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: 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 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: A cooking range with a cooking zone plate made of glass, glass ceramics or similar materials. A frame for the cooking zone plate serves as edge protection on the one hand and as closing for the upper edge of the plate. On the other hand, the cooking zone plate is bonded with the frame on the edge side.According to the invention, the frame includes an attachment frame part and a visual frame part separated from the attachment frame part. The attachment frame is a standardized component that is connected with the lower plate edge. The visual frame serves as protection edge and upper closing. In this way a frame modular system can be put together for all applications in a simple, economical manner.

Abstract: The invention is related to a glass-ceramic article decorated with a ceramic baking finish. A SiO.sub.2 layer, about 20-200 nm thick, is placed between the decoration and the glass-ceramic material. The SiO.sub.2 layer can additionally contain, to match the refractive index to the refractive index of the glass-ceramic, up to 66.5 wt. % of oxides which change the refractive index, in particular TiO.sub.2, ZrO.sub.2, SnO.sub.2, MgO or Al.sub.2 O.sub.3. In the process to produce the decorated glass ceramic article, the SiO.sub.2 layer is preferably produced according to the known sol-gel process. Preferably, an SiO.sub.2 gel layer, optionally precondensed by a brief thermal treatment, is produced on the still-vitreous article. The decoration is applied to this gel layer and afterward the vitreous article is subjected to ceramization. The SiO.sub.2 -gel layer is converted into an SiO.sub.2 layer, and the ceramic color of the decoration is baked-in. The SiO.sub.

Abstract: Temperature sensors or temperature sensor arrangements made from glass ceramic and bonding film resistors, suitable especially for control and limitation of output in glass ceramic cooking areas, are distinguished in that thin- and/or thick-film resistors are baked on supports of glass ceramic, for example, in the area of the cooking zone of a glass ceramic cooking surface, and one or more glass ceramic resistances are delimited and bonded there, and the film resistors form parallel and/or iterative circuits with the glass ceramic resistances. By suitable selection of the dimensions as well as the surface resistances and temperature coefficients of the bonding film resistors and the type of sensor circuit (parallel and/or iterative circuit), the temperature resistance characteristic of a sensor circuit can be varied within wide limits, e.g., the temperature area of use of a glass ceramic sensor can be considerably expanded toward low temperatures.

Abstract: A transparent, colored glass ceramic containing high-quartz solid solution crystals, whose transmission in the IR range between 800 nm and 2.6 microns can be variably adjusted, and which has the composition (in weight percent) of 62-68% SiO.sub.2, 19.5-22.5% Al.sub.2 O.sub.3, 3.0-4.0 Li.sub.2 O, 1.5-3.5% BaO, 0.5-2.5% ZnO and 1.5-5.0% TiO.sub.2 in addition to other possible oxides, which are present in small quantities, the color being produced by MnO.sub.2, Fe.sub.2 O.sub.3, CoO, NiO, V.sub.2 O.sub.5 and Cr.sub.2 O.sub.3.This glass ceramic is transformed from the starting glass by a heat treatment between 680.degree. C. and 920.degree. C.

Abstract: The invention is related to a glass-ceramic article decorated with a ceramic baking finish. A SiO.sub.2 layer, about 20-200 nm thick, is placed between the decoration and the glass-ceramic material. The SiO.sub.2 layer can additionally contain, to match the refractive index to the refractive index of the glass-ceramic, up to 66.5 wt % of oxides which change the refractive index, in particular TiO.sub.2, ZrO.sub.2, SnO.sub.2, MgO or Al.sub.2 O.sub.3. In the process to produce the decorated glass ceramic article, the SiO.sub.2 layer is preferably produced according to the known sol-gel process. Preferably, an SiO.sub.2 gel layer, optionally precondensed by a brief thermal treatment, is produced on the still-vitreous article. The decoration is applied to this gel layer and afterward the vitreous article is subjected to ceramization. The SiO.sub.2 -gel layer is converted into an SiO.sub.2 layer, and the ceramic color of the decoration is baked-in. The SiO.sub.

Abstract: A cooking range with cooking surfaces made of glass-ceramic or comparable material, which has radiating heat elements with at least two heating circuits and suitably fitted control elements. These heating circuits are so arranged, or the heating conductors are so wired or connected by such circuitry, that in the warm-up phase one or more heat conductors are briefly overloaded so that in a very short time they begin to glow and thereby, through translucent cooking surfaces, begin to light up.

Abstract: A cooking panel comprising gas-fired burner units and a continuous cooking surface consisting of glass ceramic or comparable material which is particularly suited for incorporation in kitchen appliances consists of one or two, low-height structural parts in which all main components if the burner units such as combustion chamber, gas mixing chamber, gas mixing means, exhaust gas ducts, warming zones and exhaust gas stack are integrated. These integrated structural parts can be economically manufactured with known wet molding techniques for silicate fiber material--this leading to a weight reduction--and can be built in with a minimum of assembly outlay.

