Patents by Inventor Dean K Lawrence

Dean K Lawrence 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).

  • Digester wash extraction by individual screen flow control
    Patent number: 7749354
    Abstract: A continuous digester comprises a wash zone having a plurality of individual wash screens disposed about an inner wall of the digester for the withdrawal of co-current downflow liquor from the wash zone. A conduit is connected in fluid communication between each of the wash screens and a collector for co-current downflow liquor withdrawn from the wash zone of the digester. A valve is interposed along the length of the conduit leading from each of the wash screens. The valve is operable between open and closed positions in response to a signal received from a temperature sensor associated with the conduit leading from each of the wash screens.
    Type: Grant
    Filed: June 4, 2009
    Date of Patent: July 6, 2010
    Assignee: International Paper Company
    Inventors: Dean K Lawrence, Wayne Hill, Stanislaus Leo Ludwig, David R Code
  • Digester wash extraction by individual screen flow control
    Patent number: 7658820
    Abstract: A continuous digester comprises a wash zone having a plurality of individual wash screens disposed about an inner wall of the digester for the withdrawal of co-current downflow liquor from the wash zone. A conduit is connected in fluid communication between each of the wash screens and a collector for co-current downflow liquor withdrawn from the wash zone of the digester. A valve is interposed along the length of the conduit leading from each of the wash screens. The valve is operable between open and closed positions in response to a signal received from a temperature sensor associated with the conduit leading from each of the wash screens.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: February 9, 2010
    Assignee: International Paper Company
    Inventors: Dean K Lawrence, Wayne G Hill, Stanislaus L Ludwig, David R Code