baber/WOPTO huggingface dataset:
Patent EP-0001401-A1 (EP)
Inventor: HUNZIKER FRITZ DR
IPC: A61P25/24
Filed: 1978-09-09
Abstract: Thienabenzosepines of formula I,
     wherein
     R, is hydrogen, halogen. trifluoromethyl or alkyl, alkoxy. alkylthio, alkylsulfinyl or alkylsulfonyl, each of 1 to 4 carbon atoms.   R 2  is hydrogen, alkyl of 1 to 4 carbon atoms, hydroxyalkyl with a maximum of 4 carbon atoms, which may be acylated by an alkanoyl group of 2 to 18 carbon atoms of alkoxyalkyl with a maximum of 6 carbon atoms, and A is a radical of formula AI or All
     wherein   R 3  is hydrogen, halogen, trifluoromethylthio, trifluoromethylsulfinyl, trifluoromethylsulfonyl or alkyl, alkoxy, alkylthio, alkylsulfinyl or alkylsulfonyl, each of 1 to 4 carbon atoms.   R 4  is hydrogen or alkyl of 1 to 4 carbon atoms, with the proviso that one of R 3  and R, is hydrogen and the other of R 3  and R, is other than hydrogen, and   R 5  is halogen or alkyl of 1 to 4 carbon atoms, and their preparation.   (I) are useful for treating psychotic disturbances, depressions or relaxing muscles.
Patent EP-0006112-A1 (EP)
Inventor: SCHAMBERG ECKEHARD DR
IPC: C08G12/12
Filed: 1979-04-05
Abstract: Die Erfindung betrifft ein Verfahren zur Herstellung von wärmehärtbaren Harnstoff-Formaldehyd-Harzen mit einem Molverhältnis Harnstoff zu Formaldehyd von 1:1 bis 1:1,5, wobei in einem dreistufigen Verfahren Harnstoff und Formaldehyd zunächst im alkalischen, sodann im sauren und erneut im alkalischen Bereich kondensiert werden. Dabei beträgt das Harnstoff/Formaldehyd-Verhältnis in der ersten Stufe 1:1,5 bis 1:4 und wird in der dritten Stufe auf das Verhältnis 1:1 bis 1:1,5 eingestellt. Das Harnstoff-Formaldehyd-Harz wird bis zu einer Fällungszahl von 1:0,5 bis 1:3 kondensiert. Die erhaltenen Harze weisen gegenüber Trägerbahnen ein verbessertes Penetrationsverhalten auf. Die Harze sind bezüglich ihrer Hydrophilie verbessert. Ein weiterer Gegenstand der Erfindung ist deshalb die Verwendung der verfahrensgemäss erhaltenen Harnstoff-Formaldehyd-Harze zum Tränken und/oder Beschichten von Trägerbahnen, die für die Oberflächenvergütung von Holzwerkstoffplatten bestimmt sind.
Patent EP-0007441-A1 (EP)
Inventor: KIGUCHI TASABURO
IPC: C07C313/00
Filed: 1979-06-25
Abstract: A compound of the formula:
     wherein R is methyl or 2-methylthioethyl, is prepared by either
     (A) condensing a compound of the formula:
     wherein R is the same as above, or reactive derivative thereof with 3,4-diethoxycarboxyphenethylamine, or   (B) condensing the compound (11) or a reactive derivative thereof with dopamine, followed by reacting the resultant product with an ethoxycarbonyl halide. The compound (1) shows potent renal blood flow-increasing activity and is useful for the treatment of renal hypertension, congestive heart failure and other diseases due to renal blood flow disturbances.
