US PATENT SUBCLASS 65 / 99.4
.~.~.~.~.~ Treating or removing impurities in molten metal or glass

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

17.1  DF  PROCESSES {32}
66  DF  .~ Forming product or preform from molten glass {7}
90  DF  .~.~ Sheet {7}
99.1  DF  .~.~.~ By or with pouring molten glass onto forming surface {2}
99.2  DF  .~.~.~.~ Utilizing molten metal forming surface {3}
99.4.~.~.~.~.~ Treating or removing impurities in molten metal or glass

DEFINITION

Classification: 65/99.4

Treating or removing impurities in molten metal or glass:

(under subclass 99.2) Processes in which the molten metal, or glass, or glass sheet are treated to remove, or prevent impurities, or modify glass sheet properties.

(1) Note. Includes reaction with additive removal, or prevention of gas bubbles, special atmosphere etc.