Patents Assigned to W. C. Heraeus GmbH
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Patent number: 4355082Abstract: To prevent metal fatique, particularly when making a button loop, or nail head thermo compression bond connection to a semiconductor, the connecting wire has a core of copper, or a copper alloy of at least 60% copper content, and a jacket of aluminum, or aluminum alloy, of at least 95% aluminum content; in a preferred form, the core is 94% copper and 6% tin, and the jacket is, for example, 99% aluminum, 1% silicon; 96% aluminum, 4% copper; or 99% aluminum, 1% magnesium, all percentages by weight.Type: GrantFiled: June 17, 1981Date of Patent: October 19, 1982Assignee: W. C. Heraeus GmbHInventors: Albrecht Bischoff, Fritz Aldinger
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Patent number: 4339644Abstract: A low-power electrical contact particularly suitable for switching and plug-in connections. The contact comprises an outer contact layer and a substrate composed of a copper base alloy. The contact layer consists essentially of an alloy of 35-55% by weight gold, 18-33.5% silver, 30-40% palladium, and (i) 1-6% indium, or (ii) 0.5-2% tin together with 0.5-2% indium. An intermediate layer of nickel or copper-nickel may be interposed between the contact layer and the substrate.Type: GrantFiled: October 1, 1980Date of Patent: July 13, 1982Assignee: W. C. Heraeus GmbHInventors: Fritz Aldinger, Elke Biberbach, Albrecht Bischoff, Nils Harmsen
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Patent number: 4336329Abstract: To establish predetermined humidity levels within a sterile treatment chamber, and maintain sterility, water, preferably deionized, is conducted to an evaporator outside of a container defining the treatment chamber, to be there heated to superheated steam, for example in the order of 300.degree. C., and conducted to a bypass duct (1) in atmospheric communication with the treatment chamber (10), for mixing with the atmosphere within the treatment chamber. Preferably, the treatment chamber is surrounded by heat exchanger elements, such as electrical heating wires and/or cooling coils, the heaters being controlled to rapidly heat the treatment chamber to a temperature in the order of 180.degree. C. during pauses of treatment for sterilizing the interior of the container, and/or maintaining temperature levels at a desired treatment level in operation.Type: GrantFiled: June 17, 1980Date of Patent: June 22, 1982Assignee: W. C. Heraeus GmbHInventors: Peter Hesse, Friedbert Schinle, Helmut Loscher
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Patent number: 4336496Abstract: To measure contact resistance between a probe and a terminal sample, and to insure gentle engagement of the probe on the sample, a scale beam is used which has an adjustable engagement weight, and which is lowered under control of a cam disk with an interposed magnetic system in which two magnets of equal polarity are placed adjacent each other so that, due to the repelling force of the two magnets, jolt-free, vibration-free engagement is possible, providing in effect a magnetic buffer. Preferably, the probe is a test wheel which, upon lowering from a raised position, can be disengaged from the drive motor which, when the test probe is off the sample terminal, rotates the wheel so that a fresh wheel surface is available for subsequent measurement. Engagement force can be controlled by suitable positioning of a counter weight, for example by a servo motor.Type: GrantFiled: October 1, 1980Date of Patent: June 22, 1982Assignee: W. C. Heraeus GmbHInventors: Rudolf Schnabl, Helmut Becker
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Patent number: 4326889Abstract: Essentially spherical gold particles are mixed with an evaporatable or combustible paste-forming material, for example terpineol and ethylcellulose, the gold being, by weight, 75% to 95%, spherical, and having a diameter of between 0.8 to 1.2 .mu.m, with a maximum particle diameter of 2 .mu.m. The gold is mixed with the additives to form a paste, just before being applied at a thickness of from between 5 to 30 .mu.m on a dental prosthesis, preferably about 10 to 20 .mu.m, and then fired at a temperature of between about 950.degree. C. to 1070.degree. C. for a period of between 2-5 minutes, preferably about 960.degree. to 1000.degree. C. of from between 2-3 minutes, providing an excellent base for application of a porcelain layer thereto.Type: GrantFiled: October 9, 1979Date of Patent: April 27, 1982Assignee: W. C. Heraeus GmbHInventor: Franz Sperner
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Patent number: 4310823Abstract: To permit adhesion of a strain gauge grid applied to a high temperature plastic, such as a polyimide, the side of the strip of polyimide which is to be attached to the support frame, the strain of which is to be measured, has a solderable surface applied thereto which consists, essentially, of three sublayers, as follows:A first sub-layer of from 1 to 8 .mu.m thickness of chromium nickel alloy, containing, for example, about 20% (by weight) of chromium, or an iron chromium nickel alloy containing, for example, about 50% iron, 49% nickel and 1% chromium (by weight);a second sub-layer of at least about 5 .mu.m thickness, preferably about 7.5 .mu.m thickness of nickel and a third outer sub-layer of gold, for example, between about 4 to 10 .mu.m thick, preferably, about 7 .mu.m. The various sub-layers are applied, for example, after cleaning of the element with a volatile hydrocarbon, or toluol, by vapor deposition, for example, vaporization from a tungsten boat of the respective materials.Type: GrantFiled: January 14, 1980Date of Patent: January 12, 1982Assignee: W. C. Heraeus GmbHInventors: Norbert Rucker, Michael Sellschopp, Hans-Ullrich Fuchs
