Abstract: A glazing panel which is transparent and fire-resistant, including at least one vitreous structural ply including at least one rough-faced ply composed of vitreous material having a mean coefficient of linear thermal expansion over a temperature range of 20.degree. C. to 300.degree. C. which is not greater than 7.5.times.10.sup.-6 K.sup.-1 and having a rough face for which roughness, R.sub.tm, is not less than 0.1 .mu.m; and at least one layer of intumescent material directly bonded to and in contact with the rough face of the at least one rough-faced ply.

Abstract: Cooking ranges with cooking surfaces in the form of a glass ceramic cover include functional elements such as operation and signal elements integrated into the cooking range. For improved utility and maintenance these functional elements are combined in at least one functional area forming a functional part (unit) arranged to be spatially separate from the cooking surface and independently replaceable.

Abstract: The invention is directed to a cooktop unit for mounting in a frame structure or in a cutout of a work surface. The cooktop unit includes a plate made of glass ceramic and this plate defines the cooking surface. The cooktop unit also includes a metal frame permanently-elastically connected by a silicone adhesive to the lower side in the peripheral region of the plate. A leg of the holding frame connected to the cooktop plate extends flush from the edge of the plate inwardly and parallel to the plate and then bends downwardly at right angles to the plate. The adhesive effects the force-tight connection or bond between the plate and the holding frame. The adhesive defines a peripheral silicone flange at the lateral edges of the plate and at the lateral edge of the leg cemented to the plate. This silicone flange terminates flush with the surface of the plate and projects beyond the lower edge of the leg connected to the plate to form a sealing lip.

Abstract: The electrolytic process for dissolving platinum, platinum metal impurities and/or platinum metal alloys, in particular with contents of Rh, Pd, Ir, Au and Ag, in 6 to 8N aqueous hydrochloric acid is characterized by a dissolution process that takes place in an electrolysis cell subdivided by a cation exchanger membrane into an anode and cathode compartment containing anode and cathode respectively, and, if appropriate, in the presence of platinum metal salts or platinum metal acids, at temperatures between 50.degree. and 110.degree. C., under potentiostatic or voltage-controlled conditions in the range of 2.5 V to 8 V and under a current density of 0.3 to 7.0 A/dm.sup.2. The potential across the anode and the cathode is controlled so that chlorine gas is generated and the anode is contacted with the aqueous hydrochloric acid solution and the chlorine gas in impulse-form.

Abstract: Large area decorations of glazings, ceramic paint or the like on glass ceramic, glass, ceramic or similar meltable substrates, in particular on glass ceramic cooking plates, are applied by the new method by means of a laser beam which is widened linearly over the entire width of the area to be decorated, as it were in a zone melting method. The linear energy supply zone is advanced at a speed high enough for essentially only the decorating material to be melted on or burnt in but ensuring that the thermal conduction front does not move appreciably into the substrate material.

Abstract: A light-emitting unit is disclosed for optical fiber lightguides. The unit is especially useful for a signal display device for the display of traffic signals. The unit exhibits light fed by way of lightguides to a raster dot in the display area, a light entrance end for connection with the feeding end of the associated lightguide, and a light exit end forming, in the display area, the light exit surface of the raster dot. The unit includes a light-guiding central zone between the light entrance and light exit ends. This zone flares toward the light exit end substantially in a conical or pyramidal fashion. The light-emitting unit according to this invention is distinguished in that a tapering extension section is provided for obtaining a wider emission angle with a uniform, high light intensity over the entire angular range at the light exit end.

Abstract: A cooking appliance having a plate of a material transparent to thermal radiation, such as glass-ceramic, having adjustable heat sources distributed under, in, or on the plate, which are heated by direct or indirect heat transfer, electrically, and/or by gas and/or other heating means, the plate possessing at least two types of heat sources which use different kinds of heat transfer, these all being heated by means of gas.

