US PATENT SUBCLASS 454 / 6
.~.~.~.~ Plural, separately pivoted portions

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}
4  DF  .~.~ Cap closure {1}
5  DF  .~.~.~ Pivoted {2}
6.~.~.~.~ Plural, separately pivoted portions

DEFINITION

Classification: 454/6

Plural, separately pivoted portions:

(under subclass 5) Subject matter wherein the cover comprises at least two parts, each part rotating independently about the same or different fixed axes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

31, for plural pivoted air current regulating means in a chimney or stacktop structure.

351, and 352, for plural damper panels in an outlet airway