US PATENT SUBCLASS 454 / 159
.~.~.~ Heating

Current as of: June, 1999
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454 /   HD   VENTILATION

69  DF  VEHICLE (E.G., AUTOMOBILE, ETC.) {15}
143  DF  .~ Having inlet airway {7}
156  DF  .~.~ With air treatment means {3}
159.~.~.~ Heating {2}
160  DF  .~.~.~.~> Having means for combining heated and unheated air
161  DF  .~.~.~.~> Having heat exchange core

DEFINITION

Classification: 454/159

Heating:

(under subclass 156) Subject matter comprising nonspecific means for warming the air.

(1) Note. See the class definition for what constitutes a nonspecific means for warming the air such as is appropriate for this class. Recitation of an "air conditioning unit" or a "heater" does not exclude a patent from this class.

SEE OR SEARCH CLASS

62, Refrigeration, appropriate subclasses for a means for ventilating a space in combination with specific cooling or refrigerating structure.

237, Heating Systems, appropriate subclasses for a means for ventilating a space in combination with specific heating structure.