Abstract: A system for making black powder comprising a jet mill into which potassium nitrate, carbon and sulfur, plus any other desired additive, are inserted, the particles being mixed, pulverized and ground in a vortex of gaseous fluid while the vortex is moved through a curvilinear path in the mill, the smaller, lighter particles being centrifugally separated from the larger heavier particles and then exhausted from the mill, the mill being constructed to decelerate the particles during initial mixture and to thereafter accelerate them through the curvilinear path, the system also including a second jet mill into which are introduced the particles exhausted from the first mill plus an additional coating material, the entire mixture being caused to tumble and roll slowly in the second mill to effect improved smoothing and coating.

Abstract: A system for selectively deactivating a telephone bell on a telephone instrument whereby when a telephone number is called, an auxiliary system automatically cuts in to prevent ringing of the bell until a predetermined code is initiated by the calling station, at which time the telephone bell is actuated.

Abstract: Anti-Microbial Quaternary Ammonium Co-Polymers formed by the condensation of at least two di-functional tertiary amines and a molar quantity of 1,4-dihalo-2-butene that is equal to the molar sum of the di-functional tertiary amines in the mixture.

Abstract: The method of lubricating or softening the skin comprising the application of cosmetic preparations such as ointments, salves, creams, lotions, bar soaps, and the like, that contain a durable dry lubricant, comprising perfluorocarbon resins, said lubricant being inert to human and animal skin tissue, nonagglomerative, and sized to fit smoothly within the crease lines of human and animal skin tissue.

Abstract: Carriers for dyes for polyamide fibers of DuPont's Type 472 nylon Qiana wherein the carriers contain a mixture of (a) either para-tertiary butyl phenol or para-tertiary amyl phenol and (b) normal butyl benzoate, such mixture comprising a swelling agent.

Abstract: Microbiocidal quaternary ammonium polymers which are made by condensing a difunctional tertiary amine with an excess of 1,4-dihalo-2-butene, then after removing the unreacted 1,4-dihalo-2-butene, adding to the reaction product a calculated quantity of monofunctional tertiary amine for the purpose of forming a linear polymer whose termini at both ends are quaternary ammonium moieties.