Patents by Inventor Tomas Jüestel

Tomas Jüestel 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).

  • Red-deficiency compensating phosphor light emitting device
    Patent number: 6680569
    Abstract: A light emitting device includes a light source that emits first light in response to an electrical signal, and a fluorescent layer positioned over the light source. The fluorescent layer includes a first fluorescent material which radiates second light and a second fluorescent material which radiates third light. In one embodiment, the second fluorescent material contains europium activated calcium sulfide. In another embodiment, the second fluorescent material contains europium activated nitrido-silicate. In some embodiments, the device includes a light propagation medium which transmits the first, second, and third light as composite output.
    Type: Grant
    Filed: February 25, 2002
    Date of Patent: January 20, 2004
    Assignee: Lumileds Lighting U.S. LLC
    Inventors: Regina B. Mueller-Mach, Gerd O. Mueller, Tomas Jüestel, Peter Schmidt