Patents by Inventor Edward D. Duckworth

Edward D. Duckworth 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).

  • Scraped-surface heat exchanger
    Patent number: 4279295
    Abstract: A scraped-surface heat exchanger comprises a stator surrounding a rotor, the stator having annular projections extending inwardly towards the axis of rotation of the rotor. Scrapers on the rotor scrape both blanks of each projection as the rotor rotates. The two blanks of each projection could be planar, the planes being substantially perpendicular to the axis of rotation of the rotor. Instead, at least one of the flanks could be sloping with respect to the axis of rotation.
    Type: Grant
    Filed: June 26, 1980
    Date of Patent: July 21, 1981
    Assignee: A. Johnson and Company (London) Limited
    Inventor: Edward D. Duckworth