baber/WOPTO huggingface dataset:
Patent WO-2004093718-A1 (WO)
Inventor: FISCHER FRANZ
IPC: A61C17/22
Filed: 2003-04-22
Abstract: The invention relates to a brush head (3) for an electric toothbrush, comprising a bristle support (4) within which bristles (5, 6) that are set in motion during operation of the electric toothbrush are anchored. According to the invention, the bristles represent at least partly pointed filaments (5) which are disposed on the bristle support (4) in such a way that the tips (5a) thereof cover no more than a predetermined maximum distance dmax, whereby a toothbrush having an improved brushing effect especially in the interdental spaces and on the minimal structures located on the tooth surface is provided in an advantageous manner while the mechanical stress and thus the wear of the pointed filaments (5) is minimized. The invention further relates to an electric toothbrush and a production method with or for such a brush head (3).
Patent CH-704610-A1 (CH)
Inventor: KELLER ERNST
IPC: E05B27/00
Filed: 2011-03-01
Abstract: Der Drehschliesszylinder besitzt ein Zylindergehäuse (2) und einen Zylinderkern (3) sowie Zuhaltungen, die jeweils einen Kernstift (6) und einen Gehäusestift (5) aufweisen. Die Zuhaltungen sind in Bohrungen (7, 8, 14) des Zylindergehäuses (2) und des Zylinderkerns (3) geführt und können durch einen in einen Schlüsselkanal (9) eingeführten Schlüssel eingeordnet werden. Der Zylinderkern (3) weist an seiner Aussenseite (10) wenigstens eine Einlage (11) auf, die im Querschnitt ein Segment des Zylinderkerns (3) bildet. Die Einlage (11) ist aus einem Material hergestellt, das wesentlich härter ist als Messing. Die Einlage (11) ist vorzugsweise schwimmend gelagert. Der Zylinderkern (3) kann auch dann nicht mit einem unberechtigten Schlüssel rotiert werden, wenn dieser lediglich mit einem einzigen Stufensprung negativ gesperrt ist.
Patent WO-8705542-A1 (WO)
Title: Large surface-area sifter comprising two sifting boxes
Inventor: KELLER ALOIS
IPC: B07B1/42
Filed: 1987-03-10
Abstract: A large surface-area sifter (1) comprising two adjacent boxes (2, 3) operated by crank-shafts (15) in such a way as to affect opposed-phase circular oscillation. For this purpuse, each box (2, 3) is suspended or supported by oscillating components (4, 5) and operated by at least two cranks (10). In this way it is possible to obtain also a clear-cut circular oscillation when the load of product is located on only one side, by placing a balancing weight (22) on each crank (10) and locating the drive between the two boxes (2, 3) in the region of the two outermost sides.
Patent WO-9950159-A1 (WO)
Inventor: KRAFT MARKUS
IPC: B65G15/42
Filed: 1999-03-17
Abstract: L'invention concerne un transporteur à courroie (1) à surface profilée (10) pour le transport de marchandises pouvant rouler. La surface (10) du transporteur à courroie présente plusieurs nervures (11) continues, ondulées dans le sens longitudinal et ne se touchant pas. L'agencement des nervures (11) selon l'invention évite les points d'intersection; ainsi, le transporteur à courroie (1) est plus souple et tend moins que les transporteurs à courroie traditionnels aux imperfections et aux défauts dus à de tels points d'intersection.
Patent WO-9952066-A1 (WO)
Title: Verfahren zum laden von daten auf chipkarten und entsprechend angepasste vorrichtungen
Inventor: RITTER RUDOLF
IPC: G06Q20/00
Filed: 1999-03-30
Abstract: Verfahren zum Laden von Daten auf Chipkarten (2), in welchem Daten von einem Dienstzentrum (6) über ein Mobilnetz (4) auf eine SIM-Karte (1), welche in ein Mobilgerät (3) eingeführt ist und mit diesem über eine kontaktbehaftete Schnittstelle verbunden ist, übertragen und dort gespeichert werden, und in welchem diese gespeicherten Daten von der SIM-Karte (1) kontaktlos auf eine kontaktbehaftete Chipkarte (2) übertragen werden. Zum Beispiel ist das Mobilgerät (3) ein Mobilfunktelefon und das Mobilnetz (4) ein GSM- oder UMTS-Netz. Vorzugsweise geschehen diese Übertragungen gesichert und authentifiziert.
