Abstract: A method for forming a hermetic compression glass to metal seal which leaves the metal free of oxide. A temporary assembly of a metal header having a glass bead in an aperture therethrough and an electrical feedthrough conductor passing through the glass bead is heated in a dehydrated pure hydrogen environment to above the melting temperature of the glass bead, and then cooled to solidify the bead and cause the header to contract around the bead.

Abstract: A ceramic seal assembly for electrically insulating and hermetically securing a terminal to a housing through which the terminal extends. The housing contains a fluid at a high pressure and an electrical device to which the terminal is connected. An adapter is provided for hermetically securing the seal assembly to the housing. The adapter comprises a generally tubular member defining two end portions and a collar secured to one of the two end portions. The seal assembly and housing are hermetically secured to the tubular member at separate locations. The seal assembly contains at least one annular ceramic member and is oriented such that the high pressure fluid contained within the housing causes the annular ceramic member to be in compression and thereby maintain a seal between the terminal and the housing.

Abstract: A vacuum feedthrough includes a metal case having elongated, closely spaced, parallel sidewalls and short, conjoining endwalls with a plurality of leads extending through the case open interior; the leads being arranged in closely spaced, parallel, side-by-side relation to and equi-distant between the sidewalls. A hermetic glass seal is created in the case interior in bonded relation with the plural leads and the case walls.

Abstract: A method of bonding capacitor bushings (48) to tinned metal tank top covers (44) and tin plated terminal caps (42). A thick film ink is applied in two coats, the first coat (60) being high in binder and low in silver content and the second coat (62) being high in silver and low in binder, and fired. After burnishing, the bushing is soldered to the metal parts in a conventional manner.

Abstract: In the sealed feedthrough construction disclosed herein, a maximally compliant solder joint is provided between the low expansion ferrule of a glass insulted feedthrough connector and a bore in an enclosure bulkhead of a high expansion metal. The desired uniform radial thickness is established by providing a step on either the outer diameter of the ferrule or the inner diameter of the bore.

Abstract: A terminal pin seal for an hermetic terminal assembly including at least two laminations one of which has the inner surface adjacent the assembly structure with electrochemical properties resistant to attack from chemical ingredients within the assembly and another of which laminations has the outer surface adjacent to ambient with electrochemical properties different from that lamination facing the assembly housing to produce a greater resistance to chemical attack from ambient.

Abstract: An hermetically sealed terminal construction having a terminal pin assembly wherein inner and outer pin parts are interconnected by a fuse link surrounded by a protective capsule defining an expansion cavity, the terminal pin assemblies extending through and being hermetically sealed to sleeves forming part of the supporting base, including a dielectric sealing member which covers the protective capsules and contiguous portions of the adjoining pin parts, the sealing member being adapted to fracture upon rupture of the protective capsules caused by disintegration of the fuse links, thereby causing the adjoining pin parts and contiguous areas of the sealing member to separate from the remainder of the terminal, thereby cutting off the flow of current through the terminal.

Abstract: An electrical connector assembly for use with a nuclear power plant pressurizer heater includes an external metal shell having a base end and a connection end with a header located internally of the shell intermediate the two ends. Connector pins extend from end to end of the shell passing through apertures in the header. About the pins there is placed a high voltage insulator such as a ceramic material extending on either side of the header. The base end of the connector is filled with an insulative reinforcement material completely surrounding the pins. The connection end is filled with a granular thermally stable insulative material and closed by connection to a heater assembly. The base end of the connector may also include an external flexible covering of insulative material to further protect the pins and reinforcement material from hydroscopic contamination.

Abstract: A ceramic-metal lead assembly, of the type suitable for use in nerve or heart pacemakers, has a disk of high-purity ceramic with at least one lead extending therethrough, the disk being soldered vacuum-tight to a flange ring via a solder gap. The flange ring consists of a metal which is resistant to body electrolytes, and the coefficients of thermal expansion of the joined materials are matched to each other, but are not identical. For avoiding cracks in the ceramic disk in the region of the solder connection, the solder gap has a width such that the diffusion path of the metal of the flange ring into the solder connection cannot exceed a selected distance in the solder bridge which forms at the soldering temperature. A solder zone which is free of the metal of the flange ring, and thus has a dutility which is not degraded by the flange ring metal, is formed around the ceramic disk.

