Patents by Inventor Asa Malmqvist

Asa Malmqvist 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 biological cleaning of wastewater
    Patent number: 6946074
    Abstract: A method for biological purification of wastewater is disclosed, wherein the wastewater is purified in a biofilm process followed by an activated sludge process. The biological degradation in the biofilm process is performed under limitation of one of the nutrient salts nitrogen or phosphorous, and the surplus sludge from the biofilm process is allowed to pass to the activated sludge process.
    Type: Grant
    Filed: January 28, 2002
    Date of Patent: September 20, 2005
    Assignee: Kaldnes Miljøteknologi
    Inventors: Asa Malmqvist, Thomas Welander
  • Method for biological cleaning of wastewater
    Publication number: 20020179524
    Abstract: A method for biological purification of wastewater is disclosed, wherein the wastewater is purified in a biofilm process followed by an activated sludge process. The biological degradation in the biofilm process is performed under limitation of one of the nutrient salts nitrogen or phosphorous, and the surplus sludge from the biofilm process is allowed to pass to the activated sludge process.
    Type: Application
    Filed: January 28, 2002
    Publication date: December 5, 2002
    Inventors: Asa Malmqvist, Thomas Welander