Patents by Inventor David A. Landriault

David A. Landriault 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).

  • Paste production and storage process
    Patent number: 5806977
    Abstract: The apparatus provides a unique and novel vessel and process that concentrate solids, produces paste and stores paste from mixtures of solids and liquids. The vessel or tank includes a vertical shaft mounted within the tank and a variable speed drive for rotating the shaft for circulating paste. The shaft includes a helical pump for lifting the paste and a rake arm extending outwardly from a lower portion of the shaft for moving the paste radially inward. A vertical flow director within the tank is connected to the shaft for maintaining paste flow and facilitating paste circulation at outer portions of the tank. A paste exit port through a lower portion of the tank is used for removing paste. The method forms a paste by first introducing a mixture of solids and liquids into a tank. A portion of the solids and liquids are lifted vertically to establish a circulation pattern within the tank.
    Type: Grant
    Filed: February 7, 1997
    Date of Patent: September 15, 1998
    Assignees: Inco Limited, GL&V Process Equipmet Group Inc./GL&V - Groupe Equipment de Procedes Inc.
    Inventors: Richard A. Farmery, Reichel A. Tenbergen, David A. Landriault
  • Paste production and storage apparatus
    Patent number: 5718510
    Abstract: The apparatus provides a unique and novel vessel and process that concentrate solids, produces paste and stores paste from mixtures of solids and liquids. The vessel or tank includes a vertical shaft mounted within the tank and a variable speed drive for rotating the shaft for circulating paste. The shaft includes a helical pump for lifting the paste and a rake arm extending outwardly from a lower portion of the shaft for moving the paste radially inward. A vertical flow director within the tank is connected to the shaft for maintaining paste flow and facilitating paste circulation at outer portions of the tank. A paste exit port through a lower portion of the tank is used for removing paste. The method forms a paste by first introducing a mixture of solids and liquids into a tank. A portion of the solids and liquids are lifted vertically to establish a circulation pattern within the tank.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: February 17, 1998
    Assignees: Inco Limited, GL&V Process Equipment Group Inc./GL&V--Groupe Equipement de Procedes Inc.
    Inventors: Richard A. Farmery, Reichel A. Tenbergen, David A. Landriault