US PATENT SUBCLASS 65 / 33.7
.~.~ Alumino-silicate containing phase

Current as of: June, 1999
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65 /   HD   GLASS MANUFACTURING

17.1  DF  PROCESSES {32}
33.1  DF  .~ Devitrifying glass or vitrifying crystalline glass (e.g., starting with or forming crystalline glass, etc.) {6}
33.7.~.~ Alumino-silicate containing phase {1}
33.8  DF  .~.~.~> Containing at least 3 percent lithium or lithium oxide (e.g., spodumene, eucryptite, petalite, etc.)

DEFINITION

Classification: 65/33.7

Alumino-silicate containing phase:

(under subclass 33.1) Processes wherein an inorganic aluminum-silicon material is present in the composition of the glass during some phase of the vitrifying or devitrifying operation.