Abstract: A capacitive measuring system including a sensor for measuring the clearance between a movable part and a fixed casing facing the movable part, the sensor is secured in the casing and has an active face facing the movable part to constitute a capacitor whose charge is representative of the clearance. A triaxial cable connects the sensor to an amplifier. The triaxial cable has a central conductive core and two surrounding conductors insulated from one another and from the core. The sensor comprises a central body including a disk with a surface constituting the active face of the sensor made from a metal of the platinum group (VIII) or an alloy thereof. The central body is connected to the core of the triaxial cable. Two conductive shields surround the central body and are connected to respective conductors of the triaxial cable. An electrical shielding or insulation of ceramic or glass is between the central body and the conductive shields.

Abstract: A hermetic terminal assembly for a motor unit housing including a cup-shaped body, the bottom of which has a rim and at least one hole defining an annular sealing lip extending in the same direction therefrom through which hole an electrical connection pin extends in sealed relation thereto with the pin insulated by a protective insulating extension sleeve bonded to a sealing insulator, the extension sleeve being formed relative the sealing insulator member and lip extremity to contact the outer periphery of the lip to remove possible sealing insulator cracking to a position removed from the pin.

Abstract: A terminal for an implantable pulse generator for connecting an electrode lead to the generator includes a base section formed of partially stabilized zirconia (PSZ) mounted on the exterior of the pulse generator housing and a conductive terminal member coupled to the base section. The base section, terminal member and pulse generator housing are joined by a biocompatible brazing alloy which is composed, by weight, of about 13% to about 17% copper, about 13% to about 17% nickel, and the balance being titanium.

Abstract: An improved hermetic terminal pin for conducting electrical current including a stop flange and fuse-like and locking groove areas adjacent thereto and a method and apparatus for manufacturing the terminal pin including the steps of feeding a wire material of preselected composition from a storage area to a cutting area and then to a roll forming area, the apparatus including die means to accomplish the roll forming step.

Abstract: An hermetically sealed electrical feedthrough assembly including an elongated inner electrical conductor having first and second ends; a glass body hermetically sealed around one length portion of the inner conductor adjacent to the first end thereof; a metal adapter hermetically sealed around the glass body and adapted for mounting in a wall of a housing; a tubular outer electrical conductor enclosing and coaxial with another length portion of the inner electrical conductor, the outer electrical conductor being separated from the inner electrical conductor by an annular volume and having one end portion electrically connected to the metal adapter and an opposite end portion disposed adjacent to the second end of the inner electrical conductor; and electrical insulation filling the annular volume and electrically isolating the outer electrical conductor from the another length portion of the inner electrical conductor.

Abstract: A modified terminal pin and end closure structure for the housing of a hermetic terminal assembly and method of manufacturing the same, the structure including an apertured end closure with a peripheral wall surrounding the aperture and extending into the housing with the free end of the wall cooperatively overlapped in aperture sealing relation by a terminal pin carrying eyelet.

Abstract: An improved terminal pin and end closure structure for an hermetic terminal assembly and method of making the same, the structure including an apertured end closure with a peripheral wall surrounding the aperture to extend at preselected angle from the end closure, the aperture being covered by a sealed terminal pin carrying sealing member which is sealed to the extended peripheral wall.

Abstract: A metal housing is provided with lead in members by way of a compression seal using a glass that can be worked below about 480.degree. C. The housing and lead in members can be preplated in a low cost process to provide a suitable protective coating that is present under the glass after the seal is made. This obviates a post seal plating and therefore avoids the related problems. It also permits using aluminum as the housing material.

