baber/WOPTO huggingface dataset:
Patent SG-11201903181U-A (SG)
Title: Multi-component mortar system
Inventor: SAUTREUIL DORINE
IPC: B33Y70/00
Filed: 2017-10-26
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property MD 1101111 0 DOI HIM 011101 0 01111111 1111111111111111111111111111111111 Organization 0 International Bureau (10) International Publication Number (43) International Publication Date .....0\"\" WO 2018/083010 Al 11 May 2018 (11.05.2018) WIPO I PCT (51) International Patent Classification: B28B 1/00 (2006.01) B33Y 70/00 (2015.01) C04B 28/06 (2006.01) (21) International Application Number: PCT/EP2017/077516 (22) International Filing Date: 26 October 2017 (26.10.2017) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 16196754.2 01 November 2016 (01.11.2016) EP (71) Applicant: SIKA TECHNOLOGY AG [CH/CH]; Zuger- strasse 50, 6340 Baar (CH). (72) Inventors: SAUTREUIL, Dorine; 1 Hameau Ecultot, 76280 Gonneville la Mallet (FR). LIARD, Maxime; 7 Croisee des Lys, 68300 Saint-Louis (FR). HERR, Olivier; 6, rue des Hayes les Flamands, 76220 Neuf-Marche (FR). CADER, Mohamed; 30 Forest Avenue, Cranford, New Jersey 07016 (US). LOOTENS, Didier; Grundwiesstrasse 2, 8700 Kiissnacht (CH). LEGRAIN, Anne-Claire; 906 Willow Ave, Apt. 7, Hoboken, New Jersey 07030 (US). Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (81) = Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). (84) 1-1 , 1 Published: with international search report (Art. 21(3)) 0 Il 0 en pc (54) Title: MULTI-COMPONENT MORTAR SYSTEM ---- (57) : The present invention relates to a multi-component mortar system comprising a component A and a component B GC ,_ 1 wherein - component A comprises aluminous cement, at least one set inhibitor, at least one mineral filler and water, and - component B 0 comprises an initiator system for the set-inhibited aluminous cement, at least one mineral filler and water. The multi-component mortar N system is easy to use and suitable for repair and refurbishment and particularly for printing 3D structures. C
Patent AT-401812-B (AT)
IPC: F24D3/14
Filed: 1990-03-07
Granted: 1996-12-27
Abstract: In a floor-heating system for suspended floors, there are arranged between the flooring joists (4) at a lateral distance (13) from these, two-layer floor-heating elements (6, 7), the lower layer (6) of which is elastically compressible. The leaves (11) of heat-distributing elements (9) bear flat against both the floor-heating elements (6, 7) and the false floor (2). During assembly of the floor heating system, the floor-heating elements (6, 7) and the leaves (11) of the heat-distributing elements (9) arranged thereon project, before fastening of the false floor (2) to the flooring joists (4), upwardly above these and are only pressed downwards by the fastening of the false floor (2). As a result, flat contact of the leaves (11) against the underside of the false floor (2) or of a polyethylene film provided there is guaranteed. <IMAGE>
Patent AT-397948-B (AT)
Title: Run-up ramp for a low loader
IPC: B60P1/43
Filed: 1990-04-03
Granted: 1994-08-25
Abstract: In order to obtain, for the run-up ramp 1 of a low loader 2 which has a main ramp component 4 which is swivelably mounted on the low loader 2, a supporting foot which does not project rearwards beyond the low loader 2 in the swivelled-up transport position of the run-up ramp 1, a supporting foot is proposed which is composed of two toggle levers 9 which are connected to one another via a toggle joint 8, one of which is coupled by its free end to the low loader 2 and the other by its free end to the main ramp component 4 at a distance from the swivel axle 3, the toggle joint 8 bearing the ground support element 19 of the supporting foot. <IMAGE>
