US PATENT SUBCLASS 65 / 134.2
.~.~ Subatmospheric pressure or vacuum utilized

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

17.1  DF  PROCESSES {32}
134.1  DF  .~ Fining or homogenizing molten glass {13}
134.2.~.~ Subatmospheric pressure or vacuum utilized

DEFINITION

Classification: 65/134.2

Subatmospheric pressure or vacuum utilized:

(under subclass 134.1) Processes wherein vacuum or pressure below that of the atmosphere is used during any stage of the purifying or homogenizing operation.