(under subclass 302) Brooders so constructed that the temperature is maintained in the brood chamber by (1) conserving warmth from a previous heating or (2) by utilizing the heat resulting from organic fermentation or any other heating process not due to the combustion of fuel.
(1) Note. If the patent provides no specific manner of heating, or only insulating material combined with a canopy or hover, it should be placed in subclass 302.
SEE OR SEARCH THIS CLASS, SUBCLASS:
437+, for housing structure lacking a hover, hover chamber, or canopy structure.
SEE OR SEARCH CLASS
106, Compositions: Coating or Plastic,
601+, 605, 672+, and 122 for heat insulating plastic or coating compositions. 126, Stoves and Furnaces,
273.5, and 375 for casings showing heat insulation.
217, Wooden Receptacles, for casings showing heat insulation.
220, Receptacles,
560.12+, 592.01+, and 903, for casings showing heat insulation.
252, Compositions,
62, for other heat insulating compositions.
428, Stock Material or Miscellaneous Articles, appropriate subclasses for a stock material product in the form of a single or plural layer web or sheet, and especially
304.4+, for a composite product in which at least one component is either porous or cellular (generally useful for insulation); and cross-reference art collection 920 for a similar product having heat insulating features.
