baber/WOPTO huggingface dataset:
Patent DD-298700-A5 (DD)
Title: Photovernetzbare silikonkomposition
Inventor: MUELLER UWE
IPC: G03F7/075
Filed: 1988-12-09
Abstract: Die Erfindung betrifft eine photovernetzbare Siliconkomposition, die zur Oberflaechenverguetung, zur Herstellung von Lichtwellenleitern, gedruckten Schaltungen u. ae. geeignet ist. Erfindungsgemaesz wird eine photovernetzbare Siliconkomposition, bestehend aus einem alkenylgruppenhaltigen Polydiorganosiloxan, einem carbonylgruppenhaltigen Photoinitiator und einem Vernetzer verwendet, wobei als Photoinitiator Verbindungen eingesetzt werden, deren Triplett durch einen n,p* oder einen partiellen * gekennzeichnet ist und deren Triplettenergie oberhalb 250 kJmol 1 liegt und als Vernetzer Verbindungen der Formeleingesetzt werden, wobei R1 und R2 unabhaengig voneinander jeweilsH, C1- bis C4-Alkylsowie R3 und R4 unabhaengig voneinander jeweilsC1- bis C4-Alkylbedeuten.{Siliconkomposition, photovernetzbar; Oberflaechenschichten; Polydiorganosiloxan; carbonylgruppenhaltiger Initiator; Alkoxysiloxan}
Patent DD-299524-A5 (DD)
Title: Verfahren und vorrichtung zur herstellung eines verbundwerkstoffes
Inventor: LANGBEIN WINFRIED
IPC: B32B15/14
Filed: 1989-04-03
Abstract: Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Herstellung eines ebenen bandfoermigen faserverstaerkten Aluminium-Verbundwerkstoffes. Das Verfahren besteht darin, dasz eine Schichtung, bestehend aus mindestens zwei Baendern aus einem Aluminiumgrundwerkstoff von 50 m bis 1 mm Dicke, einem Aluminiumlot und mindestens einer Lage organischer oder anorganischer Fasern, die in einer Richtung liegen, von zwei mit Bornitrid beschichteten Baendern abgedeckt wird und in der erfindungsgemaeszen Vorrichtung unter Inertgasatmosphaere und bei einer Temperatur von 10 bis 60 K oberhalb der Schmelztemperatur des Aluminiumlotes und mit einer Walze mit einem Druck von 8 bis 12 MPa fuer eine Zeit von 20 s bis 120 s in Richtung der eingelegten Fasern ueberrollt wird. Durch schrittweises Verdichten der Schichtung wird ein bandfoermiger Verbundwerkstoff hergestellt.{bandfoermiger Verbundwerkstoff; faserverstaerkter Aluminium-Verbundwerkstoff; Schichtung; organische und anorganische Fasern; Bornitrid; Inertgasatmosphaere; Aluminiumlot; Schmelztemperatur}
Patent DD-284942-A5 (DD)
Title: Verfahren zur ermittlung effektiver durchflussquerschnitte
Inventor: FOLLENDORF HANS-MICHAEL
IPC: F02M65/00
Filed: 1989-06-12
Abstract: Die Erfindung betrifft ein Verfahren zur Ermittlung effektiver Durchfluszquerschnitte, vorzugsweise von Einspritzpumpen. Die Aufgabe der Erfindung, ein geeignetes Verfahren zur Ermittlung effektiver Durchfluszquerschnitte von Einspritzpumpen zu ermitteln, mit dem schnell, ohne Einflusz des Stroemungsmediums, bei Messung nur eines Druckwertes, der effektive Durchfluszquerschnitt der Einspritzduese bestimmbar ist, wird dadurch geloest, dasz die zu pruefende Einspritzduese und eine vor- oder nachgeschaltete Stroemungsdrossel mit etwa gleich groszem, bekanntem effektiven Durchfluszquerschnitt vom selben Volumenstrom durchflossen werden und aus dem sich zwischen der Einspritzduese und der Stroemungsdrossel einstellenden Druck der effektive Durchfluszquerschnitt der Einspritzduese ermittelt wird, wobei ein bekannter Eingangsdruck konstant gehalten wird, der Leitungsquerschnitt zwischen der Stroemungsdrossel und der Einspritzduese zur Vernachlaessigung des dynamischen Druckanteils ausreichend grosz ist und der Ausgangsdruck Atmosphaerendruck betraegt.{Durchfluszquerschnitt; Einspritzduese; Volumenstrom; Stroemungsdrossel}
Patent DD-288264-A5 (DD)
Title: Kaltkathoden-elektrode
Inventor: RABUSIN ELIO
IPC: H01J7/14
Filed: 1989-09-08
