Abstract: A polyester resin is made by esterifying a reaction mixture comprising specific amounts of a diol, a triol, an a cyclic dicarboxylic acid, an unsaturated, aliphatic dicarboxylic acid such as maleic acid and a saturated, aliphatic dicarboxylic acid.The polyester resin is cross-linked with an aminoplast resin to produce a one-coat chemical coating which dispenses with the need to use a primer coat.Another embodiment of this invention includes the use of a highly aromatic, polyhydroxy, low molecular weight polymer in the polyester resin formulation.

Abstract: An exhaust gas-cooling water separation chamber, a gas collection chamber and gas acceleration and gas flow-shaping conduit means. The entrance of the separation chamber is connectable to water coolant and gas exhaust tubes from a marine engine. The separation chamber is fitted with a water deflector disposed below the gas exit from that chamber, while a gas dam is disposed in the water exit from that chamber, the entrance and water exit going below the deflector level. The gas collection chamber is connected to the gas exit and a gas acceleration chamber which tapers downstream is connected to the gas collection chamber.

Abstract: Highly cross-linked, infusible, poly(benzimidazoquinazolines) are made by heat polymerizing fusible condensation prepolymers and pre-copolymers which, in turn, are made by the melt condensation of bis-2(o-aminoaryl)imidazoles with (a) aryl esters of extended aromatic carboxylic acids having a carboxyl functionality greater then two or (b) a mixture of the latter acid esters and aryl esters of aromatic dicarboxylic acids, respectively. The prepolymers and pre-copolymers may be employed to form laminates, molded articles, etc., having high strength and high temperature characteristics.

Abstract: A noise rejecting electronic sphygmomanometer comprises a conventional cuff-type sphygmomanometer having an inflatable bladder and pressure monitoring manometer connected thereto. A first microphone, having a sound pickup directed inwardly to be toward a patient's arm when the cuff is installed thereabout, is provided for picking up Korotkoff sounds as the cuff is deflated and blood flow in a patient's arm resumes. To avoid spurious indications caused by background sounds, a second microphone, having a pickup directed to pickup background noises, is also provided within the cuff. The outputs of both microphones are fed into electronic discrimination circuitry.

Abstract: A water-reduced coating composition is made by admixing water with a concentrate comprising: (1) a water-reducible, low molecular weight ester compound; (2) a modified epoxy amine salt; (3) a highly functional cross-linking agent; and (4) a coupling solvent for coupling the epoxy amine salt to water. Preferably, a low boiling component is included in the coating composition to facilitate removal of the water therefrom during cure.

Abstract: A wheelchair mounted control system may be activated to enable propelling of the wheelchair at different predetermined speeds, to cause portions of the wheelchair to recline or be elevated, or to cause a signal to be generated to operate other apparatus such as a book page turner, a light switch or a television tuner, merely by positioning the neck or other skin-exposed body portion of a person in the wheelchair who is otherwise largely incapable of movement. Particular structure includes a periodic electric field source and a pair of field pickup elements adapted to be selectively contacted by the skin of a movable portion of the disabled person's body to cause, for example, activation of stepping switches and associated control relays whereby wheelchair drive motor speed is preselected and recline/elevation motor apparatus is activated for effecting the desired control of various adjustable portions of the wheelchair.

Abstract: A system and a method are provided for storing high frequency signals, for example microwave signals, for later reproduction with any desired degree of fidelity. The system and method involve determining a measure of the phase difference between an incoming high frequency signal and a converting signal. The measure of the phase difference consists of a plurality of signals which may change rapidly. The phase difference signals are converted to digital frequencies and may be stored or transmitted in that form. Later, the digital signals may be converted to analog signals (if necessary) and used to control the phase of a signal having the frequency of the converting signal. This process reconstructs the incoming high frequency signal.

Abstract: A shaped charge liner is made by forming a pair of hollow conical sub-liners, without any uncontrolled residual tangential shear stress (e.g. by a deep drawing method) so that they mate together to form a single conical liner. One sub-liner is inserted in the other and then one pair of subliner ends are locked together. Thereafter, the sub-liners are counter-rotated about their attachment point and locked together at their other pair of ends to retain the counter-rotation. This counter rotation generates opposite residual tangential shear stresses in the two sub-liners which may or may not be equal to each other.

Abstract: Water-soluble ester intermediates characterized by having 2 and 3 ester groups per molecule are made by condensing (a) a polyol having 2 to 3 hydroxyl groups per mol and a carbon/oxygen ratio between 5:3 and 7:3 with (b) a polycarboxylic acid having a carboxyl functionality of 2 to 3, using an equivalents ratio of polyol to polycarboxylic acid so that the ester intermediate has a hydroxyl functionality of about 3 and using a ratio of 1 mol of polyol per carboxyl group.The ester intermediates are combined in aqueous media with specific amounts of water-soluble aminoplast resin and the resulting combination is cured at elevated temperatures to produce cross-linked, water-insoluble coatings which are suitable as can and coil coatings.Small amounts of epoxy resin which is soluble in the ester intermediate may be used to provide coatings having improved adhesion, particularly under certain adverse conditions.

Abstract: A novel method of reclaiming cured polyurethane elastomers comprises milling particulate cured polyurethane elastomer under shear sufficient to increase the temperature of the elastomer for a time sufficient to form the elastomer into a cohesive mass and then continuing the milling at elevated temperature and pressure in the presence of a selected devulcanizing agent until a uniform, continuous, cohesive, partially devulcanized product is obtained. The novel product has properties which are improved over those of the cured starting material including improved heat resistance, abrasion resistance and tensile strength.

Abstract: A system and a method are provided for storing high frequency signals, for example microwave signals, for later reproduction with any desired degree of fidelity. The system and method involve determining a measure of the phase difference between an incoming high frequency signal and a converting signal. The measure of the phase difference consists of a plurality of signals which may change rapidly. The phase difference signals are converted to digital frequencies and may be stored or transmitted in that form. Later, the digital signals may be converted to analog signals (if necessary) and used to control the phase of a signal having the frequency of the converting signal. This process reconstructs the incoming high frequency signal.

Abstract: An oil well fluid depth or pressure sensing system for sensing pressures adjacent the bottom of the oil well and providing signals on the surface indicative of the pressure range in the well. The sensor comprises a pressure sensitive switch utilizing a nestable welded bellows. Information is transmitted to the surface through a single wire, with grounded shield return. A phase sensitive detector circuit is located at the surface for providing signals indicative of normal pressures, over pressures and under pressures, as well as any malfunction in the system.