Patent WO-9936521-A1 (WO)
Title: Gene homologue a la proteine acromosique du sperme d'un renard fsa-1 (cbcald05)
Inventor: MAO MAO
IPC: C12N15/12
Filed: 1998-01-19
Abstract: L'invention concerne des polypeptides et des polynucléotides CBCALD05 et des procédés d'obtention de ces polypeptides par des techniques recombinantes. Font aussi l'objet de cette invention des procédés d'utilisation des polypeptides et des polynucléotides CBCALD05 dans la conception de protocoles pour le traitement de la stérilité et de maladies liées à la fécondité, entre autres, et des doses diagnostiques pour ces pathologies.
Patent CU-21974-A1 (CU)
Inventor: CORRALES BARIOS LUIS BENIGNO
IPC: H01H83/14
Filed: 1988-09-21
Abstract: La invención se relaciona con la rama de la Electrotécnia y específicamente, es un relé para la protección de barras de energía eléctrica del sistema electroenergético. El principio de operación se basa en la comparación de las amplitudes de las senales provenientes de las líneas que salen de las barras; el relé opera cuando la suma instantánea de dichas amplitudes es mayor que el valor de ajuste de la pendiente del relé. El circuito presenta inhibición por voltaje, lo que lo hace más selectivo. Para la comparación de las amplitudes se utiliza un circuito detector de nivel que compara senales de cualquier forma de onda y es inmune a los ruidos. Presenta ventajas con respecto a otros relés como son mayor selectividad, menor costo, mayor rapidez de operación, menor consumo de energía, menor volumen y peso, senalización mas sencilla, baja carga para los transformadores de corriente y potencial y posibilidades de proteger con un sólo relé más de tres líneas.
Patent WO-0106479-A1 (WO)
Title: Navigationsverfahren für ein fortbewegungsmittel
Inventor: VON GERLACH BJOERN
IPC: G08G1/0968
Filed: 2000-07-14
Abstract: Die vorliegende Erfindung betrifft ein Navigationsverfahren für ein Fortbewegungsmittel, insbesondere für ein Fahrzeug, Kraftfahrzeug, Schiff oder Flugzeug, zur Navigation von einem Ausgangsort zu einem Zielort, wobei eine Route von dem Ausgangsort zu dem Zielort bestimmt und das Fortbewegungsmittel bzw. dessen Benutzer entlang dieser Route geführt wird. Hierbei wird bei Verlassen der bestimmten Route vor Erreichen des Zielortes die gefahrene Strecke wenigstens bis zum wieder Eintritt in die bestimmte Route bzw. bis zum Erreichen des Zielortes aufgezeichnet, gespeichert und bei späterer Anforderung einer Route mit demselben Ausgangsort und Zielort die gespeicherte Strecke als Route bzw. entsprechender Routenteil, welche einen ursprünglich vorgeschlagenen Routenteil ersetzt, vorgeschlagen.
Patent WO-0118321-A1 (WO)
Inventor: NASS RUEDIGER
IPC: C03C25/002
Filed: 2000-09-01
Abstract: Beschrieben wird ein flächig Witterung ausgesetzter, verbaubarer Körper, insbesondere mit glatter, poröser und/oder mikrostrukturierter Oberfläche, wie ein Klinker, Dachziegel oder eine Schindel. Um diese vor Moosbefall zu schützen, soll eine Beschichtung vorgesehen sein, die stärker wasser- und/oder schmutzabweisende Eigenschaften besitzt als der Körper selbst.
Patent WO-0214879-A1 (WO)
Title: Schaltungsanordnung zum erfassen eines stroms durch einen verbraucher
Inventor: WENGER CHRISTOPH
IPC: G01R15/18
Filed: 2001-08-10
Abstract: Eine Schaltunganordnung zum Erfassen eines Stroms durch einen Verbraucher (16), welcher zwischen den Ausgängen (14c, 15c) von zwei Verstärkern (14, 15) angeordnet ist, welche zur Versorgung mit einer unipolaren Betriebsspannung VCC jeweils einen Versorgungsspannungsanchluss (14a, 15a) und einen Masseanschluss (14b, 15b) haben, ist dadurch gekennzeichnet, dass zwichen dem Anschluss (18a) der Betriebsspannungsquelle und dem Versorgungsanschluss (14a, 15a) und/oder zwischen dem Masseanschluss (14b, 15b) und der Masse (18b) ein Bürdenwiderstand (17) geschaltet ist, an dem eine dem zu erfassenden Strom proportionale Spannung UA abfällt.