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Patent number: 4303635Abstract: Optical-grade zinc sulfide bodies produced by the CVD technique and subjected to an aftertreatment under a high gas pressure and at elevated temperature possess improved optical properties. They are suited for use as infrared windows.Type: GrantFiled: May 15, 1980Date of Patent: December 1, 1981Assignee: W. C. Heraeus GmbHInventors: Fritz Aldinger, Waltraud Werdecker
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Patent number: 4273578Abstract: A method for recovering rhodium from a residue of the oxo synthesis or of a hydroformylation which comprises contracting said residue with sulfur and separating and converting the resultant rhodium-containing precipitate to rhodium or a rhodium compound in a manner known per se.Type: GrantFiled: March 17, 1980Date of Patent: June 16, 1981Assignee: W. C. Heraeus GmbHInventors: Paul Nesvadba, Gisela Weigl
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Patent number: 4159413Abstract: A transport drum is located adjacent two positions, one being a severing position in which a severing punch is located adjacent the drum to punch out contact plates in the order of at most 3 mm surface area from a strip of contact material, and place the punched-out plates in suitable openings formed at the circumference of the drum which, upon indexing rotation to the welding position, transports the plates thereto. Punch elements and welding electrodes have one portion of the elements located inside the drum, the other outside the drum adjacent the respective position. The contact carrier, for example in strip form, is fed to the drum, preferably tangentially, the contact plate being welded on the carrier at the welding position. Preferably, and simultaneously with the severing operation, the contact strip is deformed in advance of the severing so that the next subsequent severing operation will already accept a deformed element to provide a welding bump for concentrated application of spot welding current.Type: GrantFiled: September 12, 1977Date of Patent: June 26, 1979Assignee: W. C. Heraeus GmbHInventors: Bernhard Rosenstock, Karl Troger
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Patent number: 4155730Abstract: The invention provides jets, nozzles, and perforated base plates produced from alloys that consist essentially of 40-70% platinum, 20-50% palladium, 5-15% rhodium, and 0.5-4% gold. They are resistant to attack by molten glass, particularly glass containing silicates.Type: GrantFiled: December 20, 1977Date of Patent: May 22, 1979Assignee: W. C. Heraeus GmbHInventors: Elke Biberbach, Nils Harmsen
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Patent number: 4149883Abstract: The present invention provides electrical contacts having at least one contact surface consisting essentially of a silver palladium alloy containing 10-50 percent by weight palladium, 0.1-8 percent copper, 0.1-6 percent indium, 0.1-6 percent tin, and the balance essentially silver.Type: GrantFiled: July 27, 1977Date of Patent: April 17, 1979Assignee: W. C. Heraeus GmbHInventors: Nils Harmsen, Franz Sperner
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Patent number: 4142940Abstract: To provide a disposable container which can be prefabricated under sterile conditions, a pair of concentric plastic rings are formed with interfitting, interlocking projection and recess means permitting the rings to be snapped together, the rings being additionally formed with matching fitting surfaces to interpose the edge portion of a gas permeable membrane therebetween so that, when the membrane is placed on the outer ring and the two rings are snapped together, the membrane is irremovably held. Preferably, the outer ring is made of a softer, yielding plastic, the inner ring of a more rigid plastic, with a projection snapping into a groove formed on the inner, more rigid ring, and the matching clamping surfaces for the membrane forming a sinuous, tortuous path with a flexible projecting lip on the outer ring fitting into a recess to clamp the membrane and seal the membrane in the structure.Type: GrantFiled: September 7, 1976Date of Patent: March 6, 1979Assignee: W. C. Heraeus GmbHInventors: Manuel Modolell, Paul G. Munder, Herbert Schaus
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Patent number: 4138604Abstract: To provide low contact resistance, long life, and resistance against tarnishing under corrosive, particularly sulfur atmospheres, a substrate carrier has a layer of palladium applied thereto, of a thickness between 0.5 and 5 .mu.m, preferably between 1 and 3 .mu.m, to which a coating of gold is applied which is porous and has a thickness of only between 0.05 .mu.m and 0.1 .mu.m; the porous gold coating forms islands of gold on the palladium which, in use and as the terminal is wiped against a counter element, smears over the palladium, thus effectively covering the palladium, preventing tarnishing, and maintaining low contact resistance throughout the useful life of the terminal element.Type: GrantFiled: July 16, 1976Date of Patent: February 6, 1979Assignee: W. C. Heraeus GmbHInventors: Nils Harmsen, Horst Markhof, Walter Reichelt, Klaus-Ludwig Schiff, Horst Thiede
