| US 7,514,149 B2 | ||
| High-strength laminated sheet for optical applications | ||
| Peter L. Bocko, Painted Post, N.Y. (US); David Chen, Taipei (Taiwan); Glen B. Cook, Corning, N.Y. (US); Frank T. Coppola, Elmira, N.Y. (US); Victoria A. Edwards, Horseheads, N.Y. (US); Gunilla E. Gillberg, Painted Post, N.Y. (US); Josef C. Lapp, Corning, N.Y. (US); Randy L. Rhoads, Horseheads, N.Y. (US); David A. Tammaro, Painted Post, N.Y. (US); and Butchi R. Vaddi, Sayre, Pa. (US) | ||
| Assigned to Corning Incorporated, Corning, N.Y. (US) | ||
| Filed on Apr. 04, 2003, as Appl. No. 10/406,965. | ||
| Prior Publication US 2004/0197575 A1, Oct. 07, 2004 | ||
| Int. Cl. B32B 9/00 (2006.01) | ||
| U.S. Cl. 428—426 [428/428; 428/432; 428/702] | 20 Claims |
| 1. A laminated sheet, comprising:
a surface layer having an optical surface of fire-polished quality and a thickness less than about 1 mm; and
a core layer attached to the surface layer, the core layer having a higher elastic modulus than the surface layer to increase
an overall stiffness of the laminated sheet, wherein the core layer is separable from the surface layer, the core layer being
made of a foam material or an annealed glass;
wherein the surface layer is made of a material selected from the group consisting of glasses and glass-ceramics and the core
layer is more soluble than the surface layer in a selected solvent.
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