Abstract: A hermetic feedthrough consisting of a niobium electrical lead-in wire surrounded by an alumina insulator which is carried by a niobium ferrule, the feedthrough being particularly adapted for being welded to the titanium container of an implantable medical device. The niobium and alumina parts are joined together by means of a pure gold braze, the surfaces of the alumina being first metallized with a layer of niobium, titanium or niobium/titanium and an optional overlying layer of gold.

Abstract: A sodium-sulfur storage battery comprises an alpha alumina ring, a sodium conductive solid electrolyte tube and solder glass jointing said ring and said tube together; and is characterized in that the alpha alumina ring is provided at its open end with a groove for collecting the solder glass, a width of said groove is in a range from 0.2 mm to 5 mm and a depth of said groove is in a range from 0.2 mm to 10 mm. A surface of the solder glass is formed at a position inner than an end surface of the alpha alumina ring. Said groove may have a section of a rectangular shape. An inside surface of said groove may have a section of a round shape or an oblique section.

Abstract: A terminal pin extends through a first housing portion and has a flange. A hard bead having a high melting temperature is disposed on the flange. At least one layer of insulating material is disposed on the bead and is provided with a lower melting temperature than the bead. A second housing portion is attached to the first housing portion as by welding to define a housing. The layer of insulating material is melted and the terminal pin is pressed in a direction, while the layer is molten, to eliminate any air pockets in the layer and to provide for a hermetic sealing of the layer of insulating material to the bead, the terminal pin and the housing. Instead of a single layer of insulating material, at least a pair of insulating materials may be used. These layers may have melting temperatures less than the bead and the layer closest to the bead may have a higher melting temperature than the layer removed from the bead. The assembly of the connector may be accomplished by the rotation of a turntable.

Abstract: A terminal construction comprises a body having one or more apertures therethrough, a pin element in each of the apertures and a seal element in each of the apertures hermetically sealing and electrically insulating between the adjacent pin element and the body. Each of the pin elements comprises first and second pin sections and a fusible section which interconnects the first and second pin sections in substantially aligned relation at a point in the extent of the pin element where it is not bonded to the adjacent seal element. The fusible sections are made of a material having a melting point which is well below the softening point of the material from which the seal elements are constructed.

Abstract: A universal seal particularly for use in a lithium battery having a metal end closure, the end closure having a web with parallel planar upper and lower web surfaces and a circular opening in the web, includes an annular eyelet having substantially parallel planar upper and lower surfaces and a central aperture with a terminal pin sealed in the aperture and projecting substantially perpendicularly to the planes of the surfaces. The eyelet has chamfered upper and lower perimetric edges, symmetrically positioned about a plane parallel to and equispaced from the upper and lower surfaces of the eyelet. The eyelet is of a diameter relative to the diameter of the web opening to permit a chamfered edge of the eyelet to engage a sharp arras of the web defining the margin of the web opening in substantially line contact, intermediate the width of the chamfered edge. The closure and eyelet are then joined by a weld between the closure and the eyelet around the meeting line.

Abstract: A method of forming a hermetic seal with high hermeticity includes the steps of subjecting metal components or stock to hot isostatic pressing, forming a pin or body from the stock, and bonding the pin to a surface defining an opening in a hermetic body. A terminal with high hermeticity is provided by a metal component subjected to hot isostatic pressing and a seal bonded to the pin and body. The seal can be a glass to metal seal or ceramic to metal.

Abstract: Glass-to-metal hermetic seal of the compression type in which a central metal eyelet is sealed to a central conductor, the eyelet being bondable to and having a coefficient of expansion characteristic compatible with glass in which the eyelet is made non-ferromagnetic to eliminate unwanted induction heating and losses in pulsatory current carrying operation. The method of forming the seal is disclosed.

Abstract: A hermetic terminal assembly wherein a radially extending flange on a current conducting pin that extends through a hole defined by a cover member adapted to be secured to an opening in a motor housing is surrounded by an electrically insulating sleeve with the inner axial extremity of the sleeve extending at an axial location relative the pin substantially beyond the inner face of the radially extending flange to provide an extended tortuous path between the flange on the pin and the cover member, the pin having a reduced neck portion on the inner end thereof adjacent the inner face of the flange to provide a fuse-like area.

