Patent ID: 8110277
Filing Date: 2012-02-07
Classification: C03B,C03C,Y10T

Abstract:
1. A method of making a fused silica plate comprising the steps of: providing a cylindrical fused silica blank having a length, a longitudinal axis, and an outer diameter; forming a slot in the fused silica blank which extends from the outer diameter to a location at or near a center of the fused silica blank and is substantially parallel to the longitudinal axis, the slot being defined by a concave surface located at or near the center of the fused silica blank, a first side surface extending between a first edge of the concave surface and the outer diameter of the fused silica blank, and a second side surface extending between a second edge of the concave surface and the outer diameter of the fused silica blank, at least one of the first and second side surfaces being connected to the concave surface by a chamfered surface, the chamfered surface being inclined inwardly from the concave surface toward a center of the concave surface, wherein a width of the slot measured at the outer diameter of the cylindrical fused silica blank is smaller than a width of the slot measured at an intersection between the chamfered surface and the concave surface; and rolling out the fused silica blank having the slot to form the fused silica plate.