Patents by Inventor Joachim Dirks

Joachim Dirks 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).

  • Rare earth metal halide lamp including niobium
    Patent number: 5831388
    Abstract: A projection lamp includes a metal halide discharge lamp (1) with a lightansparent discharge vessel (2) in which two electrodes (3) stand opposite one another, which are joined with current leads (5) led to the outside, whereby the discharge vessel contains an ionizable filling including mercury, at least one noble gas, at least one halogen, one rare-earth metal (RE) as well as another metal, niobium, for the formation of metal halides. The addition of metallic niobium provides the lamp with good color reproduction and good arc stability.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: November 3, 1998
    Assignee: Patent-Truehand-Gesellschaftfuer Elektrische Gluelampen mbH
    Inventors: Andreas Genz, Joachim Dirks, Hans Werner Golling, Clemens Barthelmes
  • Metal-halide discharge lamp for photo-optical purposes
    Patent number: 5798612
    Abstract: A metal-halide discharge lamp for photo-optical purposes contains an ionisable fill, comprising mercury, at least one noble gas, at least one halogen, aluminum (Al) and indium (In) as well as gallium (Ga) in addition. By the addition of Ga, typically in the range between 0.02 mg/cm.sup.3 and 1 mg/cm.sup.3, a reduction in the starting voltage is attained, while maintaining an Ra>85 at color temperatures typically between 5000 K and 11000 K.
    Type: Grant
    Filed: March 17, 1997
    Date of Patent: August 25, 1998
    Inventor: Joachim Dirks