Abstract: A hermetic terminal assembly wherein a radially extending flange on a current conducting pin that extends through a hole defined by a cover member adapted to be secured to an opening in a motor housing is surrounded by an electrically insulating sleeve with the inner axial extremity of the sleeve extending at an axial location relative the pin substantially beyond the inner face of the radially extending flange to provide an extended tortuous path between the flange on the pin and the cover member, the pin having an aperture extending therein on the inner end thereof within the compass of the sleeve, adjacent the inner face of the flange to provide a fuse-like area.

Abstract: A ferrule made from an electrically conductive material has a coefficient of thermal expansion which changes at a particular rate with temperature changes. The ferrule is attached to an electrically conductive lid as by the application of heat and has a body portion pivotally movable at a particular position, such as a heat sink, on the body portion. Such heat sink has a minimal thickness in the body portion. When the ferrule is being attached to the lid as by heat, the heat becomes concentrated in the ferrule at the heat sink. A first ceramic material disposed within the ferrule has hard and rigid properties and is supported by the ferrule above the heat sink. The first ceramic material is preferably fused partially to the ferrule to provide for variations in its pivotal disposition relative to the ferrule. A second ceramic material within the ferrule is fused to the ferrule and the first ceramic material. The second ceramic material has more amorphous properties than the first ceramic material.

Abstract: First and second members spaced from each other are hermetically sealed by fused insulating materials. The insulating materials are partially amorphous and partially crystalline. The insulating materials have substantially identical characteristics. However, a first one of the insulating materials is more crystalline than a second one of the insulating materials.A third insulating material may also be included and may be more crystalline than the first insulating material. The first, second and third crystalline materials may have substantially identical compositions.The second insulating material may have nonwetting characteristics relative to the second member. This causes the second insulating member to have a domed configuration to increase the length of the dielectric leakage path. The third insulating material may be spaced from the second insulating material and may be provided with a flat surface to receive other members in abutting relationship.

Abstract: An insulating member formed from a suitable hydrocarbon such as polyether ether ketone may be molded into any desired shape at a temperature of approximately 700.degree. F. and a suitable pressure of approximately 10,000-12,000 psi. An epoxy insulating material hermetically seals the insulating member to an electrically conductive member and a metallic housing. The insulating member and the epoxy insulating material maintain the hermetic seal through a suitable range of temperatures such as between ambient and approximately 400.degree. F. and through a suitable range of pressures such as between atmospheric and approximately 60,000 psi. The epoxy insulating material is first applied to the surfaces of the conductive member and the metallic housing, one of these surfaces being preferably flat, and the insulating member is then inserted into the space between the conductive member and the metallic housing.

Abstract: First and second spaced members are hermetically sealed by a partially amorphous and partially crystalline insulating material. The insulating material is non-hygroscopic and is able to withstand forces of about 26,000 psi at about 700.degree. F. It may provide resistances of at least 10,000 megohms even when subjected to 500 volts AC or DC and to steam at about 212.degree. F. for three (3) days. A second insulating layer may be fused to the first insulating layer with essentially the same properties and composition as the first layer. However, the second layer may be more crystalline than the first layer to provide a mechanical and chemical barrier. The insulating materials may be formed from the oxides of lead, zinc, aluminum, silicon, cerium, lanthanum, cobalt, sodium, zirconium, bismuth and molybdenum. The oxides of lead, silicon, bismuth and sodium may be glass formers. The oxides of cerium, lanthanum and zirconium may form crystals. A mixture of the oxides may be heated to at least 2000.degree. F.

