(under the class definition) Compositions intended, when its elements are brought into contact with each other and/or with a suitable irreversible outside agent, to set up such chemical reaction as to generate heat without light.
(1) Note. Processes for preparing such compositions by mixing ingredients are included herein.
(2) Note. Processes for producing heat by merely mixing the ingredients of such composition or by merely exposing the composition to an activating agent are included herein.
(3) Note. Compositions included herein are often packaged, transported, and handled in such a way that less than all of
the ingredients are in admixture before the start of the exothermic reaction; they are classified herein, however, as if all of the ingredients are contained in a single mixture.
SEE OR SEARCH THIS CLASS, SUBCLASS:
902, for a collection of patents which illustrate the combination of a fuel of this subclass with an article to be heated, e.g., a hair curler, a package of food, a laminating press, etc.
SEE OR SEARCH CLASS 75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,
252+, for a mass of loose metal particles.
126, Stoves and Furnaces,
263.01+, for a fuel composition in a container in which it is used, when the proximate function of the claimed device is merely the production of heat.
132, Toilet,
220, for a hair device having a heat generating composition.
149, Explosive and Thermic Compositions or Charges, for fuels combined with an oxidizer for nonair combustion to produce explosive force, propellant gases, and/or intense or glowing heat, whether or not accompanied by flames or sparks, especially
37+, and 108.2 for such compositions containing free metal. Where the composition claimed in a patent is similar to those of Class 149 but the disclosure leaves doubt as to whether classification in this class (44) or Class 149 is proper, the doubt is resolved as follows: (1) Where a significant amount of water is required for the exothermic reaction to take place, the patent is classified here (class 44, subclasses 250+). (2) Where the exothermic reaction takes place while in contact with a living thing, it is classified here. (3) Where neither of these conditions is disclosed, classification is in Class 149.
156, Adhesive Bonding and Miscellaneous Chemical Manufacture,
583.1+, for a device containing a fuel, for pressing against a tube or hose to adhere a patch thereto by, for example, vulcanization.
228, Metal Fusion Bonding,
198, for a process of that class in which a filler metal is supplied by an in situ chemical reaction. Such reaction is usually an exothermic, thermic-type reaction.
252, Compositions,
70, for, among others, a composition which gives off heat in a readily reversible chemical reaction, heat being applied to the composition to reverse the reaction, and subclass 188.1 for a composition comprised of chemically interactive ingredients, which does not produce a significant amount of usable heat in the reaction.
426, Food or Edible Material: Processes, Compositions, and Products,
113+, for a package of food combined with means to heat the food.
