Patents by Inventor Derek Peter Hurst

Derek Peter Hurst 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).

  • Circular filament lamp
    Patent number: 6759805
    Abstract: A circular filament lamp comprises a filament supported within an envelope which comprises a tube formed as the major part of a circle. The ends of the tube terminate in pinch seals through which extend current carrying assemblies connected to the filament. The pinch seals overlap one another circumferentially of the lamp, and are offset from one another on either side of a plane containing the axis of the filament.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: July 6, 2004
    Assignee: General Electric Company
    Inventors: Francis Gerard de Cort, Derek Peter Hurst
  • Circular filament lamp
    Publication number: 20040056584
    Abstract: A circular filament lamp comprises a filament supported within an envelope which comprises a tube formed as the major part of a circle. The ends of the tube terminate in pinch seals through which extend current carrying assemblies connected to the filament. The pinch seals overlap one another circumferentially of the lamp, and are offset from one another on either side of a plane containing the axis of the filament.
    Type: Application
    Filed: March 15, 2001
    Publication date: March 25, 2004
    Inventors: Francis Gerard de Cort, Derek Peter Hurst
  • Incandescent lamp having a helical coil that comprises multiple sections of different pitches
    Patent number: 6469426
    Abstract: An incandescent lamp element comprises an envelope and a filament (10) supported therein by a plurality of spaced supports. The filament comprises a helical coil of wire with sections (20, 21) having at least two different pitches. The first sections (20) have a pitch which enables the filament to be operated at a required colour temperature, and the second sections have a pitch which enables the filament to be supported by the supports.
    Type: Grant
    Filed: April 6, 1999
    Date of Patent: October 22, 2002
    Assignee: General Electric Company
    Inventors: Derek Peter Hurst, Paul Anthony Grazier, Anthony John Perrin, Kantilal Dhanjibhai Mistry, Francis Gerald Decort