Abstract: A hollow sleeve is made from an electrically conductive material and is provided with an integral shelf having at least one hole extending through the shelf. A terminal pin extends through the hole in spaced relationship to the shelf. The terminal pin may be made from the electrically conductive material and may be clad with a noble metal such as platinum. Insulating material extends through the hole in the shelf and hermetically seals the hollow sleeve and the terminal pin. The insulating material may cover the shelf to increase the electrical resistivity between the terminal pin and the sleeve. The electrically conductive material has a coefficient of thermal expansion which increases at a particular rate through an extended range of temperatures with progressive changes in temperature. The insulating material has a coefficient of thermal expansion which increases at approximately the particular rate through the extended range of temperatures with the progressive changes in temperature.

Abstract: First and second members are disposed in spaced relationship to each other. The members may be electrically conductive. The first member may be provided with a particular coefficient of thermal expansion which is higher than the coefficient of the second member. A plurality of layers of insulating material are disposed between the first and second members and are hermetically sealed to one another and to the first and second members. Each of the layers of insulating material has a coefficient of thermal expansion less than the particular coefficient. The progressive layers of insulating material from the first member have coefficients of thermal expansion of decreased value. This causes the layers of insulating material to have coefficients of thermal expansion which approach the coefficient of the second member with progressive distances toward the second member.

Abstract: First and second spaced members are hermetically sealed by a partially amorphous and partially crystalline insulating material. The insulating material is non-hygroscopic and is able to withstand forces of about 26,000 psi at about 700.degree. F. It may provide resistances of at least 10,000 megohms even when subjected to 500 volts AC or DC and to steam at about 212.degree. F. for three (3) days. A second insulating layer may be fused to the first insulating layer with essentially the same properties and composition as the first layer. However, the second layer may be more crystalline than the first layer to provide a mechanical and chemical barrier. The insulating materials may be formed from the oxides of lead, zinc, aluminum, silicon, cerium, lanthanum, cobalt, sodium, zirconium, bismuth and molybdenum. The oxides of lead, silicon, bismuth and sodium may be glass formers. The oxides of cerium, lanthanum and zirconium may form crystals. A mixture of the oxides may be heated to at least 2000.degree. F.

Abstract: In various embodiments of improvements in a hermetic refrigeration terminal of the type shown and described in U.S. Pat. No. 4,296,275, the flange of the current conducting pin is made non-circular, the pin is necked with a circumferential groove or, in the area in which it passes through the seal, is enlarged, or both, and, when a plurality of openings is provided in the bottom wall of the cup-shaped body of the terminal, a corresponding number of insulating sleeves are joined by a common web or spider, which may be provided with a zone of weakness or may be made flexible as compared with a rigid ceramic web, for example. In still other embodiments, a pin is made up of a core structure of copper or other highly electrically conductive material and a tube, of steel or other material compatible with the seal material, that extends through the reach of the seal, the tube being hermetically secured to the core structure. The flange is either provided on the core structure itself or on the tube.

Abstract: First and second members spaced from each other are hermetically sealed by fused insulating materials. The insulating materials are partially amorphous and partially crystalline. The insulating materials have substantially identical characteristics. However, a first one of the insulating materials is more crystalline than a second one of the insulating materials.A third insulating material may also be included and may be more crystalline than the first insulating material. The first, second and third crystalline materials may have substantially identical compositions.The second insulating material may have nonwetting characteristics relative to the second member. This causes the second insulating member to have a domed configuration to increase the length of the dielectric leakage path. The third insulating material may be spaced from the second insulating material and may be provided with a flat surface to receive other members in abutting relationship.

Abstract: A terminal assembly includes a ferrule and a terminal pin disposed in spaced relationship to the ferrule. First layers made from a first ceramic insulating material are disposed in spaced relationship to each other in the space between the terminal pin and the ferrule. The layers are primarily polycrystalline but partially amorphous. Second layers made from a second ceramic insulating material are disposed in spaced relationship to each other in the space between the terminal pin and the ferrule and between the first layers. The second layers are fused to the terminal pin and the ferrule and the first layers. The second layers are primarily amorphous but partially polycrystalline. Layers of a third insulating material having relatively high characteristics of electrical insulation and having a lower melting temperature than the first and second layers may be respectively disposed at the opposite ends of the terminal assembly.

