Abstract: A roof window pane for automobiles possesses, on the face towards the passenger compartment, a grating-type pattern of a material which impedes the passage of radiation, especially a baking finish. The grating-type pattern consists of superimposed gratings and has a moire structure.

Abstract: A heat exchanger for exchanging heat between solid particles and a gas where the particles fall vertically through a column under gravitational forces and the gas flows upwardly in the column. The heat exchanger has at least one stage in the column including a stack of packing elements supported by a support having openings through which gas may flow at a velocity sufficient to form a loose fluidized bed of particles. A grill is positioned in the lower part of the column through which gas may flow to support a dense fluidized bed of particles.