Abstract: Die Erfindung betrifft eine Kaltkathoden-Elektrode, die ein metallisches Band aufweist, welches ein Quecksilberdampf ausscheidendes Material, vorzugsweise Ti3Hg, gemischt mit einem nicht verdampfungsfaehigen Gettermetall enthaelt, vorzugsweise eine Legierung von 84% Zr und 16% Al, angeordnet in einer kontinuierlichen Reihe von Vertiefungen in dem Band. Die Vertiefungen bilden eine aufeinanderfolgende Reihe von Paaren von Vertiefungen, wobei jede vorzugsweise ovalfoermig ausgebildet ist. Jedes Paar der ovalfoermigen Vertiefungen ist voneinander durch eine Entfernung getrennt, welche groeszer ist als die Entfernung, welche die individuellen ovalfoermigen Vertiefungen voneinander trennt. Das Band kann dann zwischen jedem Paar von Vertiefungen durchgeschnitten werden, um einen schmalen Streifen zu bilden, welcher zwei Vertiefungen aufweist. Ein derartiger schmaler Streifen kann dann in einem Winkel von angenaehert 180 um eine Achse gefaltet werden, die in der Ebene des Bandes in der Mitte zwischen den Vertiefungen liegt, im rechten Winkel zur Bandlaenge. Dieser gefaltete Streifen kann dann an ein Trageelement angeschweiszt werden und als eine Kaltkathoden-Elektrode in einer Miniatur-Leuchtstofflampe Verwendung finden. Die Kathode kann waehrend eines Herstellungsverfahrens aufgeheizt werden, um Quecksilber abzuscheiden und nachfolgend als Kaltkathode und Gettervorrichtung wirken. Fig. 4{Kaltkathoden-Elektrode; Miniatur-Leuchtstofflampe; Band; Material; Quecksilberdampf, ausscheidend; Vertiefungen, ovalfoermig; Paare, durchschneiden, falten; Trageelement}
Patent DD-285003-A5 (DD)
Title: Geschraubte stromschienenverbindung
Inventor: VOGLER JOERG
IPC: H02G5/02
Filed: 1989-09-28
Abstract: Geschraubte Stromschienenverbindung zum platzsparenden Einsatz in elektrischen Schaltanlagen. Die Erfindung loest das Problem dadurch, dasz die Stromschienen im Bereich ihrer Verbindung eine UEberlappung aufweisen, wobei die Stromschienen in diesem Bereich auf die Haelfte ihrer Dicke reduziert sind und eine Verbindung so ohne Etagenbogen oder in einer anderen Ausfuehrung mit nur einem Etagenbogen erfolgt. Fig. 1{Stromschiene; Verbindung; Schaltanlage; Bauweise, platzsparend; Verschraubung; UEberlappung; Etagenbogen}
Patent DD-289962-A5 (DD)
Title: Verfahren und vorrichtung zur reinigung des laeppfilms
Inventor: ENGER ULRICH
IPC: B24B57/00
Filed: 1989-12-13
Abstract: Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Reinigung des Laeppfilms waehrend der Bearbeitung. Die Erfindung wird vorwiegend auf dem Gebiet der Feinstbearbeitung angewendet. Dabei werden eine oder mehrere Vorrichtungen waehrend der Bearbeitung ueber die Laeppscheibe geschoben, die dadurch einen Teil der Suspension in einem Hohlraum aufnehmen und nach Reinigung auf die Laeppscheibe zurueckfuehren. Die Vorrichtung besteht aus einem diamagnetischen verschleiszresistenten Auszenring 3, der einen Permanentmagneten 2 verschiebbar aufnimmt, in dessen Bohrung ein Rohrabschnitt 1 aus diamagnetischem Material eingeschoben ist. Fig. 1{Verfahren; Vorrichtung; Reinigung; Laeppfilm; Laeppscheibe, diamagnetisch; verschleiszfester Auszenring; Paramagnet}
Patent DD-291243-A5 (DD)
Title: Intrauterine empfaengnisverhuetende vorrichtung
Inventor: HAVAS JENOE
IPC: A61F6/14
Filed: 1989-12-29
Abstract: Vorliegende Erfindung bezieht sich auf eine intrauterine empfaengnisverhuetende Vorrichtung, die besteht aus einem aktiven Koerper (2) aus einer metallischen Substanz mit empfaengnisverhuetender Aktivitaet, einem Traegerelement (1) zum Halten des aktiven Koerpers (2) in einer intrauterinen Umgebung. Das Wesen dieser Erfindung besteht darin, dasz der aktive Koerper (2) aus wenigstens zwei Metallen besteht, die eine Vielzahl von galvanischen Zellen in der intrauterinen Umgebung bilden. Fig. 1{empfaengnisverhuetende Vorrichtung; aktiver Koerper; Traegerelement; Metall-Gemische; galvanische Zellen; intrauterine Umgebung}
Patent BE-1000574-A6 (BE)
Title: Preparation a base de cacao.
