US PATENT SUBCLASS 454 / 30
.~.~.~ Pivoted

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}
27  DF  .~.~ Having readily movable air current regulating means {3}
30.~.~.~ Pivoted {1}
31  DF  .~.~.~.~> Plural

DEFINITION

Classification: 454/30

Pivoted:

(under subclass 27) Subject matter wherein the shiftable means rotates about a fixed axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5, for pivoted chimney or stacktop cap closures.

363, for a pivoted damper panel in an outlet airway.