Abstract: Aqueous pulp-and-paper mill waste streams are treated with a waste stream derived from the nitric acid etching of aluminum foil for electrolytic capacitors. This waste stream consists essentially of aqueous acidic aluminum nitrate, and a polyelectrolyte is added to it to synergistically improve flocculation, settling, and dosage rates.

Abstract: An integrated circuit employing a photo-diode activates an alarm when an intruder causes a change in the ambient light patterns by more than about 5% in an area under surveillance. The circuit includes a voltage regulator for supplying a back bias voltage to the photo-diode which voltage is substantially purged of noise that may be superimposed on the main d.c. supply voltage conductors. The regulator circuit includes a modified current-mirror type current source and a V.sub.BE -multiplier circuit providing a log-log noise transfer function.

Abstract: A ferrite toroid has two radially extending gaps. Into each gap there is inserted an insulative shim having a magnetic metal ribbon folded over the shim. When current is applied to a winding on the core, the resultant magnetic flux is steered into the magnetic ribbons and around the gaps. For high frequency excitations eddy current losses in the ribbons are high and the windings have low Q but high inductance. At high winding currents, the magnetic ribbons are saturated, the inductance is reduced and the Q of the winding increases. In a switching voltage regulator, this inductor tends to generate only a small amount of ringing and electromagnetic radiation noise.

Abstract: A smooth electroding ink containing a silver-alloy powder is prepared by milling and deagglomerating the silver-alloy powder in the same vehicle employed in the ink. This is accomplished at high production rates in a sand mill by establishing and maintaining during milling a splash-free laminar-flow vortex of the slurry, leading to very smooth buried silver-alloy electrode films in a monolithic ceramic capacitor.

Abstract: A monolithic ceramic capacitor has a ceramic body with two sets of mutually parallel interdigitated electrodes buried therein. The electrodes of one set extend to one end face of the body contacting a conductive terminal layer on the one end face. The electrodes of the other set extend to a side face of the body contacting a second terminal layer intermediate the two end faces. The opposite end face has a third terminal layer that does not contact any of the electrodes. A fuse link is connected external to the body between the second and third terminal layer.

Abstract: A non-aqueous electrolyte for an electrolytic capacitor contains as solute a salt obtained from an amine and a trialkyl phosphate.

Abstract: An array of porous oxide-filmed tantalum pads that are sintered to a tantalum foil, each have a composite MnO.sub.2 layer formed thereover by the steps of filling the pad pores with a manganous nitrate solution by capillarity from a sponge-like reservoir pressed gently against the pads, pyrolyzing, screen printing over the first MnO.sub.2 sublayer a thixotropic mixture of MnO.sub.2 powder and manganous nitrate and pyrolyzing, and again depositing from the sponge-like reservoir a quantity of manganous nitrate and pyrolyzing again. A counterelectrode is formed over the composite MnO.sub.2 layer at the top of each pad. A temporary masking layer is deposited over each of the counterelectrodes. The streets separating the pads, and the pads themselves are flooded with an insulative resin. Excess resin is removed with a squeegee and the resin is cured. The masking layer is removed and slots are gouged in the resin in the alternate of the columnar streets, which alternate streets are wider than the others.

Abstract: A reduced barium titanate ceramic capacitor in the form of a rod has closely-spaced electrodes connected in parallel or two spiraled electrodes on the surface thereof and a dielectric layer underneath each. By reducing both the distance between adjacent electrodes and the width of the electrodes, a capacitor with a low power factor is obtained.

Abstract: A cover-terminal assembly for an electrolytic capacitor is made by placing a gasketed terminal in a counterbored hole in a polyphenylene sulfide cover and upsetting the shank of the terminal by resistance heating under pressure. The portion of the hole adjacent the opposite end of the terminal is also counterbored and then filled in by molten cover material flowed during the hot upsetting operation.

