Patents Assigned to Patent-Treuhand-Gesellschaft fur elektrische Gluhampen mbH
  • Fluorescent lamp with silicon dioxide coating
    Patent number: 4344016
    Abstract: An improved low pressure mercury vapor discharge lamp, particularly of the fluorescent type. The inner wall of the glass envelope is coated with a layer of SiO.sub.2 particles which, in turn, is coated with a phosphor layer. The SiO.sub.2 particles have a particle size of below about 100 nm. The SiO.sub.2 particle containing layer containing between 0.5 and 0.7 mg of SiO.sub.2 particles per square centimeter of glass envelope which is coated.
    Type: Grant
    Filed: February 25, 1980
    Date of Patent: August 10, 1982
    Assignee: Patent-Treuhand-Gesellschaft fur elektrische Gluhampen mbH
    Inventors: Roland Hoffmann, Ernst Panofski