Stock material product in which at least a portion contains a substance which is normally nontransparent but which in this product has been made transparent
(1) Note. Exemplary of the disclosures in this collection are paper, impregnated with a material of such refractive index that the paper becomes transparent; ground glass* or glass fibers*, embedded in a material with a refractive index such that the composite mass is rendered transparent; and a metal foil or layer thin enough to see through.
(2) Note. Materials, as glass*, cellophane and the product sold under the trade mark "Lucite*" or "Plexiglas*" are normally transparent and would not be appropriate for this collection. If, however, any of the aforementioned (or other) normally transparent materials are disclosed in an opaque form with further treatment to restore transparency (e.g, the embedded ground glass of (1) Note above), placement of the disclosure in this subclass would be proper.
SEE OR SEARCH CLASS
359, Optics: Systems (Including Communication) and Elements,
580+, for optical elements having a metallic coating which produces interference effects.
427, Coating Processes,
161, for a coating process which increases the transparency of a material.