IPC: A23G1/48
Filed: 1987-05-22
Granted: 1989-02-07
Abstract: La préparation à base de cacao, comportant du chocolat constitué par une masse de cacao, du sucre, du beurre de cacao, de la lécithine et de la vanilline, est caractérisée par une addition de sucre et une incorporation de cannelle. La préparation comporte les étapes suivantes : tempérage du chocolat, addition de sucre, incorporation de la cannelle, moulage.
Patent BE-1006352-A6 (BE)
IPC: C01B15/023
Filed: 1991-12-12
Granted: 1994-08-02
Abstract: Process for the manufacture of hydrogen peroxide by oxidation of alkylanthraquinones (AO process) in which the stage of hydrogenation of the alkylanthraquinones is carried out in the presence of a catalyst containing palladium supported on alumina granules which have been subjected to a halogenation treatment prior to fixing the palladium.
Patent BE-1005654-A6 (BE)
Title: Procede de reproduction d'images.
Inventor: O'TOOLE DAVID
IPC: H04N1/21
Filed: 1993-01-22
Granted: 1993-12-07
Abstract: Un procédé de reproduction d'image est exécuté par un appareillage (1) et comporte le couplage d'images d'une page à réaliser avec des caractéristiques de la page, ainsi que l'enregistrement de ces données à un terminal de données de scanneur (39. On introduit également à un poste de travail (12) des valeurs de paramètres associées. La station de travail (12) traite des signaux corrigés de composantes de teintes selon les valeurs de paramètres et selon des instructions qu'elle a reçues interactivement de l'utilisateur. Les signaux de composantes de teintes traités et corrigés sont mémorisés par le gestionnaire de fichiers (6) dans un fichier situé dans un dispositif de mémorisation active (7, 8, 9). Le gestionnaire de fichiers (6) est également relié à une unité à disques amovibles pour une paire de disques amovibles 816) par l'intermédiaire de bus d'adresses et de données communs. Les disques amovibles sont de type magnétique, si bien que le gestionnaire de fichiers peut communiquer avec eux de la même manière qu'avec les disques (7,8 et 9) du dispositif de mémorisation active. Cette particularité confère de la souplesse à la regénration de films...
Patent BE-1007728-A6 (BE)
Title: Breakwater hull with sliding shield and rolling bridge
IPC: B63B3/48
Filed: 1993-11-29
Granted: 1995-10-10
Abstract: A flat flared hull (7) rounded at the bottom at the ends rising verticallybears shields (2) sliding over its rectilinear and curved surfaces. It isfitted at the front and at the rear with an extendable incurved fin (1) whichregulates pitching. It is provided in its middle part at the bottom with ahatch cover (3) affording access to a careening tank (4) for submarines andwith a rolling bridge (5) making it possible to land easily on a beach.<IMAGE>
Patent ES-2000084-A6 (ES)
Title: Prodn. of (new) phosphonic peptide cpds.