Abstract: The device for holding a built-in cooking apparatus, especially a glass ceramic cooking apparatus, in an opening provided in a cooking apparatus receptacle (1), includes a cooking apparatus housing (2) containing heating elements; a cooking apparatus upper portion including a cooking panel (6) and a border frame (4, 5) around the cooking panel (6); a releasable clamping connection device (3, 8) for releasably attaching the cooking apparatus upper portion from above with the cooking apparatus housing; and an attachment device (3) for attaching the cooking apparatus housing (2) in the cooking apparatus receptacle (1).

Abstract: The electrolytic process for obtaining platinum of high purity from concentrated hydrochloric acid solutions of a platinum alloy containing Rh, Ir and/or Pd proceeds with simultaneous depletion of noble and base metal impurities from the solution. This electrolysis process takes place in an electrolysis cell having an anode and cathode and subdivided by a teflon cation exchanger membrane under potentiostatic or, voltage-controlled conditions with a potential applied across the anode and cathode of 8 V to 16 V, preferably 11.5 to 12 V, at a current density of 12.5 to 37.5 A/dm.sup.2, preferably 22.5 to 35 A/dm.sup.2, to form a purified platinum-containing solution from which the high purity platinum can be obtained and also platinum alloy metal component deposits on the anode and cathode. The concentrated hydrochloric acid solution of the platinum alloy can have a platinum alloy content of 50 to 700 g/l and total metal impurities of not greater than 5000 ppm.

Abstract: The electrolytic process for obtaining platinum of high purity from a concentrated hydrochloric acid solution of contaminated platinum containing base and noble metal impurities includes electrolyzing the hydrochloric acid solution containing the contaminated platinum in an electrolysis cell subdivided by a cation exchanger membrane under potentiostatic or voltage-controlled conditions with a voltage of 2.5 V to 8 V applied across the anode and cathode under a current density of 0.3 to 12.5 A/dm.sup.2 so as to form a refined platinum-containing solution and a platinum alloy metal deposit. The concentrated hydrochloric acid solutions used in the process can have a contaminated platinum content of 50 to 700 g/l and total metal impurities of .ltoreq.5000 ppm. In contrast to the known prior art processes, the process according to the invention operates with minimal requirements in terms of safety technology and equipment, causes a minimal environmental burden and is far less time-consuming and more economical.

Abstract: A vacuum suction lifter for holding and transferring objects with a temperature of more than 400.degree. C., in particular glass screens, is provided, the contact surface (4) of which is raised with respect to a central surface (6), and which is covered with a heat-resistant, sufficiently tight textile structure of poor thermal conductivity, preferably a glass fibre fabric, as the sealing element (16). The contact surface (4) matches the contour of the workpiece to be lifted.

Abstract: Process for the formation of a removable surface area of a specific depth on a substrate with all coatings seated on the surface of the substrate, wherein a layer of a material, thin as related to the substrate, with a thermal expansion coefficient strongly deviating as compared with the substrate, is bonded to the substrate at one temperature and is subsequently cooled to another temperature.

Abstract: A process for electrolytic production of fine-grained, single-phase, metallic alloy powders, especially powders of intermetallic compounds as well as noble metal alloy powders, is described in which powdery metallic precipitates are galvanically produced on the cathode from an electrolytic precipitating bath known in the art, which contains in solution the metals to be precipitated, under electrolysis conditions causing a powder precipitation known in the art. For the production of alloy powders with defined properties, it is determined, first in preliminary tests by gradual increase of the cathode potential with otherwise constant process parameters, the minimum cathode potential at which single-phase alloy powders result and then the powder precipitation is potentiostatically performed in a cathode potential at or above the minimum for the single-phase alloy precipitation.

Abstract: An optical waveguide is disclosed with a substantially planar substrate and a waveguide layer applied to the substrate. The invention resides in that the substrate consists of a synthetic resin or of a material having a high organic proportion. This has the advantage that the high index of refraction of the inorganic waveguide layer is combined with the material properties of the synthetic resin substrate, such as, for example, breaking resistance, plastic and thermoplastic moldability, photochemical structuring ability, and others.