Abstract: A heater or cooker panel assembly comprises an enameled frame having an upper edge which is capped by a decorative edge trim made of alloy steel. The trim protects the upper edge of the frame against damage in use. The frame has an internal flange which mounts a glass or vitreous ceramic hob plate. A layer of silicone adhesive forms a cohesive unit with the frame and trim so that the hob plate is thermally bonded to the unit. A good bond is obtained between the enameled frame and the adhesive. In an embodiment where the frame is plastic coated or is of anodized aluminum, the trim is dispensed with and a substantially U-shaped profile is engaged over the internal flange of the frame. The U-shaped profile is formed of a material which is capable of being firmly bonded to the adhesive.

Abstract: The new frame which is designed for use as a surround for plates (1), particularly for cooker hob plates, consists of two frame profiles of matched, or mutually co-ordinated profile configuration, namely of a mounting frame (2a) which is permanently bonded to the plate, and a sealing frame (6a) which, on the one side, is detachably (7) connected to the mounting frame and, on the other side, is pressed against the plate by means of a permanently elastic adhesive (3,5) or by a rubber sealing profile, as shown by way of example in FIG. 2.

Abstract: A glass-ceramic cooking panel unit of the type having a glass-ceramic plate overlying heating elements is provided with threaded spring mounting connections in the frame. The connections permit adjustments to be made during installation of the unit in the vertical position of the cooking plate relative to the surrounding work surface. The frame design also permits a simplified access to the unit after installation when servicing is required.

Abstract: A vitreous ceramic cooker hob plate with circumferentially surrounding frame permanently elastically adhesively fitted thereto is provided. The circumferentially surrounding frame is adhesively joined to the hob plate in such a way that a narrow gap is left between the bevelled edge of the frame and the hob plate, and the frame flange overlaps the same. The gap is filled in, flush with the frontal side of the bevelled edge, by a permanently elastic adhesive which makes a sealed and mechanically firm joint between the bevelled edge and the hob plate.

Abstract: Fireproof building element with a multi-sheet glazing unit of glass or glass ceramic characterized in that at least one of the glass sheets is a fire resistant glass sheet. The building element contains one or more high heat reflective foils arranged between the sheets at a distance from the fire resistant glazing unit. The foils can be put in a rolled or folded form between the two sheets of the building element such that the visible area is not covered, and they can, in the event of a fire, be spread out completely between the sheets.

Abstract: Gas-heated, glass-ceramic cooking stove incorporating at least one improved gas heated radiation burner subassembly. Each such burner subassembly comprises an infrared radiation burner, a glass, a housing about a burner chamber, a burner plate, a nozzle and mixer pipe, an exhaust gas ring, a waste gas conduit, an igniter, and safety and regulating means. A glass ceramic cover plate is integrally associated with each burner subassembly and serves directly as a cooking surface.

Abstract: A glowing wire type electric lighter or ignition system for a burner assembly in a gas heated stove having a vitreous ceramic cooking plate is provided. The system incorporates a direct warning indication not only that the associated burner assembly is "on" or "off", but also that the heated zone region of the cooking plate over such burner assembly remains too hot to be safely touched after such burner assembly has been switched off until such heated zone region has cooled to a predetermined harmless temperature.

Abstract: An electronic control system monitors, in a gas burner, the four functions of (1) initial ignition of the gas, (2) continued combustion of the gas, (3) the average time rate at which the gas is burned, and (4) the maximum temperature of the combustion chamber. A first comparator is responsive to a first thermosensitive element for controlling the average burning rate (or energy output) and the maximum temperature limit; a second comparator is responsive to a second thermosensitive unit for monitoring the flame of the burner, to sense initial and continued ignition; a third comparator functions as a timedelay circuit in association with the second comparator during an initial ignition procedure; and a fourth comparator controls the source of gas in response to the condition of the first and second comparators, so that gas is supplied only when both safe and necessary.

Abstract: A glass-ceramic plate cooking surface comprises a glass-ceramic base layer which allows penetration of thermal radiation having a wave length of from 0.7 to 5 microns and a top covering layer smaller in thickness than the base layer which is tightly joined to the base layer and absorbs the radiation with wave lengths of 0.7 to 5 microns. The glass-ceramic plate cooking surface can have the heating areas indicated by design and can be provided with an additional layer to avoid asymmetric stress and strengthen the cooking surface.

Abstract: Glass ceramic and the process for producing a dark red glass ceramic comprising the production of basic glass by melting at about 1620.degree. C a mixture of approximate percentages of sand 53.30%, hydrated alumina 27.15%, zirconium silicate 1.90%, titanium oxide 2.02%, lithium carbonate 7.49%, sodium carbonate 0.87%, potash 0.62%, dolomite 0.39%, barium carbonate 1.04%, barium nitrate 2.16%, zinc oxide 1.09%, manganese dioxide 0.56%, ferric oxide 0.21%, cobalt oxide 0.36%, nickel oxide 0.05% and antimony oxide 0.73%. After cooling to about 1480.degree. C, the glass is formed into articles, and the articles further cooled to at least 700.degree. C. The articles are then heat treated to 800.degree. C at about .ltoreq.10.degree. C/min., devitrifying the glass from 800.degree. C to 900.degree. C, at, for example, 0.5.degree. C/min and cooling the article from 890.degree. C to room temperature at, for example, 7.degree. C/min.