Inventor: LE BRETON MONIQUE
IPC: C07K5/08
Filed: 1986-06-26
Abstract: Peptidyl-amino-alkylphosphonic acids of formula R1NHCH2PO3H2 (Ia) and R2NHCH(Me)PO3H2 (Ib) are new, where: R1 = L-4-fluorophenylalanyl, L-3-nitrotyrosyl, L-4-aminophenylalanyl, L-2,4-dichlorophenylalanyl, L-3,4-dichlorophenylalanyl, L-beta-methyl-phenylalanyl, alpha-methylalanyl, Gly-L-Val, L-Phe-L-Leu, L-Leu-L-Leu, Gly-L-Tyr or L-Ala-sarcosyl R2 = L-3-nitrotyrosyl, L-Ala-L-Leu, sarcosyl-L-Phe, L-Leu-L-Phe, L-Leu-L-Leu, sarcosyl-L-Leu, L-Leu-L-Ala, L-Ala (L-arginine or 2-amino-2-hydroxymethyl-1,3-propanediol salt), Gly-L-Leu, N-acetylglycyl-L-Leu, sarcosyl-L-Tyr, L-Pro-L-Leu or N-benzylglycyl-L-Leu the NHCH(Me)PO3H2 gp. is in the L configuration. - Prods. obtd. by contacting (Ib R2 = L-Ala) with a weakly basic polyamine-phenolic resins, polystyrene sulphonic acid resins and strongly basic polystyrene resins are also new. Prodn. of phosphonic di- or tripeptides (I) with an L configuration is effected by reacting 1 mole of an alpha-amino carboxylic acid or an L-dipeptide formed from two L- or DL-alpha-amino carboxylic acids with at least 2 moles of a DL-alpha-amino phosphonic acid (II) or an L-phosphonic dipeptide formed from (II) and an alpha-amino carboxylic acid. The reaction is effected in an acidic aq. medium at 10-70 deg.C in the presence of papain or chymopapain.
Patent ES-2001240-A6 (ES)
Title: Making bicycle Derailleur gear wheel assembly
Inventor: MONKA EDOUARD
IPC: F16D41/24
Filed: 1986-07-09
Abstract: Derailleur free-wheel gearwheels (9, 10, 11) are each made by a pressing and blanking operation on a metal sheet. Outer gearwheels have pressed-in rims 9, 11, the central wheel being flat. The gearwheels (9, 10, 11) are welded together, the concave rims (91, 111) of the pressings are machined to provide ball races and the edges of the central apertures of the welded gearwheels are cut to provide ratchet teeth for cooperation with a central hub ratchet. More than three wheels can be welded together.
Patent ES-2004037-A6 (ES)
Title: Methods for removing parylene coatings from predetermined, desired areas of a substrate
Inventor: SIMANYI LYDIA H
IPC: B05D3/10
Filed: 1987-01-02
Abstract: Predetermined desired areas of solvent-insoluble parylene coatings are removed from substrates made of materials such as plastics, metals, composites, or ceramics by contacting the areas to be removed with a substance that causes the parylene coating to loosen from the substrate sufficiently to permit physical removal, as by peeling or scraping. The substance used is tetrahydrofuran alone, or in combination with a carrier that does not react with the tetrahydrofuran, the parylene, or the substrate, and that makes the mixture sufficiently viscous for application to desired coating areas without affecting other areas contiguous thereto.
Patent ES-2001827-A6 (ES)
Title: Method and apparatus for biological processing of metal-containing ores.
Inventor: EMMETT ROBERT C
IPC: C22B3/00
Filed: 1987-02-06
Abstract: A bioreactor vessel (13) includes an open-ended tank (14) having suspended therein an air supply means (15) adapted to inject air into a liquid (16). The bottom member (17) is sealingly mounted with sidewalls (18), which has open port (20) and, the sidewalls define a constant tank diameter (21). The supply means (15) may include elongated tubular support shaft (22) which includes a longitudinal axis (24) which passes through the longitudinal axis (26) of the tank (14). Hollow riffle tubes (70) are fixedly mounted to shaft (22) for slurry flow which, after flowing through the riffle tube (70), impacts on the slurry (16) contained in the tank (14). Each radial arm (90), supported by support arm (96), extends outwardly from shaft (22) along longitudinal axis (107) and contains diffusers (100), which directs oxygen to the slurry (16). The diffusers include upright rigid frame structure (104) and a membrane fitted face (106). The membrane adheres to the sidewalls (110) whereby each compartment (114) is sealed. Each compartment (114) contains aperture (115) for measuring CO2 concentrations. Fitted on the lower surface of radial arm (90) are scrapers (117) to collect solids. In one construction, radial arm (90) and support (96) are mounted on cylindrical sleeve (121) which is made rotatable with shaft (22). Positioned in the upper region of the tank (14) is the bridge support (112).
