Patents by Inventor Derek P. Hurst

Derek P. 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).

  • Hydrogen getter and method of manufacture
    Patent number: 4827188
    Abstract: A hydrogen getter for use within the arc tube assembly of a gas discharge lamp e.g. a high pressure sodium discharge lamp, comprises a layer (11) of a getter material (eg Ti) sandwiched by diffusion bonding between layers (12, 13) of a hydrogen permeable material (eg Nb) there being an exposed region of getter material. Hydrogen getters in the form of disc-like washers are formed from the sandwiched layers by a stamping process.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: May 2, 1989
    Assignee: Thorn EMI plc
    Inventor: Derek P. Hurst
  • High pressure sodium discharge lamps with hydrogen getter
    Patent number: 4806828
    Abstract: An arc tube (13) for a high pressure sodium discharge lamp (10) contains a quantity of a getter materal which comprises an alloy of titanium and niobium metal. The alloy is in the form of a coiled wire (31) which is wound on a tungsten electrode shank (29). The wire may have a sheath of niobium metal.
    Type: Grant
    Filed: May 8, 1987
    Date of Patent: February 21, 1989
    Assignee: Thorn EMI plc
    Inventor: Derek P. Hurst