Patents by Inventor David S. Flett

David S. Flett 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).

  • Separation process
    Patent number: 4956520
    Abstract: Separation of a crystallizable component, especially paraxylene, from solution by chilling to form a slurry of crystals and liquid, separating crystals of the component in a first separator while simultaneously washing the crystals with a wash liquid and then re-melting the crystals, re-chilling them, separating the crystals in a second separator and washing them with a second wash liquid.
    Type: Grant
    Filed: October 9, 1987
    Date of Patent: September 11, 1990
    Assignee: Imperial Chemical Industries PLC
    Inventors: David S. Flett, John E. Lloyd