Abstract: A ceramic base component packaging assembly with high thermal transfer rates. The packaging assembly includes a molded plastic cover that receives spring washers, ceramic pads, resistive elements or other electronic components, and a thermally conductive ceramic base. The spring washers press the electronic elements against the ceramic base ensuring good thermal transfer. The ceramic base is an effective thermal conductor and electrical isolator for the device.

Abstract: An electrically conductive polymer film composition includes a polymeric resin, an electrically conductive substance intimately mixed in sufficient quantity with the polymeric resin to render the polymeric resin electrically conductive, and particles, such as fibers or spheres of appropriate size, admixed with the polymer composition in sufficient quantity so that in the cured polymer film the particles protrude from the surface of the film and render the surface uneven on a micro scale. The cured polymer film composition of the invention is incorporated in potentiometers and similar electric and electronic devices as a thick film where a contact wiper rides substantially continuously in contact with the protruding fibers.

Abstract: An object such as a fuse is enclosed within a homogeneous block of microporous thermal insulation material by a method which includes forming first and second blocks of insulation material having a relatively low density, arranging the object between co-operating faces of the blocks, and compacting the blocks around the object so as to cause the blocks to merge and to form a homogeneous block of microporous thermal insulation material having a relatively high density. The first and second blocks may be incorporated into first and second housings respectively, one of the housings being provided with a protruding tab and the other of the housings being provided with a corresponding slot.

Abstract: A method of enclosing an object, such as an electronic component, within a homogeneous block of microporous thermal insulation material comprises charging a first predetermined amount of a loose microporous thermal insulation mixture into a die and compacting the insulation mixture into a block for supporting the object to be insulated. A recess may be formed in the compacted mixture for receiving the object. The object is then located on the compacted mixture and a second predetermined amount of loose microporous thermal insulation mixture is charged into the die. The loose insulation mixture is compacted against the block of already compacted insulation material which causes the two charges of insulation mixture to merge and to form a homogeneous block enclosing the object.

Abstract: This method of making an implanted resistor comprises the steps of implanting the resistor with ordinary techniques and deposition over the implanted resistor of a polysilicon layer having a set thickness and fully covering the resistor. Thus, the resulting resistor is unaffected by any subsequent thermal treatments and its value remains constant irrespective of any high potential metal layers or connections crossing it. The method affords in particular resistive values of the order of 1 kOhms/square.

Abstract: A high power density, low corona resistor comprises a dielectric thermally conductive substrate having upper and lower surfaces and having a resistance element mounted on the upper surface thereof. The resistance element comprises a thin film of electrically conductive material. A pair of electrical leads are electrically connected to the resistance element and extend upwardly therefrom. An electrically insulative material covers the resistance element to provide physical and structural protection to the resistance element and the pair of leads. An electrically conductive sheet is operatively secured to the lower surface of the substrate and is in intimate contact therewith so as to substantially fill any microscopic indentations in the lower surface of the substrate thereby substantially eliminating voids between the lower surface of the substrate and the conductive sheet.

Abstract: A surface-mount power resistor may be fabricated using a power resistor of conventional design as its core. A conventional resistor is reworked so as to flatten its leads from a point near their emergence from the generally tubular body of the resistor to the ends of the leads. The reworked resistor is then encapsulated from a point on the flattened portion of one lead to a corresponding point on the other lead, with the resulting mold being shaped as to have at least two opposing flat surfaces. The ribbon-shaped portions of the leads which exit from the molded body are then shaped as desired to afford the finished product. Similar surface-mount electrical components may be fabricated for any component with axial leads.

Abstract: A resistance heating coil is placed on a sieve like tray above a suction box, and a slip of ceramic fibers is placed in the suction box, so that a ceramic fiber layer builds up when suction is applied. Portions of the sieve like tray are closed in regions beneath the resistance heating coil by strips in such a manner that the impervious regions of the sieve like tray are narrower than the width dimensions of the heating coil so that the space inside the heating coil remains free of fiber material during the vacuum moulding operation. This allows the heater to be operated at a higher temperature without the risk of crystallization of the fibers.

Abstract: An aircraft engine which may, for example, be a turbine engine, is provided with an engine temperature thermocouple harness for monitoring the temperature of the aircraft engine. A protective isolation assembly allows for the use of two separate aircraft circuits coupled to receive temperature indicating signals from the thermocouple system. The protective assembly includes two resistors sealed in a metal housing to be connected at the branch point from the existing aircraft temperature monitoring system; and the housing for the protective assembly is electrically and mechanically connected in direct proximity to the thermocouple harness output terminal housing. A short circuit of the second engine temperature monitor circuit would have negligible effect on the existing temperature indicator circuitry in view of the presence of the isolation block assembly.

