Patents by Inventor John Harold Purcell

John Harold Purcell 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).

  • Permanent magnet electrical machines
    Patent number: 4091300
    Abstract: A permanent magnet electrical machine includes a plurality of groups of permanent magnets which are magnetically coupled by a surrounding generally cylindrical housing of magnetic material. The magnets have flat, parallel, spaced pole faces and are arranged side by side with pole faces of the same polarity from the axis of the housing. An armature is rotatably mounted in the housing within the magnets.
    Type: Grant
    Filed: August 24, 1976
    Date of Patent: May 23, 1978
    Assignee: Lucas Industries Limited
    Inventors: Ronald Lynch, John Harold Purcell