US PATENT SUBCLASS 454 / 13
.~.~.~ Chimneytop structure extends within chimney

Current as of: June, 1999
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454 /   HD   VENTILATION

1  DF  CHIMNEY OR STACK {6}
3  DF  .~ Chimneytop or stacktop structure (e.g., cowl) {12}
12  DF  .~.~ With means for mounting on brick-type chimney {1}
13.~.~.~ Chimneytop structure extends within chimney {1}
14  DF  .~.~.~.~> Means for mounting to inner wall

DEFINITION

Classification: 454/13

Chimneytop structure extends within chimney:

(under subclass 12) Subject matter wherein a portion of the structure is located in an interior portion of the brick or ceramic conduit section.