US PATENT SUBCLASS 251 / 315.03
.~.~ Of specific material

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.~.~ Of specific material {2}
315.04  DF  .~.~.~> Ceramic (e.g., glass or fired clay)
315.05  DF  .~.~.~> Nonmetallic

DEFINITION

Classification: 251/315.03

Of specific material:

(under subclass 315.01) Ball valve fabricated from a particular composition.

(1) Note. Mere recitation of a material without particular significance attributed to the valve would not be classified in this subclass.