Patent EP-0008446-A1 (EP)
Inventor: GURIEN HARVEY
IPC: C07D209/86
Filed: 1979-08-17
Abstract: The invention relates to a process for the preparation of known carbazoles of formula
     wherein R 2  is hydrogen, halogen, trifluoromethyl, hydroxy, lower alkyl, hydroxy-lower alkyl, lower alkylthio, amino, mono-lower alkylamino or di-lower alkylamino; and R 3  is halogen, trifluoromethyl, lower alkyl, hydroxy-lower alkyl, lower alkoxy, lower alkylthio, hydroxy, amino, mono-lower alkylamino or di-lower alkylamino, or R 2 , taken together with an adjacent R 3 , is lower alkylenedioxy,  
starting from an a-methyl-3- oxocyclohexane malonic acid di-lower alkyl ester and a substituted phenyl-hydrazine, as well as to novel carbazole derivatives utilized in this process.
Patent EP-0008794-A1 (EP)
Inventor: HERGENROTHER WILLIAM LEE
IPC: C08G79/02
Filed: 1979-09-05
Abstract: Polyphosphazene polymers are prepared which contain repeating units represented by the formulas:
     wherein X and X' are the same or different and are represented bv:
     wherein R 1  is selected from the group consisting of hydrogen and a methyl group; R 2  and R 3  are independently selected for each carbon atom from a group consisting of hydrogen and alkyl radical containing from 1 to 6 carbon atoms; 2 < m < 20; X' can additionally be selected from the group consisting of substituted and unsubstituted alkoxy, aryloxy, amino and mercapto radicals, and mixtures thereof, which are compatible with an alkoxy acrylate substituent and are known in the state of the art of polyphosphazene technology; and 20 < (w + y + z) < 50,000 per polymer. 
     The polymers of the invention can be utilized to form protective films and can also be utilized in applications such as for molding, coatings, foams and the like.
Patent EP-0013343-A1 (EP)
Title: Procédé et dispositif pour détecter une séquence pseudo-aléatoire de changements de phase de 0 degré et 180 degrés de la porteuse dans un récepteur de données
Inventor: BIGO FIRMIN
IPC: H04L7/10
Filed: 1979-12-04
Abstract: Procédé pour détecter une séquence pseudo-aléatoire de changements de phase de 0° et 180° de la porteuse fc dans un système à modulation à double bande latérale-porteuses en quadrature dans lequel cette séquence est précédée par une séquence d'inversions de phase de la porteuse. Les filtres 40 et 41 extraient les composantes à f1=fc-1/2T et à f2=fc + 1/2T du signal reçu; 1/T étant la cadence de signalisation. La mesure de l'énergie d'un signal S à la fréquence 1/T engendré à partir desdites composantes, ou de l'amplitude de la composante en phase de S permet de déterminer le début de la séquence pseudo-aléatoire. --Application à la détection de la sequence d'initialisation d'égaliseur recommandée par les avis V27 du CCITT.
Patent EP-0003892-A1 (EP)
Inventor: CHERRY PETER CLIVE
IPC: A61P31/04
Filed: 1979-02-15
Abstract: β-Lactam compounds of the formulae
     and
     are disclosed in which R represents a carboxyl or esterified carboxyl group and X represents a sulphonyloxy group. Processes for preparing the compounds and intermediates of use in their preparation are also disclosed. 
     The compounds are of value in the preparation of further β-lactam compounds, for example of formulae
     in which R is a carboxyl or esterified carboxyl group, and R is the residue of a sulphur nucleophile. 
     Compounds of formula (1) are also disclosed, together with processes for their preparation, pharmaceutical compositions containing them and intermediates of use in their preparation. The compounds of formula (1) are of value as antibiotics or as p-lactamase inhibitors.
Patent EP-0008194-A1 (EP)
Inventor: BILOW NORMAN
IPC: C07C67/00
Filed: 1979-08-01
Abstract: Novel thermosetting oligomers are formed by reacting epoxy prepolymers with aminoarylacetylenes. When heated to 170°C or above, these oligomers undergo acetylenic polymerization to form resins which exhibit superior thermal and hydrolytic stability when compared to conventionally cured epoxy resins.