Patent WO-0232637-A1 (WO)
IPC: B02C21/00
Filed: 2001-10-17
Abstract: A unit for the processing of scrap rubber and scrap rubber products, by means of cryogenic milling, comprising cooling tunnels for the supercooling of the feedstuff for milling, contaminant removers and milling devices for the deeply chilled feedstuff. A multi-stage pre-milling is provided by means of milling units (17, 17a). The pre-milled feedstuff is fed through supercooling units, divided into several cooling zones, in which the feedstuff may be sprayed with a liquid deep-chilling agent. The supercooling units are arranged in series with a compensation system. The supercooled feedstuff is subsequently finely milled in multi-stage fine milling units in a stepwise manner.
Patent WO-02084809-A1 (WO)
Title: Kontaktstück für eine elektrische steckverbindung
Inventor: SCHWEIZER MATTHIAS
IPC: H01R13/436
Filed: 2002-04-04
Abstract: Ein leitfähiges Kontaktstück (1) für eine lösbare elektrische Steckverbindung mit einem Isolierkörper (2), der eine sich in Steckrichtung (S) erstreckende Bohrung (23) aufweist, wobei das Kontaktstück (1) in die Bohrung (23) einführbar ist und eine Verriegelungskante (16) aufweist, die zum Verriegeln des eingeführten Kontaktstückes (1) mit einer am Isolierkörper (2) angeordneten Rückführsperre (25) zusammenwirkt, welches eine erste Verriegelungskante (16) und eine dazu versetzt angeordnete zweite Verriegelungskante (18) aufweist, die zum alternativen Verriegeln des Kontaktstückes (1) in einer zweiten Steckverbindung mit einem eine zweite Bohrung (23') aufweisenden zweiten Isolierkörpers (2') vorgesehen ist, der eine entsprechend versetzt angeordnete zweite Rückführsperre (25') aufweist, ist nicht nur in einem einzigen speziell konfektionierten Isolierkörper, sondern in mehreren elektrischen Steckverbindungen mit unterschiedlichen Isolierkörpern einsetzbar.
Patent WO-03081016-A1 (WO)
Inventor: SCHMIDT THOMAS
IPC: F02M37/10
Filed: 2003-03-17
Abstract: L'invention concerne un connecteur (7) pour pompe à carburant, destiné à maintenir des contacts électriques (6). Ce connecteur, qui est fabriqué à partir d'un matériau capable de gonfler avec le carburant, est inséré dans un logement (12) d'un raccord (4) à l'aide d'un ajustement. Le connecteur (7) et le raccord (4) présentent également des moyens d'encliquetage (11) destinés à simplifier le montage préalable. Ce raccord (4) nécessite un nombre particulièrement faible de composants et peut être fabriqué de façon économique.
Patent WO-2005053376-A1 (WO)
Inventor: WAGNER JUERGEN
IPC: A01C11/02
Filed: 2003-11-28
Abstract: The invention relates to an attachment for a three-point planting device for planting in parallel rows, in particular for viticulture, in order to place seedlings, optionally together with plant supports, in a furrow that has been previously cut by a ploughshare. Said device comprises: a planting frame (1) for the three-point fixation and a chassis (2), which supports the mechanical planting unit (3) and the central wedge-shaped ploughshare (4) that is open to the rear; and a unit for maintaining the chassis in a horizontal position on sloping ground (2) in order to achieve the perpendicular planting of the seedlings and optionally the plant supports, said unit having height-adjustable wheeled legs (5a, 5b) equipped with support wheels (51a, 51b) to enable the distance between the chassis or ploughshare and the planting surface to be adjusted. Said wheeled legs are connected to the unit by means of carriage-type support-wheel bearing elements (52a, 52b), which run preferably in guides. The height of the bearing elements can in turn be adjusted in relation to the planting frame (1) and said elements are respectively supported on one of the two lower suspension arms of the three-point planting device.
