(under subclass 111) Subject matter wherein the light modifying means includes at least two triangular shaped refracting elements.
SEE OR SEARCH CLASS
353, Image Projectors,
81, for prism in an image projector light path.
359, Optics: Systems (Including Communication) and Elements,
625, for focusing or defocusing using noncurved surfaces (e.g., prismatic, etc.), subclass 640 for light-dividing, combining, or image-forming by prismatic-type refractor, and subclass 837 for a prism with refracting surface.
362, Illumination,
339, for light modifier with prismatic type refractor.
