US PATENT SUBCLASS 454 / 9
.~.~.~ Having air current responsive adjustment means (e.g., wind vane, etc.)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


454 /   HD   VENTILATION

1  DF  CHIMNEY OR STACK {6}
3  DF  .~ Chimneytop or stacktop structure (e.g., cowl) {12}
8  DF  .~.~ Inlet and outlet {1}
9.~.~.~ Having air current responsive adjustment means (e.g., wind vane, etc.)

DEFINITION

Classification: 454/9

Having air current responsive adjustment means (e.g., wind vane, etc.):

(under subclass 8) Subject matter comprising a means which alters a position or operation of the structure in reaction to a change in (1) flow of natural air (i.e., wind) or (2) flow of air or products of combustion through the vertical conduit section.

SEE OR SEARCH THIS CLASS, SUBCLASS:

11, for an air current responsive adjustment means associated with chimney or stacktop structure which includes an inlet only (no claimed outlet) to a ventilated space.

17, for an air current responsive adjustment means associated with chimney or stacktop structure which includes a rotary means in the air current (e.g., fan etc.).

20, for an air current responsive adjustment means associated with chimney or stacktop structure which includes an outlet only (no claimed inlet) to a ventilated space.