Patent AT-401726-B (AT)
Title: O-acylaryloxypropanolamines with tertiary or quaternary nitrogen as reversion modulators for p-glycoprotein- mediated multidrug resistance
Inventor: TELL BARBARA
IPC: A61K31/14
Filed: 1993-05-17
Granted: 1996-11-25
Abstract: The present invention relates to the use of compounds of the general formula I in which R1 and R2 are identical or different and are, independently of one another, branched or unbranched lower alkyl (C1-C7), cycloalkyl, aryl or arylalkyl, or else R1 and R2 are such that the nitrogen is incorporated into a 6-membered ring which may also contain another N heteroatom, it being possible for the additional N atom in turn to be substituted by alkyl, aryl or arylalkyl, each of which in turn may carry alkyl, alkoxy or halogen as substituent (e.g. with formation of piperidinyl, piperazinyl, 4-phenylpiperazinyl, 4-benzylpiperazinyl) and in which R3 is lower alkyl, preferably aryl-lower-alkyl, and the acid addition salts thereof in racemic and enantiomerically pure or enantiomerically enriched form for the preparation of pharmaceuticals for therapeutic use as reversion modulators for P-glycoprotein-mediated multidrug resistance. The present invention further comprises the use of compounds of the general formula II in which the radicals have the same meaning as in the general formula I and in which R4 is branched or unbranched lower alkyl, cycloalkyl or arylalkyl, preferably methyl, in racemic and enantiomerically pure enantiomerically enriched form for the preparation of pharmaceuticals for a therapeutic use and reversion modulators for a P-glycoprotein- mediated multidrug resistance. <IMAGE>
Patent DK-157861-B (DK)
Inventor: KARJALAINEN ARTO JOHANNES
IPC: C07D233/58
Filed: 1981-02-11
Abstract: The invention provides compounds of the formula:wherein each of R<sub>1</sub>, R<sub>2</sub> and R<sub>3</sub>, which can be the same or different is hydrogen, chloro, bromo, fluoro, methyl, ethyl, methoxv, amino, hydroxy or nitro; R<sub>4</sub> is hydrogen or alkyl of 1 to 7 carbon atoms; X is(R<sub>5</sub> is hydrogen or hydroxy) and n is 1-4; and their non-toxic pharmaceutically acceptable acid addition salts. These compounds exhibitvaluable pharmacological activity and are useful in the treatment of mammals, especially as anti- hypertensive agents. Furthermore, some of the compounds have proved to possess diuretic, ß-blocking activity and/or antithrombotic activity. The compounds may be made by a variety of methods and may be incorporated in pharmaceutical compositions also comprising a compatible pharmaceutically acceptable carrier.
Patent HU-211997-B (HU)
Title: Process to prepare n-methyl-n-(1-naphtyl-methyl)-4-(2-phenyl-propyl)-benzylamine and pharmaceutical compns. contg. it
Inventor: STUETZ ANTON
IPC: C07D209/14
Filed: 1987-01-15
Abstract: Compounds of formula I   <IMAGE> I  wherein R1 represents a group of formula   <IMAGE> IIa  <IMAGE> IIb  <IMAGE>  <IMAGE> IId  <IMAGE> IIe +TR  <IMAGE> IIf   and R2 represents hydrogen or lower alkyl, or R1 and R2 together with the carbon atom to which they are attached represent a group of formula IIg   <IMAGE> IIg   R4 and R5 represent independently hydrogen or lower alkyl, R3 represents hydrogen, alkyl, cycloalkyl or halogenalkyl and R6 represents a group of formula <IMAGE>  <IMAGE>  R1 represents a group of formula IIa to IIf as defined above, R2 and R3 together form a -(CH2)-u group wherein u stands for a whole number from 1 to 8 and R4, R5 and R6 have the meanings given above. which compounds are indicated for use as pharmaceuticals and agrochemicals.
