Patents by Inventor David John Tompkins

David John Tompkins 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).

  • Commutator and Method of Commutating Current in a Rotating Electrical Machine
    Publication number: 20080136288
    Abstract: A commutator for rotation with or by the shaft of a electrical machine has first and second electrically conductive commutator segments provided on a base for electrical engagement with brushes connected to windings. Isolated from and interspersed between the commutator segments are first and second freewheeling segments. A first diode is connected between the first commutator segment and the first freewheeling segment. A second diode is connected between the second commutator segment and the second freewheeling segment. The diodes allow current to flow in only one direction between the commutator and freewheeling segments to help suppress commutation sparking.
    Type: Application
    Filed: August 2, 2005
    Publication date: June 12, 2008
    Applicant: DOLPHIN ELECTRIC HOLDINGS INC.
    Inventors: Thomas Mahon Shaw, Tony Muldowney-Colston, Jonathan James Bremner, David John Tompkins, Suleiman Abu Sharkh