Patents Assigned to Patent-Treuhand-Gesselschaft fuer elektrische Gluehlampen mbH
  • Patent number: 7481951
    Abstract: A luminescent powder (1) with luminescent particles (2) having an average luminescent-particle size (3) selected from the range of from 0.1 ?m inclusive to 5.0 ?m inclusive. The luminescent particles comprise primary particles (4) having an average primary-particle size (5) selected from the range of from 0.1 ?m inclusive to 1.0 ?m inclusive. The primary particles which, for example, consist of a cerium-doped yttrium-aluminum garnet (Y3Al5O12), are agglomerated to form the luminescent particles. A method for producing the luminescent powder has the following steps: a) preparing at least one precursor of the primary particles, b) producing the primary particles from the precursor of the primary particles, and c) forming the luminescent particles of the luminescent powder from the primary particles. The precursor for Y3Al5O12 is, for example, a powder mixture of hydroxides.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: January 27, 2009
    Assignees: Osram Opto Semiconductors GmbH, Patent-Treuhand-Gesselschaft für elektrische Glühlampen mbH
    Inventors: Frank Jermann, Markus Richter, Wolfgang Rossner, Martin Zachau
  • Patent number: 6239540
    Abstract: The present invention relates to a compact low-pressure discharge lamp comprising a discharge vessel (14) with electrodes and supply leads (30), and a base (12) assembled from a cap (16), housing (18) and mounting plate (24) with a ballast arrangement. The mounting plate (24) with the ballast arrangement is installed in the interior of the base housing (30) and has terminals (26) for the electric connection of the supply leads (30) to the mounting plate (24). In this case, the supply leads (30) are pressed against the electric terminals (26) of the mounting plate (24) by means of a spring element (28).
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: May 29, 2001
    Assignee: Patent-Treuhand-Gesselschaft fuer elektrische Gluehlampen mbH
    Inventor: Horst Wittmann