Abstract: A unit for heating initially solid asphaltic material to provide asphaltic concrete in a condition suitable for application, including an inner enclosure defining a volume for containing the material to be heated, an outer enclosure surrounding and spaced from the inner enclosure to define a space beneath the inner enclosure and passages for heated air flow around the walls of the inner enclosure, a screw disposed in an open-top channel at the floor of the inner enclosure to move heated material, an opening in the inner enclosure floor in communication with a passage in the outer enclosure floor for delivery of heated asphaltic material moved by the screw to the unit exterior, heating chambers projecting upwardly from the floor of the inner enclosure above the heating sources to provide regions through which hot air rises from the sources, and flues extending transversely from the upper portions of the heating chamber to the end walls of the inner enclosure for conducting the heated air from the heating chamb

Abstract: A unit for heating initially solid asphaltic material to provide asphaltic concrete in a condition suitable for application. The unit is operated to heat initially cold material to a temperature between 275.degree. and 300.degree. F. and to maintain it at that temperature until it is used. A thermostatic control system produces heated air intermittently in accordance with a predetermined schedule, and the heated air is used to heat the asphaltic material.

Abstract: System and apparatus for concentrating and directing heat energy for use, by way of example, in home fireplaces. The apparatus includes at least one infrared absorber-emitter arranged so as to prevent flame from a burning log from entering into an interior space being heated, to direct smoke from the log into a chimney and to direct infrared radiation into the space being heated. The infrared absorber-emitter preferably is a high nickel-chromium-iron alloy.

Abstract: A unit for heating initially solid asphaltic material to provide asphaltic concrete in a condition suitable for application, including an inner enclosure defining a volume for containing the material to be heated, an outer enclosure surrounding and spaced from the inner enclosure to define a space beneath the inner enclosure and passages for air flow around the walls of the inner enclosure, infrared energy sources within the latter space for heating air, heating chambers projecting upwardly from the floor of the inner enclosure above the infrared sources to provide regions through which hot air rises from the sources, and flues extending transversely from the upper portions of the heating chamber to the side walls of the inner enclosure for conducting the heated air from the heating chambers to the aforementioned passages. Heat-shielding means are interposed between the infrared sources and adjacent portions of the inner enclosure to prevent local overheating of the material.

Abstract: A container for maintaining molten material at an elevated temperature below the decomposition temperature of the material is heated utilizing a relatively high temperature infrared source by interposing a heat absorbing means relatively spaced between the heat source and the container for absorbing the infrared radiation from the source and for transmitting secondary radiation at a substantially reduced temperature onto the container skin.