Abstract: Thermoset polymers of styrene terminated tetrakis phenols may be prepared from resins which possess the generic formula ##STR1## in which R is selected from the group consisting of alkyl, cycloalkyl, alkaryl and substituted alkaryl radicals and X is independently selected from the group consisting of hydrogen and halogen atoms. These polymers will be utilized as a component in laminates on circuit boards which are employed in relatively complicated pieces of electronic equipment.

Abstract: A magneto-optical element comprises a magnetic garnet layer on a crystalline substrate. The garnet layer has a faceted structure, which provides high Faraday rotation and controlled coercivity. The faceted structure is preferably formed by depositing the layer onto a substrate whose lattice constant is sufficiently smaller than that of the layer. The resulting elements find application in light modulators, such as switches and displays, where they permit high resolution without having to be cut into an array of small cells.

Abstract: A surveillance marker is provided for utilization in antipilferage and anticounterfeiting systems. The marker includes a housing formed of barium ferrite impregnated plastic. Advantageously, the barium ferrite impregnated plastic housing provides a quasi-solenoidal dc magnetic bias field for activating one or more stacked ferromagnetic ribbons contained within the housing to produce an identifiable signal in response to an applied ac magnetic interrogation field.

Abstract: A pressure measuring system which includes a pressure sensitive capacitor and a reference capacitor, a source of external excitation connected to the sensing capacitor, the reference capacitor being connected to a feedback signal generating circuit and the output from said capacitors being summed by a summing junction to produce an error signal. A phase sensitive demodulator is connected to receive the error signal and input same to a feedback signal generating circuit to generate the feedback signal for the reference capacitor. The feedback signal generating circuit includes a computing circuit for generating a digital signal corresponding to the magnitude of said feedback signal required to null said sensing capacitor signal to thereby provide a measurement of pressure.

Abstract: An anti-lock braking system which incorporates a pressure modulator disposed between a master cylinder and one or more wheel cylinders of the vehicle. The pressure modulator includes an electrically operated pump for pumping fluid from the rear cylinders back to the master cylinder and a pressure responsive isolating valve for isolating the wheel cylinders from the master cylinder in response to operation of the pump. The system is particularly well suited for application to the rear wheels of the vehicle.

Abstract: Fibers or other bulk material to be conveyed into an air forming system are fed in a continuous stream at a uniform rate to the air forming system by conveying the material into an elongated weight pan, weighing the pan, dropping the material onto a conveyor, and adjusting the speed of the conveyor to compensate for variations in weight. After a target weight in the pan is achieved, material is no longer fed into the pan, but the pan is not dumped until the conveyor has moved at least a distance equal to the length of the pan. The conveyor is at least twice as long as the pan, so that two dumps of the pan can be accommodated on the belt at the same time, thereby permitting the speed of the belt to be adjusted to feed the material into the air forming system at a substantially constant rate.

Abstract: A proportioning control valve for a fluid pressure braking system for a tractor-trailer combination vehicle permits unproportioned communication of control pressure when the tractor is pulling a trailer but proportions communication of control pressure when the tractor is operated without a trailer to establish a proportonally lower pressure level at the outlet of the valve. The control valve, when operating in the proportioning mode, is also responsive to pressure in the brake reservoir. When pressure in the reservoir drops below a predetermined level, the control valve proportions at a rate which increases the pressure level at the outlet at a rate greater than the rate of increase of control pressure until the unproportioned pressure level is attained.

Abstract: The hydraulic brake booster (12) includes a resilient member (96) disposed between an input member (94, 194, 294) and a pair of valve members (98, 101; 112) which control fluid pressure flow from an accumulator (14). When the input member (94, 194, 294) is actuated by the vehicle operator, theresilient member (96) is compressed so that the input member (94, 194, 294) moves relative to the valve members (98, 101; 112) and thus provides for greater movement of the input member (94, 194, 294) than for the valve members (98, 101; 112). The booster (12) includes a hydraulic or mechanical lockout which, in the absence of fluid pressure from the accumulator (14), eliminates the movement of the input member (94, 194, 294) relative to the valve members (98, 101; 112) so that the relative movement eliminated is not added to the valve stroke during manual operation of the booster (12).

