Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1986-08-07
1988-04-19
Kellogg, Arthur
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
65129, 65135, 65136, 65130, 65335, 65347, 501 70, C03B 5225, C03C 304
Patent
active
047389389
ABSTRACT:
Method and apparatus are provided for refining glassy material or the like by vacuum. The material is first melted and then introduced into a vacuum chamber, preferably into space above liquid held in the chamber. Other aspects involve a two-step melting process preparatory to the vacuum refining, in which the material is initially liquefied in one stage and dissolution of particles is substantially completed in a second stage. The molten material is preferably foamed immediately upon entry into the vacuum chamber.
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Kunkle Gerald E.
Schwenninger Ronald L.
Welton Wright M.
Kellogg Arthur
Millman Dennis G.
PPG Industries Inc.
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