohol, water-alcohol mixture or an aqueous solution, gaseous carbon dioxide (CO2) or supercritical carbon dioxide (scCO2) is introduced as an extraction agent into the suspension of the sewage sludge product, undissolved solids are separated from the liquid suspension agent, carbon dioxide is removed from the suspension agent, and reusable materials dissolved in the suspension agent are precipitated and separated from the suspension agent.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: June 23, 2015
    Assignee: CHEMISCHE FABRIK BUDENHEIM KG
    Inventors: Rüdiger Wissemborski, Rainer Schnee, Rainer Wallwitz, David Kümmet
  • PHOSPHATE RECOVERY FROM SLUDGE
    Publication number: 20120070360
    Abstract: A process for recovering reusable materials, in particular phosphate, from sewage sludge products, namely sewage sludge, sewage sludge ash or sewage sludge slag, by extraction, in which a suspension of the sewage sludge product is produced in water, alcohol, water-alcohol mixture or an aqueous solution, gaseous carbon dioxide (CO2) or supercritical carbon dioxide (scCO2) is introduced as an extraction agent into the suspension of the sewage sludge product, undissolved solids are separated from the liquid suspension agent, carbon dioxide is removed from the suspension agent, and reusable materials dissolved in the suspension agent are precipitated and separated from the suspension agent.
    Type: Application
    Filed: April 30, 2010
    Publication date: March 22, 2012
    Inventors: Rüdiger Wissemborski, Rainer Schnee, Rainer Wallwitz, David Kümmet