Patents by Inventor Sigurd Schlegel

Sigurd Schlegel 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).

  • Biological waste water purification process and device
    Patent number: 6280624
    Abstract: Biological wastewater is purified in a sewage treatment plant having an activation tank of a depth greater than approximately 5 m per meter into which a feed of compressed air is fed. An oxygen-containing gas having an oxygen content is increased with respect to the air or pure oxygen and is fed to the mixed liquor in at least a part of the aerobic tank volume of the activation tank. The oxygen containing gas is fed until the total content of the gas in the mixed liquor based upon saturation value is below 150% before the mixed liquor is fed to a secondary clarification.
    Type: Grant
    Filed: June 21, 1999
    Date of Patent: August 28, 2001
    Assignee: Messer Griesheim GmbH
    Inventors: Monica Hermans, Ulrich Hermanns, Sigurd Schlegel, Andreas Stein