Patent HU-208661-B (HU)
Title: Process for producing 2-(4-hydroxyphenoxy)-propionic acid enenthiomers from enanthiomer mixtures
Inventor: ACS MARIA
IPC: C07B57/00
Filed: 1991-02-15
Abstract: Resolution, with selected reagents, of 2-(4-hydroxy-phenoxy)-propionic acid enantiomers invariably yields a mixt. of enantiomers. Further sepn. to obtain desired enantiomer excess and selected racemic ratios, depends on the compsn. of a partic. enantiomeric mixt.. Resolution of such mixts. is carried out from lukewarm aq. solns. of stepwise acid- addn.. - This results in consecutive pptn. of various fractions, which are sepd. by filtration from the mother liquor. Optical purity of resulting fractions is a function of the primary mixt. compsn. and of the sequence of sepn.(Dwg.0/0)
Patent HU-205324-B (HU)
Title: Jack
Inventor: IPEKBAYRAK SELAHATTIN
IPC: B66F3/12
Filed: 1991-02-20
Abstract: The jack has a pillar (1) with a pivoted foot (2) at the bottom end and an arm (4) swinging about a pivot (5) in the middle. The free end (4a) of the arm can be raised by a hand crank (6) rotating a leadscrew (7). A plastics load support piece (8) is shaped at its upper end (8a) to fit round a weld seam, say, on the vehicle chassis. The bottom end (8b) is hemispherical and fits into a metal cup (10) welded to the arm (4). A moulded-in screw (12) passes through an elongated hole (11) in the cup and has a retaining disc (13) riveted on its end. This arrangement allows the support piece (8) is swivel in the cup (10) as the vehicle is raised.
Patent HU-187660-B (HU)
Inventor: PAPP JOZSEF
Filed: 1982-03-11
Abstract: A találmány kis teljesítményű melegvizes kazán, főképp, de nem kizárólagosan szilárd tüzelőanyagok elégetésére. A konvektív hőátvevő felületek arányának megnövelése miatt jól szabályozható. A különálló lapokból kialakított konvektív hőcserélő lehetővé teszi a füstjárat méretének csökkentését, valamint ennek folytán a tűzakna oly mérvű megnövelését azonos külső méretek mellett, hogy a napi tüzelőadag egyszerre berakható legyen. A kazán üzembe helyezése egyszerű, és megfelelő tüzelő esetén üzem közben a beszabályozás után további beavatkozást nem igényel. Mivel a napi szénszükséglet befogadására a tűzakna kellő nagyságú, a berendezés nagyon alkalmas családi házak fűtésére ott, ahol nincs mód a gyakori kezelésre. Szerkezetileg egyszerű, könnyen, olcsón gyártható. A nagy konvektív hőátvevő felület jó hatásfokot biztosít.  I. ábra -1-
Patent HU-193384-B (HU)
Inventor: BOREK ANDRAS
IPC: E06B9/08
Filed: 1985-03-04
Abstract: A találmány lényege a speciális kialakítású feltekercselő kilincsmüben (7) és a megvezetésben van. (1. és 3. ábra)  -1-
Patent HU-189242-B (HU)
Title: Fungicidal compositions comprising 2-triazolyl-ethanone- or -ethanol-derivatives as active substance and process for preparing these compounds
Inventor: TEN HAKEN PIETER
IPC: A01N43/653
Filed: 1983-03-09
Abstract: Novel compounds of the general formula: <CHEM> and acid addition salts and metal salt complexes thereof, wherein X represents an optionally substituted phenyl group; each Y independently represents a hydrogen or halogen atom or an alkyl group; Q represents a -CO-, -CS-, -CH.OH- or -CH.SH- group; and R represents a hydrogen atom or an optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl or phenyl group; exhibit fungicidal and/or plant growth regulating properties.