Patent EP-0014478-A1 (EP)
Inventor: LEE THOMAS BING KIN
IPC: C07D495/04
Filed: 1980-02-11
Abstract: Verfahren zur Synthese in situ von Alkyl-4,10-dihydro-10-oxothieno-[3,2-c] -[1] -benzoxepin-8-acetat, dadurch gekennzeichnet, daß man a) 4-(2-Carboxy-3-thienylmethoxy)-phenylessigsäure zu ihrem Di-Säurehalogenid halogeniert, b) das Di-Säurehalogenid mit einem Aluminiumhalogenid zum 4,10-Dihydro -10-oxothieno-[3,2-c] -[1]-benzoxepin-8-acetyl-halogenid umsetzt und c) das erhaltene Acetylhalogenid mit einem niederen Alkanol zur gewünschten Verbindung umsetzt.
Patent EP-0019757-A1 (EP)
Inventor: BEIFUSS WOLFGANG DIPL-ING
IPC: G06F13/12
Filed: 1980-05-06
Abstract: Die Erfindung bezieht sich auf eine Datensende/-empfangseinrichtung mit Parallel/Seriell- und Seriell/Parallel-Zeichenumsetzung, deren Aufgabe es ist, die betreffende lokale Datenverarbeitungseinrichtung von allen mit Datenübertraguns-Prozeduren in Zusammenhang stehenden Aufgaben zu entlasten. Damit wird sowohl eine zeitliche Beeinträchtigung der Datenverarbeitungsvorgänge, als auch eine Verminderung des für Datenverarbeitungsvorgänge zur Verfügung stehenden Speichervolumens vermieden. Die diese Aufgabe lösende Datensende/-empfangseinrichtung ist dadurch gekennzeichnet, dass eine erste Modemanschlussleitung und eine zweite Modemanschlussleitung vorgesehen sind, dass zu sendende Datentelegramme wahlweise mittels entsprechend eingegebener Schaltbefehle von dem Mikroprozessor bitorientiert oder zeichenorientiert aus ihm zugeführten Datengruppen sendegerecht umgesetzt werden und dass Mittel zum wahlweisen Aussenden bitorientierter Datentelegramme nach dem an sich bekannten SDLC (Synchronous Data Link Control)-Verfahren oder dem an sich bekannten HDCL (High-Level Data Link Control)-Verfahren vorgesehen sind.
Patent EP-0019938-A1 (EP)
Inventor: HEINEMANN OTTO
IPC: F27B21/02
Filed: 1980-06-04
Abstract: The invention relates to a push grid comprising grid panels which overlap one another and which are alternately fixed and reciprocable longitudinally of the push grid; grid panel supports provided with a slot-like opening for holding the grid panels; tie members which project through the slot-like opening in the grid panel supports and which, at one end, engage in the associated grid panel; and spring elements arranged between the other end of the tie members and a web of the grid panel supports accommodating the slot-like opening for biassing the connection between the grid panels and the grid panel supports. In order to obtain reliable fixing of the grid panels to the grid panel support, for example even in the event of an excessive increase in length of the tie members or in the event of breakage of the spring elements, the web (7) with the slot-like opening (6) is arranged inclined relative to the horizontal and the suspension point (14) of the tie member (4) on the grid panel (1) is situated at a greater distance from the lower than from the upper end of the slot-like opening (6) (FIG. 2).
Patent EP-0022527-A1 (EP)
Inventor: BONALDI ANTONIO
IPC: C07J9/00
Filed: 1980-07-04
Abstract: The humid amorphous form of chenodeoxycholic acid undergoes a physical treatment at room temperature consisting in causing a collision of the particles of the amorphous product in bulk by means of shaking or stirring to prepare the solvent-free crystalline form of chenodeoxycholic acid which melts at 168-170°C.