Patent DE-1812523-A1 (DE)
Title: Purification of adiponitrile
Inventor: ANTON WEGERICH DR
Filed: 1968-12-04
Abstract: Crude adiponitrile is extracted with a liquid alcohol of at least 4 carbon atoms, e.g. n-amyl alcohol or 2-ethyl-hexanol-(1), the two phases formed are separated and each phase treated, e.g. by crystallisation, distillation, etc. to recover adiponitrile.
Patent DE-1901003-A1 (DE)
Title: Prodn of webs and paper-like sheets using fibres prep
Inventor: SENGER DR FRANZ
IPC: D01D5/42
Filed: 1969-01-09
Abstract: Opt. bonded plastic fibre material made by (a) stretching plastic films in an aqs. suspense. and mechanically splitting them into short segments (corresp. to desired fibre-lengths) which are mechanically sepd. into fibres and dried after removal from the liq.; (b) processing the fibres (in aqs. suspense.) into webs and/or paper-like sheets in the conventional paper-making manner. Plastic fibres are stretched to near breaking point to the lengthwise direction to increase their stiffness and strength by molec. re-orientation, the strength across that direction becoming pract. nil. The material is then treated as above.
Patent DE-1901492-A1 (DE)
Title: Monolithic 2-component large refractory - blocks/bricks
Inventor: SCHNUCH JOSEF
IPC: C04B35/66
Filed: 1969-01-14
Abstract: Core and boundary zones towards fire side and periphery are of 2 different refractory materials, monolithically joined. Pref., the boundary zones towards the periphery are of a material of low thermal conductivity and thereby a deformation of the metal furnace jacket is prevented.
Patent DE-1923569-A1 (DE)
Title: Benzoxazine and benzothiazine derivs cns depressants
Inventor: KRAPCHO JOHN
IPC: F16C29/04
Filed: 1969-05-08
Abstract: Compounds of general formula:- (I) and salts thereof. Ar = (X')n-substd. aryl (aryl includes furyl, naphthyl, thienyl, pyridyl) R = H, alkyl, (X2)n-substd. aryl R', R" = H or together form =O Y = O, S, SO, SO2 X, X', X2 = same or different H, alkyl, alkoxy, NH2, dialkylamino, halo, alkylthio, OH, CN, NO2, CF3 n = 1-3; r = 0-3 A = alkylene Q = OH or B where B= a basic N-containing radical, e.g. NH2, alkylamino, dialkylamino, hydroxyalkylamino, di(hydroxy-alkyl)amino, phenylalkylamino, or a saturated N-containing heterocyclic ring having 5-7 ring atoms including an optional additional hetero atom CNS depressants, tranquillisers, antibacterials. 2,3-dihydro-3-(3-hydroxypropyl)-2-phenyl-4H-1, 3-benzothiazin-4-one, m.p. 124-126 deg.C.
Patent DE-1936611-A1 (DE)
Title: Heating strip for welding plastics
Inventor: ULF KRIEBEL DIPL-ING
IPC: B29C65/00
Filed: 1969-07-18
Abstract: Especially a ridged beating strip is used for welding of thermoplastic sheets. The strip has two joining and one separation zones. The separating feature is a sharp ridge between two flat parts. This heater strip is pressed against a heat resistant, flexible pad during operation. Temperature drop across the width of the strip is achieved by using material of high electrical conductivity for the ridge and material of lower electrical conductivity for joining zones.
Patent DE-1940439-A1 (DE)
Title: Manufacture of fashioned knitted panels for the - production of fully fashioned clothing
Inventor: ARCHER-PRIEUR MARIE-ANTOINETTE
IPC: D04B1/24
Filed: 1969-08-08
Abstract: Continuous operation, eliminating curled edges, poor appearance of hems; panels show reductions and extensions identical to those found in fully fashioned clothing and the output is in the form of knitted continuous strip. The continuous strip is first knitted and fully fashioned panels contours as required. The panels are cut from the continuous strip and sewn together. Contour is obtained on the cotton machine by the inclusion of two reduction plates, the standard punches giving the panel its shape which will be followed during cutting. Once the panel is finished a loose row or marking thread can be incorporated to locate the point of separation from the strip.
Patent DE-1954242-A1 (DE)
Title: Extrusion press for the processing of therm- - oplastic or non-interplaced elastomer
Inventor: UPMEIER HARTDUT DIPL-ING
IPC: B29C48/03
Filed: 1969-10-28
Abstract: A mixing unit for the equalising of different material temps. in the extruded material is positioned in the supply channel of the treatment tool. The unit consists of a body, which extends over the complete cross section of the channel, having a number of passage channels for the material. These run transversely to the supply channel, cutting the axial centre plans of the body. Heat exchange 'windows' are formed at the crossing points of the walls separating the channels. Here the material flows are separated by heat conducting intermediate walls, which are thin when compared with the separating walls.
