Watch cover glass and process for the manufacture of such a glass
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United States of America Patent
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Jul 18, 1989
Grant Date -
N/A
app pub date -
Dec 11, 1987
filing date -
Jun 19, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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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