Abstract: Polypropylene glycol dielectric fluids are used to impregnate electrical capacitors and particularly metallized capacitors for improved performance.

Abstract: An improved power capacitor dielectric system utilizes the combination of electrode foils having a raised dimple pattern on their surfaces, and only polypropylene film as the dielectric, the polypropylene film having a texture pattern on one surface.

Abstract: A modified round roll capacitor has a metallized paper electrode capacitor wound as a roll on a thick walled core tube with the roll and core tube being simultaneously flattened, the flattened core tube serving as an integral rigid core structure for the roll. The core is less deformable than the roll to provide continuing resistance in a flattening process and to maintain tension and central integrity to the structure.

Abstract: An electrical capacitor is impregnated with a base impregnant of a non-halogenated aromatic liquid which absorbs gas in the range of 40.degree. to 100.degree. to which is added a material that is a greater gas absorber over the same temperature range.

Abstract: A process for impregnating capacitors with a gas absorbing impregnant is disclosed including the steps of purefying a phthalate ester by adsorptive filtration and adding 5 to 30% by volume of an alkene having from 10 to less than 20 carbon atoms and 0.1 to 10% by volume of an epoxy stabilizer to the phthalate ester prior to impregnating the capacitor.

Abstract: A capacitor protective system involves the use of three interrelated concepts within the capacitor including a pressure sensitive circuit interrupter, a fuse, and a predetermined separation of capacitor leads along an electrode foil.

Abstract: In a blown tube process of producing thermoplastic film or sheeting, the blown tube is collapsed by passing it through a trapezoidal frame assembly to change the circular cross section of the tube to a square cross section. The square cross section tube passing from the trapezoidal frame assembly is then passed through a predeterminedly controlled flattening transition section to a pair of nip rolls in a manner that the film arrives at the nip rolls with minimal stretching.

Abstract: An electrical capacitor is impregnated with a base impregnant of a non halogenated aromatic liquid which absorbs gas in the range of 40.degree. to 100.degree. C. to which is added a material that is a greater gas absorber over the same temperature range.

Abstract: Between about 0.01 and 10.0% by weight of an antioxidant, and between about 0.1 and 10% by weight of an epoxide are added to a liquid aromatic ester prior to refining or purification of the ester and prior to the use of the ester to impregnate a capacitor.

Abstract: The invention relates to an indicator and/or interrupter circuit for an electrical capacitor. On the build-up of internal pressure in the capacitor a switch is caused to operate to open a set of contacts which thereby energizes an indicating lamp to provide a visual indication of a failed or over-pressure condition in the capacitor. The opening of the switch may also cause an interruption of current flow through a holding coil and this current interruption causes a circuit interrupter to operate mechanically and thereby remove the capacitor from its circuit.

Abstract: In a biaxial blown tube synthetic resin film making apparatus, the extruder die, mandrel, the reheat ovens, and a hot air ring are caused to rotate and oscillate about a stalk moving coaxially therethrough to provide an improved flatter and more uniform film.

Abstract: This invention relates to a circuit interrupter for an electrical capacitor wherein internal pressure conditions cause a bulging of the capacitor cover and the bulging cover is utilized to break a plurality of electrical tab connectors.

Abstract: A cooling system for quenching extruded thermoplastic tubing which moves in a vertically upward direction from a die to a cooling mandrel comprises a seal means between the die and the mandrel and the introduction of cooling fluid such as water between the seal and the mandrel to flow upwardly as the tube passes along the mandrel. A water vapor atmosphere below the seal provides a controlled atmosphere leaking past the seal which condenses immediately upon passing the seal and coming into contact with the cooling fluid. This controlled atmosphere avoids air leakage past the seal and consequent imperfections in the thermoplastic material tube.

Abstract: In a blown tube process of producing thermoplastic film or sheeting, the blown tube is collapsed by passing it through a trapezoidal frame assembly to change the circular cross section of the tube to a square cross section. The square cross section tube passing from the trapezoidal frame assembly is then passed through a predeterminedly controlled flattening transition section to a pair of nip rolls in a manner that the film arrives at the nip rolls with minimal stretching.

Abstract: Disclosed is an insulative header assembly with electrical feed through terminals therein. The header includes at least one tapered opening therethrough. A depression or counterbore at the narrow end of the tapered opening forms a shoulder therewith. A metallic one-piece feedthrough terminal with a tapered portion is forced into the tapered opening tightly enough to form a seal therewith. Part of the tapered portion extends into the recess or depression. The metal in the depression is flared to overlap the shoulder and thus securely fix the terminal in place. There are splines in the depression, and the metal that is forced into the depression conforms to the shape of the splines and thus rotatably restrains the terminal in the header.

Abstract: A method of producing a hard roll capacitor includes winding on a core a capacitor roll using heat shrinkable synthetic resin strips some of which are metallized while maintaining tension on the strips above about 200 grams per inch of strip width per mil thickness. The roll is then subjected to temperature sufficient to shrink the strips on the roll after which the roll is placed in a casing and its ends are covered with a dielectric liquid. The process results in a capacitor with only a narrow margin section of the roll at the edges being wetted by the dielectric liquid.

Abstract: Disclosed is a porous anode electrolytic capacitor and casing therefor. The casing is made of nickel and has a contoured inner surface with a thin layer of silver plating thereon which follows the contour thereof. Adhered to the silver plating is a porous layer of particles of a platinum group metal which enhances the cathode surface area of the capacitor. Also disclosed is a timing capacitor including the casing. The capacitor is useful at temperatures up to 125.degree. C.

Abstract: A cooling system for quenching extruded thermoplastic tubing which moves in a vertically upward direction from a die to a cooling mandrel comprises a seal means between the die and the mandrel and the introduction of cooling fluid such as water between the seal and the mandrel to flow upwardly as the tube passes along the mandrel. A water vapor atmosphere below the seal provides a controlled atmosphere leaking past the seal which condenses immediately upon passing the seal and coming into contact with the cooling fluid. This controlled atmosphere avoids air leakage past the seal and consequent imperfections in the thermoplastic material tube.