US PATENT SUBCLASS 220 / 203.21
.~.~.~.~ Ball valve

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
202  DF  .~ With condition responsive vent or valve {1}
203.01  DF  .~.~ Responsive to pressure {10}
203.19  DF  .~.~.~ Specified valve structure provides a diverse function (e.g., leakage preventing, lock releasing) {3}
203.21.~.~.~.~ Ball valve

DEFINITION

Classification: 220/203.21

Ball valve:

(under subclass 203.19) Device wherein said valve structure includes a spherical element which moves to close a vent opening to provide the secondary function.