U.S. Patent #:  8, 307, 602, "Grate Sunshade": 

  https://www.google.com/patents/US8307602?dq=8,307,602&hl=en&sa=X&ei=4iySVaaFLoXUoAT325uQCQ&ved=0CB0Q6AEwAA

Key Words:  grate, solar grate, solar screen, energy savings, energy, energy efficiency, electricity savings, energy conservation, shade, sunshade sunshine, sunlight, light, infrared light, infrared heating, window attachment, AERC, grate sunshade, grate shade, stealth grate, indirect light, selective reflectivity, reflected light, absorbed light, diffused light, light blocking, shgc, window film, awning, shutters, fenestration, air conditioning, heat load, radiant heat, heat gain, visible light, room brightness, egg crate, diffuser, window, skylight, carbon footprint, CO2 emissions.