Abstract: An endless belt for use in digital imaging systems is provided having edge to edge uniform flatness, and precise circumferential and edge to edge thickness. The layers comprising the belt may be tailored as desired for use in either image recording, image transfer or sheet transport operations. In one embodiment, the belt includes an elastomeric base layer, an elastomer-impregnated spun cord layer, a woven or non-woven fabric layer, and an elastomeric surface ply. The belt is preferably manufactured by building the layers on a workpiece and then curing the layers.

Abstract: Natural gas mixture containing suspended tarry particles and water as contaminants are purified by systems providing upward passage of such contaminated gas mixtures through interparticulate spaces in a vertically extending stable filter bed composed of hard lapilli-sized solid masses having internal vesicles connected to peripheral surfaces characterized by peripherally open glassy surfaced vesicles, said masses partially immersed in a volume of methyl alcohol.