US PATENT SUBCLASS 454 / 4
.~.~ Cap closure

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.~.~ Cap closure {1}
5  DF  .~.~.~> Pivoted {2}

DEFINITION

Classification: 454/4

Cap closure:

(under subclass 3) Subject matter comprising a cover which can be positioned over the opening in the vertical conduit's uppermost section to stop flow therethrough of air or products of combustion.

SEE OR SEARCH THIS CLASS, SUBCLASS:

94, for a railcar, bus, or trailer having an exterior cap closure for a vent.

275, for an inlet airway having a specific cover or shield for an exterior vent opening.

347+, for an outlet airway having an air pump and which may include a readily moveable cover.

355, for an outlet airway having an air pump and including a moveable access cover.

356, for an outlet airway having an air pump and including an exterior neck with an enlarged, weather resistant cover.

358+, for other outlet airways which may include a readily moveable cover. 368+, for other outlet airways with a specific cover or shield for an exterior vent opening.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

89+, for pipes and tubular conduits with closures and plugs.