Abstract: Either after or during the process of forming aluminum foil for use in making electrolytic capacitors, the formed oxide foil is drawn through two separate electrolytes wherein two electrodes are immersed respectively. An AC voltage source is connected between the two electrodes. The resulting reactive current is a direct measure of the potential capacitance per unit foil area that can be obtained in capacitor manufacturing and is also an indirect measure of the oxide film thickness.

Abstract: An electrolytic capacitor which has a porous valve-metal anode pellet, a tri-metal housing, and a hermetic glass-metal seal, has a thin layer of a ductile and solderable metal on the inner surface of the housing adjacent the seal. This layer extends from the mouth of the housing to at most the bottom of the glass-metal seal which is sealed, preferably by soldering, to the housing.

Abstract: In the production of low voltage aluminum foil capacitor electrodes, etched and clean foil is subjected to a thermal treatment at about 595.degree. to 650.degree. C. and then anodized in an adipate formation electrolyte. The electrolyte may contain a minor amount of a phosphate salt, or the final reanodization may be carried out in a phosphate electrolyte.

Abstract: An electrolytic capacitor having a wound foil capacitor section, preferably aluminum foil, contains as electrolyte a solution of 3 to 10 wt % ammonium benzoate, 4 to 16 wt % water, and 75 to 93 wt % ethylene glycol which has a resistivity of 385 to 620 ohm-cm and provides a capacitor capable of operating above 100 V and above 85.degree. C. A nitro compound and a phosphate may also be present. The electrolyte is particularly suited for operation above 200 V and 95.degree. C. and higher.

Abstract: A full transistor bridge power inverter employs a single untapped DC power supply and no transformer, and includes four power bridge NPN transistors and a simple two NPN transistor commutating circuit. The two commutating transistors are driven from a source providing two square wave signals 180.degree. out of phase with each other. This inverter is capable of driving with a square wave voltage, inductive, resistive and capacitive loads.

Abstract: Monolithic ceramic capacitors exhibiting Q values of around 10,000 at 10 MHz have been made that sinter at 1100.degree. C. The buried electrodes are a 70 Ag/30 Pd alloy. The body has a high firing component and a low melting borate flux. The high firing component is a magnesium zinc titanate. The TCC of these capacitors is at least as low as 0.+-.60 ppm.

Abstract: An electrolytic capacitor containing an anodized porous tantalum pellet utilizes as electrolyte an azeotrope of hydrochloric acid and water, preferably containing about 20 wt % hydrochloric acid.

Abstract: A metal container for use as a cathode in a tantalum electrolytic capacitor is drawn from a metal composite which has a layer of tantalum bonded to a copper layer in turn bonded to a nickel layer. The tantalum layer forms the interior of the can and the nickel, the exterior. A layer of tantalum carbide is formed on the tantalum interior and is covered by a layer of finely-divided carbon.

Abstract: Two identical integrated circuit (IC) chips are mounted at a pole of a magnet. Each IC chip includes a Hall-element followed by an amplifier. A comparator is connected to the outputs of the IC chips to produce a voltage that is directly related to the difference between the magnetic field strengths at the two IC chips that may be due to a ferromagnetic article that is closer to one IC chip than the other.

Abstract: A group of monolithic ceramic capacitors are made by repeatedly passing a substrate under a falling curtain of a ceramic slurry, drying each layer and screen printing an electroding ink pattern on successive of the dried ceramic layers to provide a green cake containing buried electrode patterns. The cake is diced using a razor blade. It is then removed from the supporting substrate and flooded with liquid nitrogen. The chilled cake is then mechanically stressed to provide near perfectly separated green bodies along the cutting planes.

Abstract: A low capacitance solid electrolyte capacitor employs an anode assembly of a body portion which is a short piece of valve-metal wire to which is attached, preferably by welding, a riser portion which is of narrower cross-section wire than the body portion. The anode assembly is cleaned and processed into a capacitor in the same manner as prior art porous pellet capacitor sections.

Abstract: An electronic component is directly coated with the ultraviolet-light cured product of an epoxy acrylate and a cycloaliphatic methacrylate.

