US PATENT SUBCLASS 251 / 315.04
.~.~.~ Ceramic (e.g., glass or fired clay)

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

304  DF  ROTARY VALVES {5}
315.01  DF  .~ Ball valve {7}
315.03  DF  .~.~ Of specific material {2}
315.04.~.~.~ Ceramic (e.g., glass or fired clay)

DEFINITION

Classification: 251/315.04

Ceramic (e.g., glass or fired clay):

(under subclass 315.03) Material which is hard, brittle, heat-and corrosion resistant, and shaped by firing a nonmetallic mineral at high temperatures.