Patent HU-195518-B (HU)
Inventor: MOSHER CAROL W
IPC: A61K31/65
Filed: 1983-07-15
Abstract: A találmány tárgyai eljárás (I) általános képletű vegyületek - ahol R jelentése —CO—CH3 vagy — CHOH-CH3 csoport daunorubicin-származékok esetében vagy --C0-CH20H vagy -CHOH-CH2OH csoport doxorubicin-származékok esetében; A jelentése —CH csoport vagy hidrogénatom — és savaddíciós sóik, előnyösen hidrokloridjuk előállítására, oly módon, hogy egy (II) általános képletű vegyületet - ahol A és R jelentése a fenti - az adott esetben jelenlévő —C0-CH20H csoport hidroxilcsoportjának gyengén savas labilis védőcsoporttal, előnyösen p-metoxitritil-csoporttal 14-észterré alakítják és 0-3 °C-on alkoholos ammónia feleslegével reagáltatják és kívánt esetben szilikagél oszlopon diklór-metán és metanol 99:1-től 90—10 térfogatarányig változó elegyével eluálják és adott esetben az enyhén savas labilis védőcsoportot ecetsavval vagy hideg trifluor-ecetsavval szobahőmérsékleten lehasítják és a szabad bázis formájában kapott vegyületeket szilikagél-oszlopon kloroform és metanol 9 :1 térfogatarányú elegyével végzett eluálás után izolálják és kívánt esetben savval, előnyösen 0,1 η sósavval kezelve savaddíciós sóvá, előnyösen hidrokloriddá alakítják.  -1-
Patent HU-191175-B (HU)
Inventor: TEJFALUSSY ANDRAS
IPC: F27B9/14
Filed: 1981-04-06
Abstract: A találmány szerinti berendezés mozgatható mintatartót, a mintatartóhoz kapcsolt hőérzékelőket és a hőérzékélőkhöz csatlakoztatott szabályzó egységeket tartalmaz. A mintatartó (1) olyan kezelő terű, célszerűen zárt belső terű adapter, amely mozgató egységhez (4) kapcsolódó vonóelemmel (5) van ellátva, és a kemence fütőzönájából vagy zónáiból (11) legalább részben kihúzhatóan van kialakítva. A mintatartóban (1) lévő hőérzékélők (3) közül a hidegebb oldalon lévők legalább egyike (3a) a mozgató egységet (4) vezérlő szabályzó egységgel (9), a melegebb oldalon lévő hőérzékelők legalább egyike (3c) pedig a kemence fűtözónáinak (II) legalább egyikét vezérlő szabályzó egységhez (7) van csatlakoztatva, továbbá a hidegoldali hőérzékélő (3a) e minta hűtött és fűtött vége között helyezkedik el. A mintatartó (1) adott esetben mozgatható hőérzékélővé! (12) is el lehet látva. Ebben az esetben a mozgatható hőérzékelő (12) ésm szabályzó egységek (7, 9, 25) között programozható mikroprocesszor (24) van. A berendezés egy célszerű kiviteli alakjánál a mintatartó (1) gázbevezetö és/vagy gázkivezető csatlakozókkal (17, 19) ellátott zárt rctorta (Í5).  -1-
Patent LT-4436-B (LT)
Title: Device for grooming of cat
Inventor: ROSTANEC TATJANA
IPC: A61B3/00
Filed: 1998-02-09
Abstract: The device is used for supervising cats. It is used during veterinary inspections or while carrying out sanitary procedures. The device consists of holders for the animal's front and rear legs, a string, fixed to the part of element, which embraces the chest, at the back of the animal and on the sides, the holders of the front legs are fixed upon the mentioned string. The string and a chest-embracing element have means of length regulation, the animal's front leg holders and a stripe have fixation means. The fixation means of the front legs are made of a clingy stripe and the means for regulating the volume made out of the clingy stripe.
Patent LT-3231-B (LT)
Title: Methylpiperazinoazepine derivatives, preparation and use tereof
Inventor: LIEGEOIS JEAN-FRANCOIS FERNAND
IPC: C07D498/04
Filed: 1993-03-03
Abstract: Methylpiperazinoazepine derivatives of general formula (I), wherein X, R1, R2, N1 and N2 have various meanings, pharmaceutically acceptable salts thereof, and their preparation and use, are described.
