Patents by Inventor David K. Nelsen

David K. Nelsen 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).

  • Delayed coking cycle time reduction
    Patent number: 5891310
    Abstract: The cycle time for a delayed coker unit is reduced by externally heating the coke drum near the junction of the drum shell and the supporting skirt thereof prior to beginning the hot coker feed fill step. This reduces the thermal stresses at the area around the welds of the drum skirt.
    Type: Grant
    Filed: June 20, 1997
    Date of Patent: April 6, 1999
    Assignee: Conoco Inc.
    Inventor: David K. Nelsen
  • Reduction of metal stresses in delayed coking drums
    Patent number: 5804038
    Abstract: The metal stresses in a delayed coke drum are reduced by externally cooling the coke drum near the junction of the drum shell and the supporting skirt thereof during the quench step. This reduces the metal stresses at the area around the welds of the drum skirt.
    Type: Grant
    Filed: September 8, 1997
    Date of Patent: September 8, 1998
    Assignee: Conoco Inc.
    Inventor: David K. Nelsen