(under subclass 509) Subject matter comprising a filter to partially absorb or reflect some or all of the light from the illuminating means and alter its energy spectrum.
SEE OR SEARCH THIS CLASS, SUBCLASS:
214, for a mask or screen for a light filament.
290+, for a louvered or grid-type modifier.
293, for a filter-type selected wavelength modifier.
SEE OR SEARCH CLASS
296, Land Vehicles: Bodies and Tops,
97.1+, for a glass screen or visor with specific structure or property for diffusing or reflecting light. 313, Electric Lamp and Discharge Devices,
112, for a polarizer or filter, and subclasses 113+ for a reflector-type optical device or a special ray transmissive envelope.
356, Optics: Measuring and Testing,
402+, for an optical system using shade or color.
359, Optics: Systems (Including Communication) and Elements,
601+, for a glare or unwanted light reduction means. [figure] [caption]A - Reflector; B - Light source; C - Filter to filter out visible light and transmit ultraviolet light; D - Arrow represents light passed from the light source through filter; E - Arrow represents light emitted by the light source without passing through the filter; F, G, H - Filter operating device in the form of draw magnet; J - Light source attachment; K - Spring to displace filter positions; L - Conductor through which current is delivered to draw magnet; M - Conductor through which current is delivered to light source
