This class includes:
(A) Compositions which are:
(1) Explosive; explosive compositions for the purpose of this class are those containing both a fuel and sufficient oxygen or an oxidizer so that, upon initiation, they are capable of undergoing a chemical change at a relatively high rate of speed, or a speed approaching instantaneous, resulting in the production of usable force through chemical change in the composition to produce gaseous products and usually heat, and are used for blasting, firearms, jet propulsion of rockets, vehicles, etc., rapidly filling automotive passenger-restraining gas-bags, etc. See Glossary, below.
(2) "Thermite"; "Thermite-type" compositions for the purpose of this class include; (a) a consumable fuel component which is any of metal (alloy and intermetallic compounds), metal-metalloid compounds, metalloids, and hydrides of metals or metalloids; (b) and in combination therewith an oxidant component which is either a metal oxide, inorganic oxygen salts and organic metal salts capable of yielding a metal oxide on decomposition, which components, depending upon the manner reacted, produce quantities of heat and chemical by-products, either solid or fluid which by-products may be recoverable. These compositions, by way of examples, are employed to produce usable heat and light, chemical products and especially metals, in pyrotechnics and incendiary, match compositions and smokes and for explosive priming or as additives for explosive compositions.
Included within this definition are unreacted mixtures of metals with metalloids because, though they contain no oxidant, they nevertheless react similarly to "Thermites" to yield usable heat. Also included are thermite compositions which contain an additive designed to prolong heating effects, reduce the production of gas or other by-products or otherwise moderate the exothermic activity of the composition.
(3) Fuel specialized for jet-rocket engine and intended for reaction with an oxidant therein, excluding air, in order to provide thrust for motive power purposes.
(4) For use in neutralizing the poisonous gases of explosives.
(B) Methods of preparing or treating such compositions not otherwise provided for. The classification of processes is based upon particular components of the explosive or thermic composition.
Lines with other classes and within this class
Compositions are in this class when defined as charges or forms which, in addition to the composition, set out nominal structure or shape of the charge or component thereof, unless the structure and/or size is such that there is imparted to the charge or component the capacity to function, as an individual unit to produce or alter a particular explosive or thermic effect, for which structure or form see Class 102. However, plural components associated as layered charges are in Class 149 if no particular structure and/or size of any of the layers is set forth.
Jet and rocket engine fuels are classified in this class when (a) the fuel component includes an oxidant component in sufficient quantity to provide the major portion of oxygen necessary for its combustion, or (b) when the fuels are specialized for jet and rocket use only and are contemplated to be combined with an oxidant other than air, except that included herein are those fuels which are known to be, or are disclosed as being, hypergolic even with air as the oxidant.
Conventional fuels, including those disclosed as being capable of use in turbo, ram or pulse jet power plants and which include such additives as anti-corrosion substances or ignition promotors, are in Class 44.
Compositions claimed as fuels and disclosed as being capable of functioning either with air or with other oxidants are classified in Class 44; see below with respect to the "Search" references involving Classes 44 and 75.
The rules for determining Class placement of the Original Reference (OR) for claimed chemical compositions are set forth in the Class Definition of Class 252 in the section LINES WITH OTHER CLASSES AND WITHIN THIS CLASS, subsection COMPOSITION CLASS SUPERIORITY, which includes a hierarchical ORDER OF SUPERIORITY FOR COMPOSITION CLASSES.