Patents Assigned to Patent-Truehand-Gesellschaft fuer elektrische Gluelampen mbH
  • Metal halide lamp with a starting aid
    Patent number: 6222320
    Abstract: In a metal halide lamp having a ceramic, tubular discharge vessel (1), there is fitted outside on the discharge vessel an electrically conducting starting aid (11) which provides an inhomogeneous electric field strength. It comprises a metal wire which extends transverse to the axis and from the frame (8) out to the outer wall of the discharge vessel. It ends there approximately at the level of an electrode (2).
    Type: Grant
    Filed: January 19, 2000
    Date of Patent: April 24, 2001
    Assignee: Patent Truehand-Gesellschaft fuer elektrische Gluelampen mbH
    Inventor: Klaus Stockwald
  • High-pressure discharge lamp with a cooled electrode
    Patent number: 6218780
    Abstract: Each electrode comprises a shaft (6) and a head (5), the shaft being sealed in a vacuum-tight fashion in each case in an end region (2, 22) of the discharge vessel. At least one electrode is cooled by virtue of the fact that its shaft contains a cooling tube system in which a coolant (11) circulates. Said cooling tube system is surrounded at a spacing by an additional enveloping tube (9, 16), the interspace (10, 20) between the enveloping tube and cooling tube system being fitted with a means of thermal insulation.
    Type: Grant
    Filed: June 24, 1998
    Date of Patent: April 17, 2001
    Assignee: Patent-Truehand-Gesellschaft fuer elektrische Gluelampen mbH
    Inventors: Dietmar Ehrlichmann, Dieter Franke
  • Electrode with a helical attachment
    Patent number: 6201349
    Abstract: An electrode for electrical lamps comprises a core pin with a pushed-on helical member. A boss (9) projecting beyond the diameter of the core pin (7) is laterally constructed on the core pin at a spacing from the tip, the helical member (8) being arranged with at least one turn behind the boss.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: March 13, 2001
    Assignee: Patent-Truehand-Gesellschaft fuer elektrische Gluelampen mbH
    Inventor: Johann Pfaffel
  • High pressure sodium lamp of low power
    Patent number: 6051927
    Abstract: The high-pressure sodium discharge lamp of low power described here is chcterized by a very high xenon cold filling pressure of at least 1 bar. The pressure ratio to the sodium operating pressures lies between 10 and 30. Luminous efficacies of approximately 100 lm/W and more can be obtained with a lamp power of 50 to 100 W.
    Type: Grant
    Filed: October 1, 1997
    Date of Patent: April 18, 2000
    Assignee: Patent-Truehand-Gesellschaft fuer elektrische Gluelampen mbH
    Inventors: Wolfram Graser, Dieter Schmidt