Appeal No. 95-4615 Application No. 08/158,853 The subject matter on appeal is directed to a roof or lid for melting furnaces, which generally has a diameter of twenty six feet. See specification, page 1. Claims 1, 13 and 20 are representative of the subject matter on appeal and read as follows: 1. A furnace lid, comprising: a center panel; side panels surrounding the center panel, each side panel having an outer edge, an inner edge abutting the center panel and lateral edges each extending between their outer edge and their inner edge, and abutting a lateral edge of an adjacent side panel, said side panels being inclined upwardly from their outer edges toward their inner edges, forming with the center panel a lid having substantially a dome shape, the lateral edges and inner edges being formed with keyways accessible from a surface of the lid; and keys located in the keyways, wherein the center panel, keys and side panels are formed of castable refractory. 13. A segment of a furnace lid comprising: a substantially planar panel of precast refractory having an upper surface, a lower surface, lateral edges and an inner edge, wherein the lower surface has a portion inclined relative to the upper surface: a concave channel extending along each lateral edge, located below the outer planar surface of the panel; and a relatively thin passage or recess formed along the lateral edges between an outer surface of the panel and the channel, connecting the channel and said outer surface of the panel. 2Page: Previous 1 2 3 4 5 6 7 8 9 NextLast modified: November 3, 2007