(under subclass 373) Devices in which the bottom or walls of the vessel are so constituted, configured, or disposed as to modify the heat conductivity, heating area or heat distribution of the vessel relative to an unconfined heating fluid or a primary source of heat. Included in this subclass are arrangements for the transmission or distribution of heat through an extended surface of a material heating plate or vessel, not necessarily a part of a liquid containing vessel, such as a hot plate or griddle.
SEE OR SEARCH THIS CLASS, SUBCLASS:
360, 366, 367, and 368, for vessels heated by a confined heating fluid.
SEE OR SEARCH CLASS
165, Heat Exchange, appropriate subclasses for a heat exchange device having a wall structure modified for heat transmission purposes.