Abstract: A ferrule is provided with an opening extending through the ferrule and a terminal pin is disposed in the opening in spaced relationship to the ferrule. A plurality of insulating members are disposed on the terminal pin in the opening in a stacked relationship. Each of the insulating members is fused to the terminal pin and the ferrule. Each of the insulating members in the stack has a higher temperature of fusion than the preceding members in the stack. The insulating members in the stack are progressively fused to the ferrule and the terminal pin by the application of progressive temperatures to the terminal pin, the ferrule and the insulating members.The insulating members having the highest temperature of fusion are provided with properties of being able to withstand large forces without any degradation of the fusion with the terminal pin and the ferrule. The insulating members of the reduced temperatures of fusion are able to withstand other types of shock such as sudden changes in temperature.

Abstract: A material hermetically seals two members. One member may be titanium or a titanium alloy and the other member may be a noble metal such as platinum. The seal is resistant to acids and alkalis and is substantially impervious to shocks resulting from mechanical forces or abrupt changes in temperature. The material includes a pair of fluxes having different melting temperatures and a stuffing material including the oxides of zinc and zirconium. The oxides of zinc and zirconium become crystallized at the surface between one of the members and the material. An oxygen valence bond is also produced between the material and such member. The material is more amorphous at the boundary with the second member than at positions removed from such member. The material is formed by progressive heatings for at least a pair of periods of time insufficient to crystallize all of the material and by rapid coolings of the material after each of such heatings.

Abstract: A through bulkhead electrical connector (10) is disclosed of the type having interfacial seals (30, 32) on either side of the connector precisely located axially for obtaining an effective interfacial seal. A standard glass bead (20) is fused to the connector shell (12) at one end thereof with carbon fixturing (44) enabling precise location after fusing. The opposite face is defined by a standard resinous insert (38) axially located by engagement with a shoulder (40) machined into the connector shell (12) with the intervening space (52) being filled with a cured mass of epoxy (42) to secure the resinous insert (38) in position.

Abstract: A header device for use with an electrochemical cell requiring a hermetic seal between the header, the terminal pin, and the body of the cell. A stainless steel header is sized to fit the cell body and hermetically sealed to the body. An annular glass ring is bonded to the header. Centered in and bonded to the ring is a terminal pin consisting of a solid central core of material selected from nickel and nickel alloys and a stainless steel sleeve surrounding the core. The thickness of the sleeve is less than 0.01 inches. The annular glass ring electrically insulates the stainless steel header from the terminal pin. The sleeve is bonded to the core by a nickel braze. The bonding of the pin to the ring and the ring to the header is accomplished at an elevated temperature of at least 1800 degrees Fahrenheit.

Abstract: While avoiding the quartz fusion technique, an accurate and vacuum-tight electric leadthrough is provided which in addition is mechanically rigid. The electric conductor is fixed at the interior of a cell through an aperture by means of a ring of polytetrafluoroethylene in such a manner that the conductor is held in the center of the aperture. Over the ring and inside the aperture, a layer of cyano acrylate talcum cement is provided. Inside this layer in the aperture, a layer of a granular filler which is soaked with cyano acrylate adhesive is provided. Finally, the outermost part of the aperture is filled and sealed with a layer of cyano acrylate talcum cement.

Abstract: A method for metallurgically bonding a ceramic element to a metal member to produce a seal for electrochemical cells whereby the ceramic element is first plated with a metal that can be chemically removed prior to or subsequent to the bonding of the components together using a fusible metal.

Abstract: Acid and alkali oxides are smelted for an extended period of time at a first elevated temperature above their melting temperatures. The smelted mixture is then quenched in water and fritted. The fritted mixture is then disposed between a pair of members which are to be hermetically sealed relative to each other. The fritted mixture is then at least partially fused in an oxygen atmosphere at a second temperature below the first temperature for a relatively short period of time. The at least partially fused mixture is then rapidly cooled in air. In this way, the mixture is provided with a partially amorphous state and a partially crystalline state. The crystals in the mixture are disposed primarily at the borders of at least a particular one of the members to be sealed.The mixture hermetically seals the two members, is resistant to acids and alkalis and inhibits the propagation of cracks.

