(under subclass 2) Compositions or products which are composed of at least two particles differing in size, shape, structure or some physical characteristic, particularly the density, the above difference affecting the ultimate properties of the composition or product.
(1) Note. Patents in this subclass are generally directed to blending of ingredients having the mentioned differences in order to control the burning rate.
(2) Note. A recitation that a portion of a component is held back or passes a given screen mesh is not a recitation of particles of two or more sizes.
(3) Note. Search appropriate subclasses, for similar blends or mixtures wherein similar burning rate control results by varying the chemical properties of at least one ingredient.
