GLASS PLATE TO BE TEMPERED
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United States of America Patent
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Issued Date -
Aug 28, 2014
app pub date -
Sep 20, 2012
filing date -
Sep 22, 2011
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Abandoned
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Abstract
To provide a glass plate to be tempered, which has a low thermal expansion coefficient at relatively low temperature, and which can have a sufficiently high surface compression stress by a conventional heat tempering process, even when it is thin. A glass plate to be tempered, which contains B2O3 in a range of from 12.5 to 35 mol % in its composition, the difference [X−Y] between the total content X of compounds selected from MgO, CaO, BaO, Na2O and K2O in the composition and the content Y of B2O3 in the composition being within a range of from −5 to 10 mol %, and which is to be tempered by heating and quenching.
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