(under subclass 706) Mattress having a confined gas in which at least a portion of an upper, user supporting surface of the container is made from a highly porous material, or contains apertures, that permit a substantial leakage of gas, for the purpose of cooling or warming the user, or preventing bedsores.
(1) Note. Excluded from this subclass are mattresses having a plurality of chambers which incidentally permit the loss of gas through their porous covers (e.g., low air loss beds) and which are primarily concerned with either easily changing, alternating, or maintaining the support characteristics of a part or the whole mattress.
SEE OR SEARCH THIS CLASS, SUBCLASS:
423, for devices under the class definition including heating or cooling with forced air.
713, for air mattresses having variably pressurized chambers that may incidentally leak gas through a porous cover.
726, for mattresses, other than air mattresses, that have means, such as a fan, to force ventilation.
