Patents by Inventor George Alan Limpkin

George Alan Limpkin 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).

  • Lamps, luminaires and lighting systems
    Patent number: 6994452
    Abstract: The invention relates to LED-based lamps, luminaires and lighting systems for buildings particularly, though not exclusively, for providing emergency light in the event of power failure. In particular it provides a light-emitting diode lamp comprising a support (26) and an array of light emitting diodes (58) on the support, an optical axis (72) passing through the middle of the array (58) and diodes increasing in number and increasing in inclination with distance from the optical axis (72). It also provides a luminaire (24) comprising a lamp as described above and a lens (30) having facets for generally un-deviated and un-reflected passage of light from off-axis diodes, and a building emergency lighting system comprising luminaires (24) as described above. In an alternative embodiment inclination of the light is through progressively increasing inclination of the facets.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: February 7, 2006
    Inventors: Simon Grant Rozenberg, Ian Shaun Lawry, George Alan Limpkin
  • Lamps, luminaries and lighting systems
    Publication number: 20040062055
    Abstract: The invention relates to LED-based lamps, luminaires and lighting systems for buildings particularly, though not exclusively; for providing emergency light in the event of power failure. In particular it provides a light-emitting diode lamp comprising a support (26) and an array of light emitting diodes (58) on the support, an optical axis (72) passing through the middle of the array (58) and diodes increasing in number and increasing in inclination with distance from the optical axis (72). It also provides a luminaire (24) comprising a lamp as described above and a lens (30) having facets for generally un-deviated and un-reflected passage of light from off-axis diodes, and a building emergency lighting system comprising luminaires (24) as described above. In an alternative embodiment inclination of the light is through progressively increasing inclination of the facets.
    Type: Application
    Filed: June 4, 2003
    Publication date: April 1, 2004
    Inventors: Simon Grant Rozenberg, Ian Shaun Lawry, George Alan Limpkin
  • Variable high frequency lamp controllers and systems
    Patent number: 6229270
    Abstract: A high frequency control circuit for a gaseous discharge lamp which includes a mechanically variable reactance device coupled in series with the lamp to control the current fed to the lamp. The mechanically variable reactance device is adjustable by a user to alter the intensity of the light emitted by the lamp.
    Type: Grant
    Filed: January 26, 2000
    Date of Patent: May 8, 2001
    Assignee: InDigitale Limited
    Inventors: John Peter Stephenson, George Alan Limpkin