US PATENT SUBCLASS 454 / 1
CHIMNEY OR STACK

Current as of: June, 1999
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454 /   HD   VENTILATION

1CHIMNEY OR STACK {6}
2  DF  .~> Vehicle
3  DF  .~> Chimneytop or stacktop structure (e.g., cowl) {12}
41  DF  .~> Having liquid drain
42  DF  .~> Having internal air current guide
43  DF  .~> Having flue heater
44  DF  .~> Having lining or sleeve {3}

DEFINITION

Classification: 454/1

CHIMNEY OR STACK:

(under the class definition) Subject matter relating to a generally vertical, projecting, conduit section having an uppermost portion which opens to a surrounding environment, whereby air or products of combustion can flow between a ventilated space and the surrounding environment.

(1) Note. This and indented subclasses provide a residual location for chimney or stack structure not properly classified in other classes.

(2) Note. A mere opening, for example in a roof, is not considered to be a vertical conduit section.

(3) Note. The vertical conduit section usually projects above a roof such as that of a building.

(4) Note. This subclass does not include attic ventilators nor ceiling outlets ducted directly through the roof since they lack a "substantially vertically extending conduit section."

SEE OR SEARCH CLASS

52, Static Structures (e.g., Buildings)

218, for building structure with a flue having a gaseous fluid-directing feature which is not located in the chimney stacktop structure or cowl, subclass 219 for a connection between a flue and building structure, subclasses 245+ for a static structure including a barrier (e.g., wall, etc.) which has its opposite faces both curvilinear and substantially parallel. 110, Furnaces,

184, for a metal smokestack combined with particular solid material combustion apparatus in a locomotive or portable boiler.

114, Ships,

187, for steamboat stacks or chimneys adapted for use on vessels and having particular ship structure.

126, Stoves and Furnaces,

285+, for chimney or stack dampers, per se, not incorporated in chimneytop or stacktop structure and subclasses 307+ for miscellaneous smoke flues combined with particular stove or furnace apparatus provided for the application of heat.

285, Pipe Joints or Couplings,

42+, for a pipe with a roof junction which includes flashing.