(under subclass 22) Vessel in which heat is conducted through the closed vessel to the liquid undergoing evaporation. The vessel is heated otherwise than by direct communication with a primary source of heat, such as a furnace.
SEE OR SEARCH CLASS
122, Liquid Heaters and Vaporizers,
32+, for devices in which the fluid is indirectly heated by a separate fluid.
126, Stoves and Furnaces,
378, for an indirectly heated liquid containing vessel.
165, Heat Exchange, appropriate subclasses for a vessel having heat exchange means.