Patent DE-1964793-A1 (DE)
Title: 2,3-diamino-s-triazin-6-ylcarboxylic acid - prepn
Inventor: BRUENING JUERGEN DR DIPL-CHEM
IPC: F21S8/02
Filed: 1969-12-24
Abstract: The title cpd., an antiviral pharmaceutical is prepd by oxiding 2,4-diamino-6-methyl-s-triazine with alkali permanganate, pref. K permanganate, in known manner. The process can be carried out on a technical scale.
Patent DE-1966316-A1 (DE)
Title: 1,7- bis-(epoxy butyl)-neocarborane - used in mfr of adhesive compsns
Inventor: L BARNES ROBERT
IPC: C08G59/30
Filed: 1969-09-25
Abstract: (I) is claimed. The (I) may be hardened to form a solid, using catalysts and/or reactive hardening agents (II). Used in mfr. of adhesive compsns. The (II) may be 4,4'-diamino-diphenyl-sulphone.
Patent DE-2014036-A1 (DE)
Title: Adhering glass fibre fabric to moist substra
IPC: C09J195/00
Filed: 1970-03-24
Abstract: The adhesive consists of a mixture of bitumen emulsion with a rubber latex emulsion. It is used to stick perforated non-woven glass fabric to moist substrates such as concrete floor, by coating the fabric so that the adhesive penetrates through the holes and stricks to the floor. Formation of fine pores in the adhesive layer by volatilisation of moisture when a hot bitumen material is used, is avoided. Adequate adhesion is obtained on steep surfaces and slipping of te fabric is prevented.
Patent DE-2014881-A1 (DE)
Title: Glass metallisation materials
IPC: C03C3/066
Filed: 1970-03-26
Abstract: The metallization material is roasted in air or in an inert atmosphere on a dielectric substrate. This forms an electrically conductive, solderable and adhesive film. The material contains (% by wt.) of fine-particle size precious metal or metals and 2-30% by wt. of fine particle size inorganic binder consisting of a glass of (% by wt.), ZnO 24-34; B2O3 22-30; SiO2 18-25; Na2O 2-10; Al2O3 3-7; ZrO2 2-6; CaO 0-5; Ba0 0-2; PbO 0-1; K2O 0-4.
Patent DE-2041477-A1 (DE)
Title: Adhesive for polyolefin - from polystyrene solvent benzoyl peroxide, tert amine and benzoic acid
Inventor: POPESCU CONSTANTIN
IPC: C09J4/06
Filed: 1970-08-20
Abstract: The adhesive is prepd. from a soln. of 15 - 35 pbw polymerisate in 55 - 75 pbw. active solent an an accelerator-activator pair of 8-14 pbw. benzoyl peroxide-tert. amine and 1.5 - 2 pts. benzoic acid (based on the peroxide only). The amine and benzoic acid are added to a homogeneous mixture of polymerisate and solvent, at 20 degrees C with stirring, in that order and the benzoyl peroxide is added just before the adhesive is to be used. The polymerisate is pref. polystyrene, dissolved in acrylonitrile monomer, DVB or methylmethacrylate. No heat is needed for adhesion and no pre-treatment of the surfaces. Polyolefin/polyolefin and polyolefin/steel or aluminium surfaces can be cohered.
Patent DE-2051387-A1 (DE)
Title: Lactam synthesis - involving traces of halogens/hydrogen halides
IPC: C07D201/04
Filed: 1970-10-20
Abstract: In the prodn. of lactams by rearrangement of oximes with dil. H2SO4, the reaction may be made milder when traces of a halogen, e.g. I2, or H Hal are present. In an example 1 mol. cyclohexanone oxime was reacted at -15 to -30 degrees C with 0.3% H2SO4 and 0.01% Cl2.