Patent ES-2003683-A6 (ES)
Title: Process for producing gasoline
Inventor: DEBRAS GUY L G
IPC: C10G50/00
Filed: 1987-01-28
Abstract: A process for producing gasoline of improved octane number comprises oligomerising one or more alkenes, and optionally one or more alkanes, having from 2 to 6 carbon atoms over either silicalite (whether stabilized or not) or zeolite, optionally in the presence of water, etherifying the resulting hydrocarbon mixture in the presence of methanol over an acid cation exchange catalyst, extracting the residual methanol with water and distilling the methanol-free etherified effluent.
Patent ES-2005579-A6 (ES)
Title: Method and device for controlling an electromagnet of which the energization by an alternating current causes two parts to come into contact.
Inventor: BATAILLE CHRISTIAN
IPC: H03K17/13
Filed: 1987-05-21
Abstract: The device is used for the control of an electromagnet of which the coil (L) is connected to an alternating current supply source through a switch (T) controlled by a control circuit. Said control circuit comprises a member for determining the zero voltages of the alternating current (R4, C3, D3, IN1, C4, R6, IN2), a delay element adjusted to obtain a delay time which corresponds to the privileged control angle of the electromagnet and a switching device (FL) controlled by the delay element in order to deliver to the switch (T), following a control order, a control signal retarded by said delay time. The invention applies particularly to contactors and to electrovalves.
Patent ES-2012516-A6 (ES)
Title: Process for preparation of an adhesive additive for improving the sizing of paper
Filed: 1987-07-31
Abstract: Process for the preparation of an adhesive additive which comprises reacting a derivative of succinic anhydride of formula I in which R is a hydrophobic group which incorporates a quantity of between 0.1 and 15% of the product of the reaction of the succinic derivative with a polyalkylene glycol of formula II, the reaction being performed at a temperature of between 25 and 150 degree C for 1- 150 minutes. The portion between the two components is between 0.01 to 10% of polyglycol and 99.95 to 80% of the anhydride derivative. In the reaction process all the hydroxyl groups are converted into ester groups. The adhesive additive is used in the form of an aqueous emulsion in a concentration of 0.01 to 3% with respect to the fibres and dry fillers.
Patent ES-2008242-A6 (ES)
Title: Self-gradually locking chuck
Inventor: BASTIANI GIOVANNI
IPC: B23B31/22
Filed: 1987-09-29
Abstract: A self-gradually locking chuck for drills or similar devices particularly suitable for portable drills used in surgery. It includes a cylindrical sleeve which can be coaxially fixed to a rotating shaft, a ferrule having a conical section provided internally with lobes, a cylindrical portion at one of its ends for engagement with said sleeve and a cylindrical portion at the other end. A first mounting, perforated longitudinally by a hole, includes a central portion having locking jaws which are movable in holes in a direction convergent upon the axis of the chuck and two second mountings opposite to the central body. A spring and centering device are provided. A cylindrical ferrule is threaded to a part of the first mounting as it projects from the first-mentioned ferrule. The first mounting and ferrule move axially in relation to each other and in relation to the cylindrical sleeve in which the ferrule can be releasably secured to the cylindrical ferrule by a retaining device. The second mountings are releasably secured to the sleeve by a retaining device.
Patent ES-2013161-A6 (ES)
Title: Nozzle for atomizing liquid media, in particular a fan-jet nozzle
Inventor: LECHLER WALTER H
IPC: B05B1/04
Filed: 1989-04-11
Abstract: A nozzle for atomizing liquid media, in particular a fan-jet nozzle, comprising a nozzle housing determining by its external dimensions and its fitting means the particular nozzle type, and a nozzle internal structure enclosed by the nozzle housing in turn determining the nozzle type functionally, both the nozzle housing and the nozzle inner structure being made of the same material. The nozzle housing on one hand and on the other the nozzle inner structure (nozzle inset) are separate integral parts, and the nozzle inset is force-fitted in undetachable manner into the nozzle housing. Such separate manufacture of the nozzle housing on one hand and on the other the nozzle inset determining the nozzle inner geometry (functional geometry) allows improving applicability and storage costs while simultaneously lowering the manufacturing and storage costs of said nozzle.
