This disclosure relates to a heat engine which operates generally on the basis of the Carnot cycle and includes a rotor mounted within a chamber and sealed relative to the chamber by means of a plurality of radiating vanes. Gas compressed in the mechanical compression cycle of the engine is by-passed to the part of the invention wherein isothermal expansion normally occurs in the Carnot cycle, and these compressed gases are heated to supply greater energy thereto to produce a greater energy work...

High temperature resistant, flame resistant polyisocyanurate polymers with superior characteristics of friability are disclosed. These polymers are obtained by first preparing an isocyanate-terminated prepolymer consisting of 1 percent to 10 percent by weight of an aliphatic diol and 99 to 90 percent by weight of a polymethylene polyphenyl isocyanate (consisting of 35 to 85 percent by weight of methylenebis(phenyl isocyanate). The prepolymer is polymerized in the presence of a tertiary amine and...

A low level d.c. error detector circuit wherein a semiconductor asymmetrically conducting device, such as a transistor connected as a diode, is serially connected with the low impedance signal source to be detected and the base-emitter path of the detecting transistor. The transistor-diode and the detecting transistor have the same semiconductor ratings and are poled with their forward conductivity paths connected in opposition so that the substantially equal voltages across their junctions canc...

A linear amplifier in an automatic gain control circuit whose gain is a function of the ratio of two bias currents is obtained by selectively coupling two pairs of semiconductor devices such that the effects of nonlinearities due to the logarithmic relationship between voltage and current across a PN junction cancel. The relationship between the two pairs of devices is such that the output signal from the second pair of devices is linearly related to the input signal driving the first pair of de...

The seat ring is formed with a bellmouth inlet while the innervalve can be tapered, flat or curved. The bellmouth shaped inlet allows a high flow rate to be obtained with energy losses and noise reduced to a minimum. The inlet can be slightly modified to change the valve characteristic without effecting efficiency to any significant degree.

Dry creme frosting mix having a density of about 0.55 to 0.75 gm./cc and a lower level of sweetness than presently available frostings.

Production of a low-soda alumina by calcining an alumina starting material of low-soda content at 1,100.degree.-1,400.degree. C followed by leaching. The starting alumina material contains less than 0.25 percent by weight soda, and the final alumina contains less than 0.1 percent by weight soda. The calcining is continued until the product is at least 75 percent by weight alpha alumina. Reduction in amount of soda from the alumina starting material to the final alumina product is at least 75 per...

A low voltage spark plug wherein the sparking end of the center electrode positioned within the spark plug insulator is provided with a cylindrical bore, a conically-shaped electrode electrically connected to the shell at one end and positioned within the bore with its axis substantially coincident with that of the bore and with the point of the cone positioned within the bore.

A phase sensitive detector employing a pair of limiting amplifiers, wherein he outputs are respectively connected to a current switch and a pair of in-line-decision switches. The in-line-decision switches and the current switch provide a current on one of two lines that is indicative of a phase difference between two periodic waveforms as they appear on the input of the limiting amplifier. The switching properties are controlled as a function of each waveforms' zero-cross-over point in time. Thi...

This invention relates to the purification of aqueous solutions of hydrazine and lower alkyl hydrazines to remove impurities. More particularly, it relates to the removal of sodium and other cations, chloride, carbonate and other anions from aqueous solutions of such hydrazines. The product solutions have, at most, extremely low limits of ionic impurities.