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Patent number: 4129765Abstract: The present invention provides low-current carrying rem-reed switch contacts, preferably for operation under vacuum or under a protective gas. The contacts comprise a medium-hard magnetic material substrate which may contain anomalies on the surface. These are covered by an intermediate layer from 1 to 20 .mu.m of at least one metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium and tantalum. This intermediate layer is then covered with a noble metal layer, for example alloys of gold or silver, and preferably by ruthenium.Type: GrantFiled: August 8, 1977Date of Patent: December 12, 1978Assignee: W. C. Heraeus GmbHInventors: Gunther Herklotz, Walter Reichelt
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Patent number: 4111690Abstract: The present invention provides a gold, silver and nickel alloy particularly useful for electrical contacts. The alloy consists essentially of 10-40% by weight silver, 2-25% palladium, 1-5% nickel, 0.1-10% indium, 0.1-3% tin, and the balance substantially gold. The invention also provides contacts comprising said alloy.Type: GrantFiled: July 26, 1977Date of Patent: September 5, 1978Assignee: W. C. Heraeus GmbHInventor: Nils Harmsen
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Patent number: 4100385Abstract: To reduce costs and permit use of a smaller amount of noble metals in nobel metal contacts, a common metal contact material which forms, in an oxygen-containing atmosphere or in air, non-porous insulating oxides, is coated with a porous noble metal or noble metal alloy cover layer, the pores or regions not covered by the noble metal or nobel metal alloy being permitted to oxidize to form a protective common metal contact material oxide, the noble metal regions in contact with the underlying contact material itself providing for the electrical connection. Preferably, the porous cover layer has a thickness of between about 0.1 to 0.2 .mu.m, and the contact material, separately or applied to a carrier, has a thickness of between 2 to 100 .mu.m, preferably about 10 .mu.Type: GrantFiled: July 16, 1976Date of Patent: July 11, 1978Assignee: W. C. Heraeus GmbHInventor: Max Wutz
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Patent number: 4072856Abstract: To permit employment of an incandescent lamp of about 3000.degree. K color temperature as a light source, the reflector reflecting light to the use area, typically an operating table, a dental chair, or the like, is constructed of a material such as glass having an index of refraction of 1.425 to 1.575, the glass readily permitting passage of infrared radiation. To provide reflected light which corresponds at least approximately to daylight, with a color temperature of 6000.degree. K., the glass is coated with a sequence of materials as set forth in table I, the materials being applied to the glass in the sequence given with increasing distance from the glass carrier, resulting in an overall reflected light of about 5500.degree. K.Type: GrantFiled: January 25, 1977Date of Patent: February 7, 1978Assignee: W. C. Heraeus GmbHInventor: Hans Eligehausen
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Patent number: 4069370Abstract: The material is applied to a substrate, for example, terminal bronze, brass, or the like, and comprises, preferably, 50 to 55% gold, 24 to 28% palladium, 15 to 20% silver, 2.5 to 3% tin, 0.08 to 0.15% iridium, 0.08 to 0.15% ruthenium, 0.1 to 0.3% copper and 0.6 to 1% indium.Type: GrantFiled: July 16, 1976Date of Patent: January 17, 1978Assignee: W. C. Heraeus GmbHInventors: Nils Harmsen, Franz Sperner
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Patent number: 4065851Abstract: To improve the bonding layer for connecting wires to semiconductor chips with contact fingers, or contact strips, on a substrate carrier, the bonding layer is formed as spongy, microporous structure, applied to discrete positions of the contact strips by screen printing, and secured to the metallic connecting strip by a diffusion zone. Preferably, the bonding layer comprises a metal of gold, palladium, silver, aluminum and copper, or an alloy of at least two of these metals, or a base alloy of one of these metals, for example gold applied as a gold paste having an average grain size of less than 5 micro-meters, the layer being between 2 to 30 micrometers thick, preferably 3 to 10 micrometers. The metal is part of a paste of the metal in an evaporative organic carrier. After screen printing, the carrier is eliminated by heating; subsequent heating converts the metal to a spongy microporous structure bonded to the substrate carrier by a diffusion zone.Type: GrantFiled: November 3, 1976Date of Patent: January 3, 1978Assignee: W. C. Heraeus GmbHInventors: Franz Kummer, Gerhard Mai, Rolf Ruthardt, Horst Thiede
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Patent number: 4050052Abstract: A substrate carrier of electrically non-conductive material has a strip of resistance platinum applied thereto; in order to avoid the use of an intermediate temperature coefficient of expansion matching layer, the substrate carrier, for example of aluminum oxide, beryllium oxide, or a magnesium silicate, has less than thirty parts per million (ppm) Fe, less than 15 ppm Cr, less than 45 ppm Pb and less than 70 ppm Si in a form capable of reacting with platinum, the sum of the impurities by these metals, if all, or more than one are present, not exceeding 20 ppm; the average thermal coefficient of expansion of the substrate does not deviate from the mean thermal coefficient of expansion of the thermometer grade platinum by more than .+-. 30%; the platinum layer has a thickness of from 0.1 to 10 .mu.m, and is applied at a temperature in the range of between about 1000.degree. C to 1400.degree. C during 60 minutes in an atmosphere containing oxygen, for example free air.Type: GrantFiled: June 14, 1976Date of Patent: September 20, 1977Assignee: W. C. Heraeus GmbHInventors: Walter Reichelt, Gunter Sauer