Abstract: A furnace having a body in which electrically resistive material is positioned between two electrodes so that heat can be generated by passing a current through the material. The resistive material is a mixture of carbonized plant material and a non-organic material that acts as a insulator at low temperatures and acts as a conductor or semi-conductor at high temperatures.

Abstract: Improved discontinuous and cermet film resistors and strain gauges are disclosed wherein the film is maintained in a constant humidity in the range of 15% to 45% thereby substantially increasing the stable life of the strain gauge.

Abstract: An improved discontinuous film resistor and strain gauge is disclosed wherein the discontinuous metal film is maintained in a constant humidity in the range of 15% to 45% thereby substantially increasing the life of the strain gauge.

Abstract: A resistor device of simple construction particularly adapted for use as a precision, low ohmic value resistor. The terminal leads are axially aligned and extend outwardly from a molded housing. The inner end of each lead is shaped into a flat surface to facilitate the welding thereto of a resistor element and to minimize twisting of the embedded end of the lead. A radially extending disc shaped portion on each lead is adjacent the flat portion and is embedded in the molded housing to prevent axial movement of the embedded end of the lead. The embedded flat and disc shaped portions serve to minimize forces from acting on the weld joints to break the welds. The resistance element is free standing wire shaped into a serpentine configuration and embedded in the molded housing.

Abstract: The present electrical resistor package has a naked electrical resistor element which is designed to provide quantitative resistance to electrical current flow, said element is initially encapsulated in a flexible coating, such as silicone wax, which absorbs stresses and is secondarily encapsulated around said flexible coating, in a cushion type moisture barrier coating, such as silicone rubber, to keep moisture away from said element and finally is encapsulated around said moisture barrier coating by a hard protective coating, such as epoxy, to protect the nak ed element from physical and environmental damage.

Abstract: An electrical resistor and method of making same comprising an elongated resistor element having end sections and a resistance material extending therebetween, and a connecting part which is pressed onto at least one end section of the resistor for being bonded with the resistor element, the connecting part comprising a terminal lug having a first end section extending along and contacting an end of the resistor element and a second terminal end, and a cap received over and securing together the first end section of the terminal lug and its contacted end of the resistor element.

Abstract: There is provided a means for measuring resistance for a resistance thermometer consisting of an insulating former as a carrier and a thin platinum layer as resistance material, the carrier for the platinum layer being made of a material having a greater thermal coefficient of expansion than platinum over the range between 0.degree. and 1000.degree. C.

Abstract: A sensor for detecting a rapid temperature rise comprises a thermistor chip electroded on opposing faces and having lead-in wires electrically connected to the faces. The thermistor chip is encapsulated between two ribbons of plastic film which, in turn, are encapsulated between two sheets of copper foil which, in turn, are encapsulated between two layers of plastic film.

Abstract: There is provided a resistance element comprising a cylindrical carrier body, a rectangular bore therein in the direction of the longitudinal axis, a ceramic plate within said bore and securely bound to a flat wall of said carrier body, a thin layer platinum-resistor path with a temperature dependent electrical resistance firmly adhering to the surface of the ceramic plate opposite to that bound to said carrier body, electrical lead wires connected to said resistor path, said lead wires being secured to at least one end of said carrier body by an electrically nonconducting sealing composition and said lead wires passing through said sealing composition to the outside.

Abstract: Improved forms of electric resistance elements or resistors may be made from semiconducting organic-refractory oxide fibers, as for example drawn alumina fibers which have been subjected to contact with a pyrolyzable organic substance at a temperature above about 400.degree. C. A few, or a large number of the semiconductive fibers, can be used in a group or bundle form to provide a desired resistance for a particular resistor. A preferred form of resistance element will cover the fibers in a quartz tube or other suitable encapsulating material to preclude moisture problems.

Abstract: A flexible electric heater element in the form of a band, comprising heating wires disposed in an electrically insulating base enveloped in a sealed sheathing, the current-carrying wires extending outside the sealed sheathing and disposed along at least one of the narrower sides of the heater element.

Abstract: A surface-mount power resistor may be fabricated using a power resistor of conventional design as its core. A conventional resistor is reworked so as to flatten its leads from a point near their emergence from the generally tubular body of the resistor to the ends of the leads. The reworked resistor is then encapsulated from a point of the flattened portion of one lead to a corresponding point on the other lead, with the resulting mold being shaped as to have at least two opposing flat surfaces. The ribbon-shaped portions of the leads which exit from the molded body are then shaped as desired to afford the finished product. Similar surface-mount electrical components may be fabricated for any component with axial leads.