Watch cover glass and process for the manufacture of such a glas

Details Watch cover glass and process for the manufacture of such a glas Watch cover glass and process for the manufacture of such a glas

1987-12-11

1989-07-18

Swisher, Nancy A.

Stock material or miscellaneous articles

Decorative article

428698, 428426, 427 38, C03C 1706, C03C 2704, C23C 1302, G04B 3902

Patent

active

048492990

ABSTRACT:
Sapphire watch cover glass or crystal.
The glass or crystal (18) comprises on a part of its upper face, a superficial layer (28) having an amorphous structure. This layer (28) makes it possible to increase the hardness of the glass or crystal in its exposed parts while reducing the risk of breakage of said glass or crystal.

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