Abstract: A method of manufacturing an electrode (20) for a spark plug (32) wherein a platinum cup member or (54) cap is attached to a tip (12) that extends from an extruded inconel body (10). The inconel body (10) is sequentially extruded from a cylindrical blank to produce a tip (12) on a first end (12) and a cup shaped (16) opening that extends from a second end (14) toward the first end (12). A copper core (18) is inserted into the cup (16) and the cylindrical blank (10) thereafter extruded to a substantially final length for the resulting center wire (20). In order to assure a uniform thickness, a source of platinum (38) is roller into a thin strip and a (44) disc is punched therefrom. The disc (44) is formed into a cap member (54) which has the shape of a cup . The resulting cap member (54) and center wire (20) are placed in a fixture and the cap member (54) is moved toward the center wire (20) until the cap member surrounds the tip (12).

Abstract: A system for deploying an array of sonar projector transducers includes a housing in which a plurality of disk shaped projectors are stacked, a pair of small diameter cables are reeled from a powered drum for tethering the projectors, the cables being anchored to the bottom projector, a pair of electrical conductors are connected to the projectors, each conductor constituting a series of sections interconnecting electrical connectors fastened to opposite sides of each projector, a centering ring attached to the bottom projector including a series of pressure responsive latches which serve to secure the array in the housing and to release the array upon its reaching a desired depth. Where the drum is actuated the stack is lowered with each projector being successively suspended by its pair of conductor sections, and each of the conductor sections is given a predetermined twist such that when the array is again returned to the housing the conductor sections are caused to form predetermined loops.

Abstract: A gas gyroscope 11 is provided with an aspirator pump 71 in order to evacuate gas from the main chamber 19 of the gyroscope 11. The evacuation of gas reduces windage and other air friction encountered by the gyroscope's rotor 21 and thereby extends the rundown time of the gyroscope. The aspirator 71 may be energized by a dedicated compressed gas source such as a compressed gas chamber 91. Alternatively, the aspirator 71 may be provided with ram air or bleed perpellant gases.

Abstract: A target nucleotide sequence having a half-restriction site is determined in the nucleic acid of a biological sample. It is contacted with a reagent complex of:(i) a labeled probe polynucleotide containing a target binding region which is substantially complementary to the target nucleotide sequence and which contains a unique half-restriction site completely complementary to the half-restriction site of the target nucleotide sequence; and(ii) a second polynucleotide hybridized to the labeled probe polynucleotide in at least a portion of the target binding region, the portion including the unique half-restriction site of the target binding region;The second polynucleotide contains at least one mismatched or unpaired nucleotide opposite to the unique half-restriction site of the labeled probe polynucleotide, whereby a restriction enzyme specific for the unique restriction site will not cleave the reagent complex.

Abstract: Improved article drying compositions which effectively remove water from the surface of non-absorbent articles to be dried, are provided. The solvents used to formulate the additive modified compositions are azeotropic binary mixtures, comprised of isobutanol and trichlorotrifluoroethane; and n-butanol and trichlorotrifluoroethane. The non-volatile additive, dissolved in the binary systems comprises a phosphate ester free acid type. These additives characterized as complex phosphate ester-free acid surfactants of the ethylene oxide type, which are commercially available, are preferred.

Abstract: This invention is a process for purifying crude acetone obtained by cleavage of cumene hydroperoxide, said crude acetone containing aldehyde impurities and appreciable amounts of unreacted cumene, by fractionally distilling the acetone in a multiple plate distillation column, said process comprising: continuously feeding crude acetone; continuously feeding a dilute aqueous solution of an alkaline material at a point above the crude acetone feed point; and controlling the temperature profile of the column by adjusting the amount of liquid acetone removed in step (c) to maintain a preselected temperature on a plate in the region between the crude acetone feed point and the alkaline material feed point.

