US PATENT SUBCLASS 251 / 315.04
.~.~.~ Ceramic (e.g., glass or fired clay)
Current as of:
June, 1999
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251 /
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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.