US PATENT SUBCLASS 454 / 237
HAVING BOTH INLET AND OUTLET AIRWAYS

Current as of: June, 1999
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454 /   HD   VENTILATION

237HAVING BOTH INLET AND OUTLET AIRWAYS {6}
238  DF  .~> Pressure regulation
239  DF  .~> Including automatic control means
240  DF  .~> With wind-operated air pump
241  DF  .~> Including unitary inlet and outlet housing {4}
250  DF  .~> Natural ventilation including air passage through rooftop (i.e., no air pump)
251  DF  .~> With air pump means {2}

DEFINITION

Classification: 454/237

HAVING BOTH INLET AND OUTLET AIRWAYS:

(under the class definition) Subject matter comprising a means for admitting air to a (ventilated) space and a separate means for exhausting air from the space.

(1) Note. The air admitting and exhausting means must be separate and distinct from one another. A single means which admits air to the space under one condition and exhausts air from the space under another condition is not included in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8+, for a chimney or stack having both inlet and outlet airways.

103+, for railcars, buses, or trailers having both inlet and outlet airways.

141+, for other vehicles having both inlet and outlet airways.

254+, for a means which acts alternatively to admit air to or release air from a ventilated space.