Abstract: Monolithic ceramic capacitors are made by repeatedly passing a substrate through a falling sheet of a green-ceramic slurry, heating the substrate to dry each slurry coating before the next, on at least one dried coating screen printing a matrix of electroding-ink-film pairs and on an adjacent dried coating screen printing a matrix of electroding-ink-film patches. Each of the patches are registered over one pair of the films to form an area of overlap with one film of the one pair that is greater than the area of overlap formed with the other film of the one pair. A relatively large change in the adjustment of this registration advantageously produces a small change in the overall capacitance of the finished capacitor as measured between each pair of buried film electrodes. The final steps in the method include dicing the green-ceramic cake into bodies of rectangular profile, firing the bodies to maturity and applying conductive terminals to the body ends for contacting the films of the pairs.

Abstract: A ceramic slurry or slip includes ceramic powder, an organic plasticizer and a resin binder combined in an aromatic hydrocarbon solvent and has a viscosity that is independent of shear rate. Monolithic ceramic capacitors having fewer pin holes are made by forming a falling sheet of this Newtonian slip, and repeatedly interrupting the falling curtain by passing a carrier through it to form layers of green ceramic. An electroding film is deposited on each green ceramic layer to form buried electrodes. The Newtonian slip is advantageously self leveling and contains relatively few pin holes that degrade capacitor performance.

Abstract: An aluminum electrolytic capacitor has a wound extended-foil section with the edges of one of the foils extending from one edge of the roll and the edges of the other from the other edge. These extended foils are deformed after the section is wound in such a way that they are stretched and a metallurgical bond is formed between adjacent edges. A low-inductance, low electrical series resistance (ESR) capacitor is obtained as a result. The deformation may be accomplished by frictional cutting using a diamond saw.

Abstract: The oxygen content of tantalum is reduced by intimately contacting the tantalum with an alkali metal halide, reacting them in a non-oxidizing atmosphere at a maximum temperature of 1200.degree. C. to form and expel the tantalum halide and alkali metal oxide formed by the reaction, and then raising the temperature to 1400.degree. C. for no longer than 10 min. to volatilize any excess alkali metal halide. The tantalum may be in the form of a powder or a porous sintered pellet, and an improved product for electrolytic capacitors, with lower leakage current, is obtained.

Abstract: An aluminum electrolytic capacitor capable of operation at 150 VDC or higher and 105.degree. C. contains as its electrolyte a diisopropylamine or a triethylamine mono salt of azelaic acid dissolved in a solvent mixture of ethylene glycol, ethylene glycol and N-methylpyrrolidinone, ethylene glycol N-methylpyrrolidinone and dimethylformamide, butyrolactone, or butyrolactone and N-methylpyrrolidinone, all containing small amounts of water.

Abstract: Pure silver and palladium powders are thoroughly mixed and dispersed by ball milling in a solution of a surfactant in a liquid vehicle. After drying and granulating, the resulting powder was heated to 500.degree. C., first to form an Ag/Pd alloy powder and then to cause palladium to precipitate from the interior of the alloy particles, to form a protective barrier of PdO on the alloy particle surfaces and to alter the alloy to 90Ag/10Pd. This powder, when used to make a buried electrode in a ceramic capacitor changes dimensions very little up to 500.degree. C. in the early stage of sintering the ceramic below which temperature the ceramic is weakest and most subject to cleaving.

Abstract: A silicon integrated oscillator circuit is connected with a capacitor and produces a highly precise and stable triangular output voltage. Both the charge current and the discharge current are proportional to one reference current. A switching circuit terminates the charge and discharge intervals when the capacitor voltage reaches a level that is equal to intermediate points on first and second resistive-voltage-divider circuits, respectively. This is accomplished by a differential-transistor-pair comparator having the base of one transistor connected to a high voltage one of the reference points and a third transistor, which is connected collector to emitter across the one transistor, having a base connected to a low voltage one of the reference points.

Abstract: A printed-circuit-mountable wet-electrolyte capacitor is housed in a cylindrical can. A disc-shaped plastic cover is fitted in the open end of the can and has a through-terminal sealed therein to which the capacitor anode is electrically connected. Another such terminal, or the can, may serve as the cathode terminal. A groove in the periphery of the cover has a rubber o-ring. The o-ring is compressed by rolling and beading the can inwardly to effect a can/cover seal. Elongate metal pieces are held positioned by cavities provided near the periphery of the cover. The cover is fitted into the can and the elongate pieces are welded to the inner lip of the can to stop outward movement of the cover and to serve as mounting means to a printed circuit board.