US PATENT SUBCLASS 65 / 33.1
.~ Devitrifying glass or vitrifying crystalline glass (e.g., starting with or forming crystalline glass, etc.)

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

17.1  DF  PROCESSES {32}
33.1.~ Devitrifying glass or vitrifying crystalline glass (e.g., starting with or forming crystalline glass, etc.) {6}
33.2  DF  .~.~> Electromagnetic radiation or resulting heat utilized (e.g., gamma rays, X-rays, atomic particles UV, visible, IR, actinic, laser, microwave or radio wave, etc.)
33.3  DF  .~.~> Halogen containing phase (e.g., crystalline or noncrystalline, etc.)
33.4  DF  .~.~> With coating
33.5  DF  .~.~> With fusion bonding glass to a formed part (e.g., devitrified seals, glass to metal, etc.) {1}
33.7  DF  .~.~> Alumino-silicate containing phase {1}
33.9  DF  .~.~> Forming product or preform from molten glass

DEFINITION

Classification: 65/33.1

Devitrifying glass or vitrifying crystalline glass (e.g., starting with or forming crystalline glass, etc.):

(under subclass 17.1) Processes which include the step of converting glass (a) from a vitreous state to a crystalline state, or (b) from a crystalline state to a vitreous state.

(1) Note. The intent to vitrify or to devitrify must be stipulated for classification in this and indented subclasses.