A substantially transparent one-piece glazing panel is provided for generally horizontal mounting in a skylight. The panel is comprised of an repeated pattern of two alternating and contiguous linear optical elements; a first optical element being an upstanding generally right-triangular linear prism,...http://www.google.ca/patents/US4411493?utm_source=gb-gplus-sharePatent US4411493 - Seasonal control skylight glazing panel with passive solar energy switching