Patent SE-321506-B (SE)
Inventor: ARSENEAU R
IPC: H03H11/48
Filed: 1965-01-22
Abstract: 1,046,711. Transistor reactance circuits; automatic exchange systems. STANDARD TELEPHONES & CABLES Ltd. Jan. 22, 1965 [Jan. 24, 1964], No. 2890/65. Headings H3R and H4K. A transistor circuit, Fig. 1, simulates an inductor having high A.C. impedance but low resistance between the input 50 and ground. A PNP transistor 51 is normally forwardly biased by potentiometers 53-55, 56-58 when the input 50 is at a desired potential, the collector output being applied to a grounded emitter NPN transistor 52 whose collector is directly connected back to the input 50 which is also capacitively coupled at 54 to the base of transistor 51. The capacitor 54 may be variable to vary the inductor effect and the circuit shows positive or negative A.C. input impedance dependent on the relative value of resistor 55. A D.C. or low-frequency input at 50 is unaffected by the capacitor 54, is amplified by both transistors and increases or decreases correspondingly the conductivity of transistor 52 shunting the input so that the input impedance is low. Such an inductor circuit 61, Fig. 2 (not shown), may be used in the telephone system described in Specification 953,895 to provide a low resistance path to earth for the battery B1 via the constant current source 66, diode network 62 and diode 72. The secondary of the repeat coil 65, terminating the subscriber's line 60, is in this case capacitively coupled at 68 to the network 62 and thus the previous need for completing the D.C. holding path for the network 62 through the repeat coil secondary is avoided. The diodes 71, 72 together form a gate which is opened when a call involving subscriber line 60 is to be made.
Patent YU-49471-B (YU)
Inventor: LIMOUSIN LAURENT
IPC: C05B1/00
Filed: 1998-05-22
Abstract: Uređaj za proizvodnju sulfoureičnog reagensa koji se koristi za dobijanje prirodnog fosfata u pogonu za proizvodnju azotnofosfatnih đubriva mešanjem i rastvaranjem čvrstih granula ili črstih čestica (G) uree u tečnosti (L), što je otvor (5) za ulaz granula (G) u sud (2) postavljen na gornjem delu, iznad nivoa (N) reakcione smeše u sudu (2) i što se uređaj za mehaničko mešanje sastoji od turbine (11) sa pravim lopaticama (12), koja je poznata kao turbina sablja, za pomeranje čvrstih granula (G) prema dnu suda (2) i sastoji se i od radijalne turbine (14) sa pravim lopaticama (15), koja je poznata kao Rašton turbina a postavljena je u sudu (2) na nivou nižem od trubine (11) za iniciranje mešanja granula (G) i njihovo rastvaranje. Prijava sadrži još 7 zavisnih patentnih zahteva.
Patent RS-50956-B (RS)
Inventor: BICKERS UDO
IPC: A01N25/30
Filed: 2001-07-13
Abstract: Postupak za suzbijanje bromusnih biljaka, gde se aplicira herbicidno sredstvo definisano prema jednom ili više zahteva 3 do 5, pre nicanja, posle nicanja ili pre i posle nicanja, po biljkama delovima billjaka, I biljnom semenu ili po površini na kojoj biljke rastu, na primer po površini za sejanje.Prijava sadrži još 4 patentna zahteva.
Patent ZA-89737-B (ZA)
Title: Innerseal for a container and method of applying pallet for blocks or bricks
Inventor: MCCARTY THERESA AILEEN
IPC: B65D77/38
Filed: 1989-01-31
Abstract: An easily removable innerseal for a container and method of application relates to an improved arrangement having a body portion (22) adapted for fitting over the upper rim of a container and a flexible element (24) attached to the body portion for a user to grip. The body portion is provided with a lower bonding layer, which includes a first bonding portion (26) and a second bonding portion (28) adhered to the first portion, and a layer (30) to prevent fluid from passing therethrough. The bonding force between the first and second bonding portions is designed to be weaker than the bonding force between the bonding layer and the container. In addition, the rupture strength of the first bonding portion is less than either of the bonding forces. As a result, the force required to remove the innerseal from the container is not dependent upon the amount of heat applied during sealing, because delamination will occur between the two bonding portions in an area over the container rim (14), leaving a residue of the first adhesive portion attached to the rim. By gripping the flexible element and pulling it upwardly, a user can remove the innerseal from the container without having to puncture or scrape the innerseal with a sharp object, which is frequently required to remove innerseals of the type commonly in use today. The method of application includes the steps of applying the body portion of the innerseal around the rim portion of a container and passing the container through an induction type heating station.
