Patents by Inventor Derek Parkinson

Derek Parkinson 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).

  • Hammer mill
    Patent number: 4202503
    Abstract: A hammer mill comprising a housing and mounted within the housing a rotor and a breaker and screening assembly which cooperates with the rotor is constructed so that the breaker and screening assembly may be angularly displaced between an operative position adjacent the rotor and a servicing position at which access may be had to the breaker and screening assembly from outside the casing.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: May 13, 1980
    Assignee: Dresser Europe S.A.
    Inventors: Derek Parkinson, Jack Goose