Patents by Inventor Anna-Maria Frey

Anna-Maria Frey 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).

  • Metal-halide discharge lamp for photooptical purposes
    Patent number: 5691601
    Abstract: A metal-halide discharge lamp for photooptical purposes has a small electe spacing of less than 15 mm, preferably 2-8 mm, to provide an essentially pin-point light source, and a fill which contains AlI.sub.3 in an amount between 0.1 and 4.5 mg/cm.sup.3. Other filling components may in particular be halides of mercury, indium, thallium or cesium; up to 2 mg/cm.sup.3 of AlBr may be added. The lamp is particularly adapted for combination with a, preferably parabolic, reflector.
    Type: Grant
    Filed: December 14, 1995
    Date of Patent: November 25, 1997
    Assignee: Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen mbH
    Inventors: Anna-Maria Frey, Jurgen Maier, Manfred Pilsak, Ralf Seedorf, Clemens Barthelmes, Thomas Dittrich