Patents by Inventor Frederick John Underwood

Frederick John Underwood 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).

  • Rotary piston vacuum pump with washing installation
    Patent number: 7819646
    Abstract: A pump having a rotor, a stator, a housing enclosing the rotor and the stator, the housing having an inlet for a fluid, and a port for receiving a fluid which acts on deposits on a surface of the rotor and on a surface of the stator positioned downstream from the inlet.
    Type: Grant
    Filed: October 6, 2003
    Date of Patent: October 26, 2010
    Assignee: Edwards Limited
    Inventors: Mark Christopher Hope, Clive Marcus Lloyd Tunna, Frederick John Underwood