Patent ES-2014366-A6 (ES)
Title: Thermogravitational machine
IPC: F03G7/06
Filed: 1989-07-12
Abstract: Thermogravitational machine intended for the production of energy, which in its definition is a thermodynamic system whose fluid absorbs heat and by means of this runs through a cycle whereby work is obtained. It consists of two adiabatic systems, one with a heater and the other with a cooler and, owing to the difference in density and via two conduits, an upper conduit and another, lower conduit, which place the two systems in communication, a flow is produced in which work is obtained. Novel machine, because the work is not produced by the difference in volume but by the difference in density of two systems. Processes or techniques available can be applied equally to both the heater and to the cooler in this system.
Patent ES-2019523-A6 (ES)
Title: Two-sided knitted fabric and garment made with said fabric
IPC: D03D15/00
Filed: 1989-12-15
Abstract: The fabric 7 comprises two sides formed by two independent threads 3, 4 woven simultaneously so that they are arranged one beside the other, forming parallel meshes. One of the threads 3 is of synthetic fibre and the other 4 is made from cotton, thereby forming a fabric 7 with a synthetic-fibre side and another, cotton side. The invention also relates to a garment made with the aforesaid fabric 7. A sweat-absorbent and heat-insulating garment is achieved.
Patent ES-2029179-A6 (ES)
Title: Addition to main patent No. 8902719/1 for vessel for washing machine
Inventor: GRACIA BOVED ISMAEL
IPC: D06F39/12
Filed: 1991-01-24
Abstract: The improvements relate to the lid of the vessel and to the counterweight, the counterweight lid 1 consisting of a piece 2 equipped with ribs 3, towards the outside of the vessel, for filling with concrete 4, the piece 2 having a perimeter flange 5 for its fastening to the band of the vessel.
Patent ES-2029431-A6 (ES)
Title: Device for rolling hoses, cable, and similar elongated elements
IPC: B65H75/42
Filed: 1991-03-26
Abstract: It is composed of a metal ring equipped with radii, mounted on a horizontal axis that has welded a toothed plate geared by means of chains, on a second plate mounted on the rotation axis of the ring activation lever. The set is installed in a motorised or manual means of transportation. To facilitate the rolling of the hose, the ring has some slightly inclined piston rods welded on to its radii, which during the manoeuvre for extending the hose, assist in the unrolling of the same. The device is appropriate for sprinkler hoses, electric cables, ropes, and similar elements.
Patent FR-2050564-A7 (FR)
Title: Portable bath for inducing perspiration
IPC: A61H33/06
Filed: 1969-06-20
Granted: 1971-04-02
Abstract: Bath is formed from a flexible rectangular sheet into a cylinder and closed by a sliding fastener along a generatrix. The exterior is covered with a cushion formed from two films of PVC enclosing a layer of polyester foam, and bonded to the sheet with adhesive. The films are bonded together at intervals by sewing or welding and pref. are non-inflammable, odour-free and rot-proof. The plastic bath is more comfortable, flexible and lighter.
Patent FR-2282773-A7 (FR)
Title: Cardboard display package for fruit - has precut line around area removable to form package into tray
IPC: B65D5/54
Filed: 1974-08-23
Granted: 1976-03-19
Abstract: Made from cardboard in one piece, the blank comprises a base (1) with two long sides (7, 8). At one end is a short side (3) with a tab (6) each end. The side (3) is joined to the top which is also provided with two long sides (9, 10) and which is terminated by the remaining short side (4), with tabs and a tongue (5). To erect the box, this tongue is glued to the base and the side tabs are folded in; all long sides are folded in and each pair glued together, after filling with fruit. To display the contents, an area (2) on the top face and partway down each side is removed.
Patent FR-2400822-A7 (FR)
Title: Dishwasher with automatically cleaned fine filter sieve - has fresh water supply flowing up through sieve to remove deposits
IPC: A47L15/42
Filed: 1978-08-17
Granted: 1979-03-16
Abstract: The dishwasher machine contains a fine sieve (7) mounted above the drainage trough and is automatically cleaned by the fresh water which is fed in through the supply pipe (12) mounted in a chamber, depression or the like beneath the fine sieve (7). As the fresh water is supplied any deposits on the fine sieve are washed away into the emptying system from where they are either pumped off immediately through the emptying pump which can be temporarily switched on or pumped away later during the next change of water. The supply pipe (12) is pref. mounted beneath the highest point of the funnel-shaped sieve.