Abstract: A process and apparatus are described for the production of a filter in the form of a ceramic honeycomb body monolith, starting with a blank of the honeycomb body monolith with the bilaterally open ducts. An image-recording and processing system scans the end faces of the monolith and determines the deviations of the actual geometry of the ducts to be alternatingly sealed from the geometry of an idealized honeycomb body. The image-processing system determines zones on the respective end face of the monolith which correspond, within predeterminable tolerances, to the geometry of the idealized honeycomb body, wherein zones are determined having a maximally high number of ducts. In correspondence with the determination of the aforementioned zones, a processing route is established which predetermines which one of several metering heads with a varying number of nozzles will be activated. The nozzles then inject a plugging compound into the thus-determined ducts.

Abstract: A process is provided for output control and limitation in a heating surface made from glass ceramic or a comparable material, especially a glass ceramic cooking surface. In a heating surface, in which the individual heating zones are each heated with several heating elements, switchable and controllable independent of one another, it is provided according to the invention that all points of the areas essential for a stress case, especially local overheating, are detected by several temperature sensors, independent of one another, which are placed in the area of the heating zone, to switch and to control the individual heating elements, independent of one another so that the output distribution in the heating zone area is largely matched to the locally varying removal of heat.

Abstract: In order to improve the flexibility of one-piece quartz mounts, the section of the current lead pins that is pinched into a lug and projects beyond the bottom plate is reduced to a web between the bottom plate and the mounting section. The web is bent twice between the bottom plate and the mounting region so that there are formed a horizontal first web section and a second vertical section. The elasticity of the mounts are thereby further improved. The mounting section can be trimmed in the zone where the quartz disk is mounted.

Abstract: For the preparation of high purity glass powder having a mean particle size of .ltoreq.10 .mu.m, glass powder having a larger particle size up to 300 .mu.m is ground to the desired particle size in a stirred mill with glass grinding elements in the presence of a grinding liquid comprising water or preferably a mixture of at least 50% by weight of water and at least one water-soluble, oxygen-containing organic compound having 1 to 5 carbon atoms in the molecule, e.g., tert.-butyl alcohol; the ground slurry is then frozen, and the solvent is subsequently removed from the frozen slurry by freeze-drying. A resultant glass powder with a mean particle size d.sub.50 of 0.5 to 2 .mu.m is particularly suitable as a filler for synthetic resins in the dental sector.

Abstract: In a window for ovens, in particular household baking ovens, with a window structure that consists of several panes (10, 28, 32), at least one of the panes (28) is angled in comparison to the other panes (10, 32). Because of this a lower outer surface temperature results on the outer pane (32) of the multiple pane arrangement turned away from the oven inner chamber (12) with elevated temperature. The frame (16, 34) of the multiple pane arrangement can also have openings (36) on the top and bottom in the area between the outside pane (32) and the center pane (28). In combination with this measure, which permits convection of the outside air through the outer pane intermediate space (arrows 38), an additional reduction of the temperature of the outer pane (32) can be achieved. This air convection can be increased by the fact that the angled center pane (28) converges toward the outer pane (32) at the top.

Abstract: To automatically examine medical ampuls to determine their dimensional accuracy, the ampuls are moved in a horizontal position on a chain conveyor in a cadenced manner through an optoelectronic testing station. At the testing station, each ampul is lifted out of the chain conveyor and illuminated by light from a diffusely radiating illumination source perpendicularly to the longitudinal axis of the ampul. In the case of one-point-cut ampuls, the ampuls are rotated about their longitudinal axes during the testing process. The light passing through the ampul is received by a photodiode camera system which converts the images into electrical image signals. These image signals are evaluated with respect to their changes in intensity produced by the tested ampul in order to generate measurement values for the desired ampul dimensions and, if applicable, for their deviations from standard ampul dimensions.