Patent ID: 8096147

Claim:
A method to fabricate a shaped glass structure, comprising: preparing a photosensitive glass substrate having a composition comprising: less than 76 weight % silica, at least 0.15 weight % Ag 2 O, at least 0.75 weight % B 2 O 3 , at least 11 weight % Li 2 O, and at least 0.0014 weight % CeO 2 ; exposing at least one portion of the photosensitive glass substrate with an activating energy source, such as ultraviolet light (300 to 320 nm) or a directed source of protons using an activation exposure of 0.1-15 J/cm 2 , while leaving at least a second portion of said glass substrate unexposed; heating the glass substrate for at least ten minutes at a temperature that is in a temperature range of 420-520° C., heating the glass substrate for at least ten minutes at a temperature that is in a temperature range of 520-620° C., and cooling the glass substrate thereby transforming at least part of the exposed glass substrate to a crystalline material; and etching the glass substrate in an HF-containing etchant solution, wherein an etch ratio of exposed portion to said unexposed portion is at least 40:1, to provide a shaped glass structure.