(under the class definition) Subject matter which includes a source of radiant energy and a phosphor material which luminesces or which quenches luminescence as a result of excitation of the material by the radiant energy.
(1) Note. Combinations involving luminophor irradiation and detection of the visible luminescence are placed here and cross-referenced to the appropriate, photocell subclass in Class 250, subclasses 200+.
SEE OR SEARCH CLASS
40, Card, Picture, or Sign Exhibiting,
542+, for indicia forming a display device including a fluorescent substance to cause illumination of the indicia.
348, Television,
805+, for cathode-ray tube plus a fluorescent screen.
356, Optics: Measuring and Testing, 213+, for the examination of light from a luminous source.
