US PATENT SUBCLASS 454 / 19
.~.~.~.~ Including additional blade set

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}
15  DF  .~.~ With rotary means in air current (e.g., fan, etc.) {3}
18  DF  .~.~.~ Cage-type blade set {1}
19.~.~.~.~ Including additional blade set

DEFINITION

Classification: 454/19

Including additional blade set:

(under subclass 18) Subject matter further comprising a different group of rotating member (blade) structures acting on or being acted upon by (1) flow of natural air (i.e., wind) or (2) flow of air or products of combustion through the vertical conduit.