Abstract: A resilient insulative layer of a plastic foam material is sandwiched between a dimpled carbon powder loaded plastic sheet and a resilient carbon powder loaded plastic foam pad. The dimples extend part way through holes provided therefor in the insulative layer. This sandwich assembly being placed under a bed mattress serves as a mattress-switch indicating electrically by contact between the sheet and the pad the presence of an occupant in the bed or his absence by lack of such contact. The characteristic time of the pad material for returning to its original shape is substantially longer than the corresponding return time of the insulative layer. Reliable operation is obtained for a wide range of occupant weights regardless of the weight(s) of the previous occupants.

Abstract: A monolithic ceramic capacitor has two lead wires each of which is doubly up-set to form two closely adjacent enlarged portions near one end thereof. The end-most enlarged portion of each wire is butt attached by solder to one of the two metallized terminations on the ceramic body. A conformal free-flowed protective resin coating covers the body and just a portion of the adjacent enlarged portion of each lead wire. The adjacent enlarged portion of each lead wire is spaced from 3/4 to 3 times the lead wire diameter from the end-most enlarged portion. This adjacent portion serves to stop wicking of the resin outwardly on the lead wire during its application in liquid form and serves as a mounting stand-off in radially leaded capacitor structures.

Abstract: A highly solderable tightly bonded termination is provided on the exterior cathode and/or anode surfaces of a solid electrolyte capacitor. A conductive resin is applied to a surface of the capacitor body to be terminated. Deposited on this wet surrface are solderable metal particles, such as copper, prior to heat curing the resin. Solderable anode and cathode terminations may be provided by this method.

Abstract: Correlated electrolytic capacitors having a standard diameter in which each capacitor has a constant foil length providing operation at a standard frequency with an equivalent series resistance not appreciably in excess of the lowest ESR for the standard frequency.

Abstract: A wound multi-capacitor filter for suppressing R.F. interference signals on power lines is formed by winding into a roll a floating sheet electrode that is sandwiched between two dielectric layers, a pair of spaced equal area sheet electrodes and another electrode being in contact with the outer surfaces of the sandwiching dielectric layers. The pair of electrodes are connected to two power lines that deliver energy to a device such as a motor, while the other electrode is connected to a grounded terminal. This filter provides either a reduction in AC leakage or an improvement in noise attenuation or both compared to a conventional delta-connected filter.

Abstract: A delay-line has two essentially identical distributed parameter delay-line sections that have series connected solenoidal coils and mutually parallel axes. The winding directions of the two coils are such that an external observer traveling along the series connected coils from one free coil-end to the other will observe a winding direction reversal in going from one section to the other. Thus a uniform unidirectional magnetic field having a component parallel to the section axes will produce induced voltages in the two coils that are of opposite polarity and no net induced voltage will appear between the free ends of the series connected coils.

Abstract: A dielectric oxide film is modified by the incorporation of a minor amount of carbonaceous material. The modified film is produced by anodizing an aluminum electrolytic capacitor anode in a conventional electrolyte containing a minor amount of an alpha- or ortho- hydroxy carboxylic acid or salt.

Abstract: Wound foil electrolytic capacitor sections are anodized after winding. After removal of the formation electrolyte, the sections are rinsed, dried, and impregnated with working electrolyte. The sections are assembled by usual means into capacitors.

Abstract: An electrolytic capacitor contains as a spacer-electrolyte a polymer-liquid electrolyte composite. The composite contains the electrolyte as internal liquid phase and is preferably made of cellulose triacetate. Such a composite has high electrical porosity and reduces the equivalent series resistance of the capacitor.

Abstract: A pulsing oscillator employs a capacitor that is charged through a diode from a current-source circuit and repeatedly discharges through a PNP and an NPN transistor when the capacitor voltage reaches a predetermined voltage. Another transistor is connected in shunt with a diode and capacitor, and is turned on only when the first mentioned transistors turn on so as to divert the frequency controlling current from the current source away from the capacitor during the time of discharge. The output pulse width remains constant for all values of control current and large control currents may be used without risking the "latching-on" by large control currents of the transistors intended to carry the discharge current from the capacitor.

Abstract: Current efficiency is increased in the anodization of aluminum foil for electrolytic capacitors by carrying out the anodization below 90.degree. C. in a non-aqueous ethylene glycol-ammonium pentaborate bath containing a small amount of an orthophosphate source, e.g., ammonium dihydrogen phosphate.