Patents Assigned to Longworth Engineering Ltd.
  • Cleaning filter components
    Patent number: 7799144
    Abstract: A method of cleaning a filter component comprises subjecting the component to an atmosphere of superheated steam at a pressure of a least 0.5 bar in a vessel and subsequently decompressing the vessel to achieve a pressure reduction of at least 0.5 bar in at most 5 seconds. The method is particularly useful for the cleaning of filter components that have been used for the filtration of molten polymer (e.g. polyester) and which are at least partially blocked by solidified polymer.
    Type: Grant
    Filed: May 28, 2004
    Date of Patent: September 21, 2010
    Assignee: Longworth Engineering Ltd.
    Inventors: Peter John Norris, John Norris, Christopher Reid, James Peter Millington