Abstract: A sound absorbing muffler used to attenuate noise carried by the exhaust gases of an internal combustion engine includes a straight-through flow tube of constant diameter and cross-section. The muffler utilizes both reactive and dissipative components and includes two annular sound absorbing end chambers, an outer annular resonating chamber, and an inner sound absorbing means. The muffler's configuration produces effective noise attenuation, yet low backpressure.

Abstract: An improved lightweight, ablative coating that may be spray applied and cured without the development of appreciable shrinkage cracks. The ablative mixture consists essentially of phenolic microballoons, hollow glass spheres, glass fibers, ground cork, a flexibilized resin binder, and an activated colloidal clay.

Abstract: An automotive exhaust gas muffler comprises gas passage tubes supported in curved portions of two press-formed metal housing parts and communicate with recesses formed in the housing parts.

Abstract: A flat, box-like muffler formed of metal upper and lower housing sections and internal gas passage defining plates has drainage holes to allow liquid that collects on the top of the muffler or on the bottom of the lower section inside the housing to drain out of the muffler. A special sound attenuation structure comprising passages pressed in the plates and support channels in the housing sections is shown.

Abstract: There are disclosed manganese compounds of the formulaMn.sup.II LX.sub.2 (Q).sub.n (I)wherein L is a monodentate ligand of the formulaPR.sup.1 R.sup.2 R.sup.3 (II)whereinR.sup.1, R.sup.2, and R.sup.3 are identical or different and are substituted or unsubstituted alkyl, cycloalkyl, alkenyl, alkynyl, or aryl or hydrogen providing that no more than two of the R.sup.1, R.sup.2, and R.sup.3 groups are substituted or unsubstituted aryl groups and that at least one of R.sup.1, R.sup.2 and R.sup.3 is a substituted or unsubstituted alkyl, cycloalkyl, alkenyl, alkynyl, or aryl group,X is a species capable of existing as an anion, e.g., Cl, Br,Q is a solvento molecule capable of forming a chemical bond to the manganese, andn is 1, 2, or 3 solvent donor atoms.The manganese compounds are useful in the separation of a gas such as oxygen, hydrogen, sulfur dioxide, an alkene, and carbon monoxide from fluids containing these gases.

Abstract: There are disclosed manganese compounds of the formulaMn.sup.II LX.sub.2 (Q).sub.n (I)wherein L is a monodentate ligand of the formulaPR.sup.1 R.sup.2 R.sup.3 (II)wherein R.sup.1, R.sup.2, and R.sup.3 are identical or different and are substituted or unsubstituted alkyl, cycloalkyl, alkenyl, alkynyl, or aryl; or hydrogen providing that no more than two of the R.sup.1, R.sup.2, and R.sup.3 groups are substituted or unsubstituted aryl groups and that at least one of R.sup.1, R.sup.2, and R.sup.3 is a substituted or unsubstituted alkyl, cycloalkyl, alkenyl, alkynyl, or aryl group,X is a species capable of existing as an anion, e.g., Cl, Br,Q is a solvento molecule capable of forming a chemical bond to the manganese, andn is 1, 2, or 3 solvent donor atoms.The manganese compounds are useful in the separation of a gas such as oxygen, hydrogen, sulfur dioxide, an alkene, and carbon monoxide from fluids containing these gases.

Abstract: A sprayable, low density ablative composition consisting essentially of:A. 100 parts by weight of a mixture of 25-65% by weight of phenolic microballoons,0-20% by weight of glass microballoons,4-10% by weight of glass fibers,25-45% by weight of an epoxy-modified polyurethane resin,2-4% by weight of a bentonite dispersing aid and1-2% by weight of an alcohol activator for the bentonite;B. 1-10 parts by weight of an aromatic amine curing agent; andC. 200-400 parts by weight of a solvent.

Abstract: 1-isopropenyl-2-ferrocenoylcarborane. This compound may be employed as an celeration burning rate catalyst in order to promote the burning rates of propellant compositions such as solid composite propellant compositions.