(under subclass 6) Devices comprising combinations of a conventional type of industrial furnace and a boiler located so as to be heated by the waste heat of the furnace.
SEE OR SEARCH THIS CLASS, SUBCLASS:
20, 421 and 470, for analogous devices.
SEE OR SEARCH CLASS
432, Heating,
90+, for (1) a structure in which the waste heat of a nominal boiler heats a material heating chamber of the Class 432 type (2) a structure in which the waste heat of a specific furnace heats a closed water chamber or conduit or (3) for a residual combination of a liquid heater and a work heater of the Class 432 type in which the heated liquid is utilized in heating the work.