Patent ZA-92792-B (ZA)
Title: Process and apparatus for producing pumpable foodstuffs
Inventor: OTTO FRIEDRICH
IPC: A01J25/12
Filed: 1992-02-04
Abstract: <SAO ABE>     According to the invention, a continuous treatment process is proposed, in which, for example, cheese mass is heated by steam to, for example, 95 DEG C, passed through a mixing zone and there made highly turbulent and then emulsified by high speed rotating equipment, partially mixed and then supplied to further preparation and processing. 
<IMAGE>
Patent AT-409461-B (AT)
Title: Rotating bearing-mounted washer nozzle with hydraulic self-propulsion
IPC: B05B3/04
Filed: 1997-08-11
Granted: 2002-08-26
Abstract: The invention is a rotating bearing-mounted washer nozzle with hydraulic self-propulsion, specifically for containers to which a nozzle has been attached at the end of a washing fluid line and has slanted and/or tangential nozzles that are directed outward, whereby a counter-rotating hydrodynamic body is connected to a washer nozzle in the flow path of the washing fluid. The counter-rotating hydrodynamic body (7) is attached within the rotating bearing-mounted washer nozzle (1), which is mounted to rotate as a unit at the end of the washer fluid line (3, 11) and radially projects from the bearing (9) as well as the washer fluid line (3, 11), whereby slits are preferably provided parallel to the longitudinal axis of the washer fluid line in addition to backward facing nozzle openings (5) that are parallel to the longitudinal axis of the washer fluid line (2) in the area of the washer nozzle (1).<IMAGE>
Patent AT-402610-B (AT)
Title: Method of producing a metallic filter, in particular for removing mercury vapours from gases and an apparatus for implementing the method
IPC: B01D53/34
Filed: 1995-10-25
Granted: 1997-07-25
Abstract: A method of producing a metallic filter, in particular for removing mercury vapours, comprising a filter body of metal which can form an amalgam. On a framework of open- pored plastic foam, at least one metal of the group consisting of gold, silver and copper or an alloy thereof is deposited by an electroless method, if desired after prior electroless deposition of a metal supporting layer. The filter body is, if desired, subjected to heat treatment at 300 and 1200 degree C. An apparatus for implementing the method has a treatment container 10 which tapers at the bottom to form a funnel section 15 and can be fitted on top of a liquid container 18. A ventilation connection 16, a connection 24 and a connection 22 can be connected to a switching device 20 which is able to generate subatmospheric pressure as desired either in the section 23 of the treatment container 10 via a connection 22 or in the section 25 of the treatment container 10 via the connection 24 and at the same time to ventilate or close the other section in each case 25 or 23 which is not under subatmospheric pressure. <IMAGE>
Patent AT-402574-B (AT)
IPC: G05D23/00
Filed: 1994-09-26
Granted: 1997-06-25
Abstract: A heating apparatus having a radiant-surface burner 27 which is arranged in a combustion chamber 14 and has a heat exchanger 11, having a blower 1 for the supply of air and a gas nozzle 4, controlled by a gas valve 3, for the supply of gas, a control system for the blower 1 and the gas valve 3 being provided, whose input signals are supplied by an optical sensor, especially an infrared sensor 10, which is directed towards the radiant-surface burner 7 and is connected to a drive circuit 15 via a line 22. In order to be able to measure the temperature of the radiant-surface burner 17 simply and permanently reliably, provision is made for the sensor to be directed towards the radiant-surface burner 7, and for the optical sensor 10 to be shielded from the combustion chamber 14 by a protective lens 9, and for a flushing line 5 to branch off from an air duct 16, downstream of the blower 1, the said flushing line 5 opening into the combustion chamber 14 in front of the protective lens 9 or into an attachment 20 which branches off from the combustion chamber 14 and in which the optical sensor 10 and the protective lens 9 are arranged. <IMAGE>