Abstract: A terminal member of a storage battery and an annular member surrounding the terminal member are bonded together hermetically through an annular bonding material member which comprises at least two annular bonding material members spaced apart from each other by at least one annular space which is formed in the middle of the depth of the through opening of the annular member in which the terminal member is inserted.

Abstract: A vacuum-tight assembly, such as a discharge tube for a sodium vapor arc lamp, includes a high density polycrystalline ceramic body, such as alumina or yttria, having a cavity, at least one closure member, and a sealing material. The closure member is formed from a molybdenum-titanium alloy containing a small amount of nickel, cobalt, or copper. The nickel, cobalt, or copper forms a relatively low melting eutectic with titanium, thereby facilitating fabrication of closure members by sintering. The closure member and the sealing material have thermal coefficients of expansion closely matched to the thermal coefficient of expansion of the ceramic body over a wide temperature range.

Abstract: A multilayer circuit board (10) for putting semiconductor devices thereon consists of conductor layers (6, 60, 61, 62, 63) made of a metal selected from the group consisting of Au, Ag, Cu and an alloy thereof, insulating material (2, 7) made of glass-ceramic and an alumina sintered plate (1). The glass-ceramic is comprised of borosilicate glass and alumina and has a low dielectric constant and a thermal expansion coefficient approaching that of the semiconductor devices. The alumina sintered plate (1) is placed between the ground and supply voltage conductor layers (62, 63) and the signal conductor layers (60).

Abstract: In a hermetic refrigeration terminal with a cup-shaped body having a bottom wall and at least one opening in the bottom wall defined by an annular lip extending into the cup, and a current carrying pin extending through the opening and beyond the lip on both ends, and a seal bonding the pin to an inside surface of the lip, a flange is provided extending generally radially from the pin and located axially between the lip and the inner end of the pin, and an electrically insulating sleeve surrounding the pin and extending axially between the flange and the lip, the sleeve being at least in part larger in diameter than the opening and being bonded at its end opposite the flange to the seal.

Abstract: Pass through having a glass part disposed in an opening formed in a metal case part, an insulator for lengthening the leakage path connected at an end face thereof to at least one end face of the glass part and at least one electric conductor extending through the glass part and the insulator, the connection between the insulator and the glass part including a fused glass junction.

Abstract: An electric discharge tube is provided with a hermetically sealed leadthrough which electrically connects electrodes on the inner and outer walls of the envelope. The leadthrough consists of an aperture in the envelope having a conductive layer provided on the wall of the aperture. The aperture is hermetically sealed by means of a plug of thermally devitrified glass which is provided in the form of a suspension of a devitrified glass powder in an organic binder. To manufacture the leadthrough, the envelope of the tube is subjected to temperature treatments in which at a first temperature range the binder is fired from the suspension in an oxygen-containing atmosphere, and at a second temperature range the devitrifiable glass is devitrified in a non-oxidizing atmosphere. A hermetically sealed leadthrough results, without excessive oxidation of the electrodes, while the deformation of the glass envelope at the area of the leadthrough is avoided.

Abstract: A hermetic electrical terminal construction adapted for connection to the outer housing of a hermetic motor compressor unit so that current may be carried to the compressor motor from an external source. The terminal comprises a body member welded or otherwise secured to the compressor outer housing and a plurality of conductor pins secured to and extending through the body member. Each of the conductor pins, which may be made of stainless steel, copper or other suitable material, comprises a first segment disposed within the housing, a second segment disposed outside the housing, and an intermediate segment connecting the first and second segments, the intermediate segment being disposed primarily within the body member. Electrical insulating and sealing material, such as glass or epoxy potting, surrounds the pin intermediate segment and forms a hermetic seal between the pin intermediate segment and the body member.