Stock material or miscellaneous articles – Composite – Of quartz or glass
Reexamination Certificate
2011-08-23
2011-08-23
Speer, Timothy (Department: 1784)
Stock material or miscellaneous articles
Composite
Of quartz or glass
C428S688000, C428S697000, C428S701000, C501S002000, C501S073000, C501S077000, C501S078000
Reexamination Certificate
active
08003217
ABSTRACT:
Disclosed herein is a ceramic comprising: at least two different metal oxides, the at least two different metal oxides comprising TiO2and La2O3or TiO2and BaO; less than 20% by weight SiO2; less than 20% by weight B2O3; and less than 40% by weight P2O5; the ceramic having a glass transition temperature, Tg, and a crystallization onset temperature, Tx, and the difference between Tgand Txis at least 5K. The ceramic may comprise additional metal oxides. Also disclosed herein is a method of making an article using the ceramic; typically, the ceramic is heated above the Tg, shaped, and then cooled.
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3M Innovative Properties Company
Gallo Elizabeth A.
Robinson Lauren
Speer Timothy
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