Abstract: A composition of material for use as a friction material for a brake lining wherein steel fiber is the only metallic ingredient and the holding matrix is formed by rubber particles and phenolic resin. The holding matrix being strengthened by a reaction of the resin with calcium hydroxide. When the steel fiber comprises from 25-48% by weight of the total mixture and the rubber particles and phenolic resin comprise 17-25% by weigh of the total mixture, a sufficient structural unity is produced for the resulting friction material to withstand dynamic loading experienced during a brake application.

Abstract: An optical device that stabilizes the power in a cw laser beam comprises a material whose absorption coefficient increases wth increasing incident intensity. The same device acts as an energy limiter and pulse shortener for a pulsed laser. In either case, the device can be located either within the laser cavity or outside it. In another embodiment, the device is placed into the cavity of a passively mode-locked laser to permit mode-locking with laser materials that have high gain-saturation energy. Materials suitable for use in the device include Cr-doped crystalline solids and organic solutions, such as laser dyes, saturable absorber dyes, etc.

Abstract: A device for measuring the rate of change of speed of a machine such as a turbine engine which includes a digital counter for counting a speed signal having a frequency proportional to engine speed for a predetermined period of time and decrementing said count for a second period of time with the counting periods being proportional to engine speed. The up and down counts are derived by dividing a fixed frequency clock signal by a number proportional to engine speed to generate a variable frequency signal which frequency is proportional to engine speed. The difference between the up and down counts generates a remainder signal which is compared to predetermined limits.

Abstract: A target adapted for use in a magnetomechanical transducer system is activated by an ac magnetic field and a variable dc bias field to produce a resonant frequency which corresponds to the effective strength of the dc bias field. The target includes an elongated ductile strip of magnetostrictive ferromagnetic material enclosed in a nonmagnetic container in a manner to allow the strip to vibrate freely. The strip has a magnetomechanical coupling factor, k greater than O, where K=zero.sqroot.(1-fr.sup.2 /fa.sup.2), fr and fa being the resonant and antiresonant frequencies, respectfully. The system is economical to construct and affords accurate and efficient measurement of pressure via displacements and angles of pressure sensitive devices at locations proximate to or remote from the signal source (target).

Abstract: A novel positive photoresist formulation is provided based on a 1:1 copolymer of maleimide and an aliphatic vinyl ether or ester in combination with a photoactive sensitizer capable of undergoing a change in aqueous alkaline solubility upon exposure to actinic radiation. The copolymers disclosed have structures of the following type: ##STR1## where R is an alkyl substituent of from 1 to 20 carbon atoms, benzyl, C.sub.1 to C.sub.10 aralkyl, C.sub.3 to C.sub.12 cycloalkyl or ##STR2## where R" has the structures assigned to R, and where R' is independently H, C.sub.1 to C.sub.10 alkyl, phenyl, benzyl or C.sub.1 to C.sub.10 aralkyl. The polymers are compounded with a photoactive sensitizer capable of undergoing a change in aqueous alkaline solubility upon exposure to actinic radiation such as with diazonaphthoquinone sulfonic acid esters and amides. The polymer and sensitizer compositions are dissolved together in a solvent useful for spin casting of thin films on substrates.

Abstract: An improved method is presented for the deposition of dielectric films in the fabrication of integrated circuits (ICs), wherein a solution of polymers derived from cyclosilazanes is employed to deposit dielectric films on semiconductor substrates by the spin-on technique. These spin-on films planarize (smooth out) underlying substrate topography and therefore are especially advantageous in multilevel metallization processes where they allow a highly uniform and continuous deposition of a subsequent layer of metallization resulting in improved yield and reliability of ICs.