Glass manufacturing – Processes – Devitrifying glass or vitrifying crystalline glass
Reexamination Certificate
2008-07-29
2010-02-23
Group, Karl E (Department: 1793)
Glass manufacturing
Processes
Devitrifying glass or vitrifying crystalline glass
C501S004000, C501S007000
Reexamination Certificate
active
07665330
ABSTRACT:
Glass-ceramics includes Li2O, Al2O3and SiO2, have an average crystal grain diameter of a predominant crystal phase of 90 nm or below and have crystal grain diameter distribution of 20 nm or below. The glass-ceramics can be manufactured by heat treating glass comprising Li2O, Al2O3and SiO2under a temperature within a range from 650° C. to 750° C. and then further heat treating the glass under a temperature within a range from 700° C. to 800° C. for 100-200 hours.
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Group Karl E
Ohara Inc.
Westerman Hattori Daniels & Adrian LLP
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