Patent DE-2063128-A1 (DE)
Title: Hydrolysis of plant phosphatides to phospha - tide emulsifiers
IPC: C07F9/10
Filed: 1970-12-22
Abstract: Phosphatide emulsifiers for oil/water or water/oil emulsions in foodstuffs, cosmetics and pharmaceutical prepns. are prepared by partial hydrolysis of natural or modified plant phosphatides or plant oils containing these at a pH of 3-5 and a temp. of 50-100 degrees C with SO2 gas or aqueous solution, or (NH4)2SO3, to give a lyso phosphatide yield of 30-40%. pH is maintained by (NH4)2SO3 or formic acid. The product is purified by vaccum evaporation.
Patent DE-2104920-A1 (DE)
Title: Wood coating machine
IPC: B05C1/02
Filed: 1971-02-03
Abstract: Wood is coated with synthetic mixtures applied and smoothed by rollers. The applicator is fitted with a reciprocating transfer scoop to prevent build-up of mixture and the film thickness is controlled.
Patent DE-2107777-A1 (DE)
Title: Horizontal continuous casting - with casting units mounted on an oscillating casting bogie
IPC: B22D11/14
Filed: 1971-02-18
Abstract: Designed for the high-speed casting of non-ferrous metal sin hollow profiles, the oscillation of the casting bogie gives a movement on the continuously cast metal in the direction of the length of the ingot mould. Together with cooling jackets, and secondary cooling units, the purpose is to provide a high-speed continuous casting where the metal can be passed directly into subsequent handling operations, such as a rolling mill.
Patent DE-2109985-A1 (DE)
Title: Air purifier - for vehicle ventilating system
IPC: A61L9/01
Filed: 1971-03-03
Abstract: The air purifying system consists of a number of large surface area filters e.g. cellulose layers, activated carbon, opt. with chemical catalysts and metal oxide. The adsorption capacity of the carbon is =40% wt. and the pore size of the granules is 1.7-2.5 mm.
Patent DE-2113523-A1 (DE)
Title: Ejector mechanism - for tablets produced by pressing powder in a revolving press
Inventor: KORSCH GUENTER
IPC: B30B15/32
Filed: 1971-03-17
Abstract: A rotary drive ejection roll with >=1 ejector cam on it works synchronously with the matrix table and is arranged behind the lower presser roll in the direction of rotation of the table and with an intermediate plate, which serves to guide the die shaft, bridging the gap between the two rollers.
Patent DE-2127262-A1 (DE)
Title: Unsatd cyclic isocyanide dichlorides - useful as polyurethane inters
IPC: C08G18/77
Filed: 1971-06-02
Abstract: Cpds of formula (I) (where R, R1 and R2 are H, halogen or aliphatic or aromatic gps; R3-R are H, Cl or lower alkyl, or one of R3-R8 can be phenyl, or R3 and R together can form CH2 or CH2CH2) are inters for the corresp. bis-isocyanide dichlorides, which can be converted into polyurethanes useful as light and weather-resisting coating masses, and highly chlorinated (I) can be converted into flame-proof plastics. Cpds. (I) may be prepd. by reacting Cl2C=N-CR=CR1R2 with R3R4C=CR5-CR6=CR7R8 at 50-300 degrees C, pref in the presence of a Friedel-Crafts catalyst.
Patent DE-2140268-A1 (DE)
Title: Low pressure die casting slab dies - have machined graphite lining
Inventor: KARABEK YASAR DIPL ING
IPC: B22D18/04
Filed: 1971-08-11
Abstract: The casting die for large smooth walled castings such as slabs comprises an inner lining subject to wear consisting of graphite and an outer permanent layer, which join parallel or nearly so in relation to the outer surfaces of the die and are interconnected to permit heat transmission between the two. The die components are pref. assembled by being pressed against each other by outer clamps. The die design permits the assembly of an accurately assembled mould from components, which have been subjected to simple machining operations and can be easily remachined if required.
Patent DE-2145247-A1 (DE)
Title: Slag blowing furnace fuel injector - with pre-combustion chamber
Inventor: MEGERLE FRIEDRICH
IPC: F27B3/20
Filed: 1971-09-10
Abstract: In furnaces, where hot gases are introduced below melt level, the hot gases are produced by at least partial combustion of the liq. or gaseous fuel prior to its injection into the furnace. The cylindrical burner comprises pref. an inner combustion chamber with a surrounding secondary air chamber with concentric nozzles into the furnace. The method ensures a continuous flame, thereby avoiding slag solidification during melting. The method is used, e.g. for de-tinning of Sn holding slag.