Glass manufacturing – Processes – Devitrifying glass or vitrifying crystalline glass
Reexamination Certificate
2005-09-06
2005-09-06
Griffin, Steven P. (Department: 1731)
Glass manufacturing
Processes
Devitrifying glass or vitrifying crystalline glass
C508S383000
Reexamination Certificate
active
06938441
ABSTRACT:
A method of heat treatment of glass materials and natural materials specifically of volcanic origin according to which the treated material is exposed to microwave radiation at a frequency range from 1 MHz to 10 GHz and temperature range from the ambient temperature to 1800° C. in a batch or continuous process. The glass or natural material subjected to a melting and/or refining process contains an inert additive elected from the group comprising carbides, nitrides or borides in an amount from 1 to 100 g preferably 5 to 50 g per 1 kg of the glass or natural material. The apparatus consists substantially of a microwave furnace comprising an outer shell (8.2) provided with a cover (10) and an inner shell (8.1) and at least one micro wave generator (1.1, 1.2, 1.3, 1.4) with double emission and total power from 0.1 to 1 kW per 1 kg of the treated material.
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Draho{hacek over (s)} Ji{hacek over (r)}i
Hájek Milan
Volf Václay
Vozáb Jaroslav
Collard & Roe P.C.
Griffin Steven P.
Herring Lisa L.
Ustav Chemických Proces{dot over (u)} Akademie V{hacek over
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