Patents by Inventor Laurens van der Tak

Laurens van der Tak 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).

  • Apparatus and method for the removal of solids and floatables from a wastewater stream
    Patent number: 7138048
    Abstract: An apparatus for removing particulates from a wastewater stream includes a chamber having a wastewater inlet and wastewater outlet which promotes a generally horizontal wastewater flow. A grating is provided in the chamber between the wastewater inlet and the wastewater outlet having a screen size for preventing the passage of particulates having greater than the select effective diameter from the wastewater inlet into the wastewater outlet. The grating is vertically inclined relative to the direction of the wastewater flow. A baffle within the chamber is configured to cooperate with the grating to generate a vortex in the wastewater having a velocity component parallel to the face of the grating which urges particles trapped by the grating along the grating toward a surface of the wastewater to suspend particles in the wastewater as the wastewater flows between the wastewater inlet and the wastewater outlet.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: November 21, 2006
    Assignee: CH2M Hill, Inc.
    Inventors: Kelly O'Connor, Laurens van der Tak, Albert M. Wollmann