Refractory lining for conical portion of a furnace and brick therefor

Claim 1

A REFRACTORY LINING OF UNIFORM THICKNESS FOR THE CONICAL PORTION OF A FURNACE COMPRISING: SUPERIMPOSED ANNULAR LAYERS OF REFRACTORY BRICK, THE LONGITUDINAL AXIS OF EACH BRICK PERPENDICULAR TO THE PLANE TANGENT TO THE CONICAL PORTION AT THE INERSECTION POINT OF THE AXIS WITH SAID CONICAL PORTION; THE TOP AND BOTTOM FACES OF EACH BRICK, REFERRING TO THE INSTALLED POSITION OF THE BRICK IN A CONICAL PORTION OF SUBSTANTIALLY VERTICAL AXIS, HAVING ALTERNATE RIBS AND RECESSES INTERLOCKING WITH THE RIBS AND RECESSES OF ADJACENT BRICKS ABOVE THE BELOW, THE SIDE FACES OF EACH BRICK SUBSTANTIALLY PLANAR; THE TOP FACE AT THE OUTER END OF EACH BRICK NARROWER IN WIDTH THAN THE BOTTOM FACE AT THE OUTER END, THE TOP AND BOTTOM FACES TAPERING SUBSTANTIALLY UNIFORMLY IN WIDTH TOWARD THE INNER BRICK END, WHEREBY THE SUBSTANTIALLY PLANAR SIDE FACES OF EACH BRICK ARE PARALLEL TO THE ADJACENT SIDE FACES OF LATERALLY ADJACENT BRICK;