Patent EP-0025949-A1 (EP)
Inventor: KRAMER WOLFGANG DR
IPC: A01N43/64
Filed: 1980-09-12
Abstract: Die Erfindung betrifft neue acylierte Triazolyl- γ -fluoropinakolyl-Derivate, mehrere Verfahren zu ihrer Herstellung und ihre Verwendung als Fungizide. Die neuen Verbindungen der allgemeinen Formel <IMAGE> in welcher Az, R, X, Z und n die in der Beschreibung angegebene Bedeutung besitzen, werden erhalten, wenn man 1-Triazolyl-2-hydroxy- butan-Derivate mit Säurehalogeniden, gegebenenfalls in Gegenwart eines Lösungsmittels und gegebenenfalls in Gegenwart eines Säurebindemittels umsetzt, daneben gibt es noch andere Verfahren. Die Wirkstoffe sind für den Gebrauch als Pflanzenschutzmittel geeignet und können mit besonders gutem Erfolg zur Bekämpfung solcher Pilze eingesetzt werden, die echte Mehltauerkrankungen hervorrufen.
Patent EP-0029588-A1 (EP)
Inventor: UTSCH FRANCIS V
IPC: A24B3/18
Filed: 1980-11-20
Abstract: Impregnated tobacco is expanded in an expansion operation involving the entrainment of the impregnated tobacco in a heated gas stream under high temperature- short entrainment time conditions resulting in a product of improved quality and enhanced expansion. The expanded gas that contains the tobacco is subjected to a tangential separation operation.
Patent EP-0014485-A1 (EP)
Inventor: REIJERKERK CORNELIS GERHARDUS
IPC: E01B7/24
Filed: 1980-01-09
Abstract: A railway points-heater has a burner (3), the burner body (4) of which consists of a gauze packet instead of ceramic material, by which the heating-up time, in which the flame burning on the outside may extinguish, has been reduced.
Patent EP-0013594-A1 (EP)
Inventor: BARKER ROBERT IRVING
IPC: G01N11/02
Filed: 1980-01-03
Abstract: The rheological properties of an extrudable material can be measured by extruding a strand of the material, measuring its diameter continuously, to give a series of diameter values, interpreting the variations in the strand diameter so as to characterize the surface of the strand, and deriving rheological data from the surface characteristics of the strand. The variations in the strand diameter can be interpreted as to peak-to-peak amplitude, average diameter value, the frequency of significant extreme values, standard deviations from a mean value, and the like. By means of these mathematical characterizations, the rheological behavior of the extrudable material can then be derived. The scorch behavior of a curable elastomer can be measured. The heterogeneity of a rubber compound can be described, or the macromolecular properties of a polymer can be measured (such as "gel", or degree of cross-linking.)
Patent EP-0021563-A1 (EP)
Inventor: MURPHY DAVID JOSEPH
IPC: C08J9/32
Filed: 1980-04-16
Abstract: A material suitable for thermosetting includes a collection of hollow particles adhesively mixed with a thermosetting resin in such proportions that the mixture exists in a granularform (3) and may be converted by thermosetting into a fused solid mass having a density not greaterthan0.5 grams per cubic centimetre. 
     The particles may be glass microbubbles or phenolic microballoons and the resin may be a hardenable Friedel-Crafts resin. The material according to the invention is more suitable for packing into shaped cavities (eg of 1) than known resins including those containing filler particles.
Patent EP-0042379-A1 (EP)
Title: Procede et appareil de separation de gaz avec des aubes ventilees
Inventor: WANG CHIA GEE
IPC: B01D59/20
Filed: 1979-12-19
Abstract: Procede de turbo separation et appareil de separation de melanges de materiaux gazeux ayant des poids moleculaires differents, en particulier des melanges d'isotopes gazeux tels que des melanges de UF6, ou les vitesses differentielles de sedimentation des composants a separer sont etablies dans une couche frontiere laminaire du gaz adjacente a une surface d'une aube poreuse, hydrauliquement lisse, et ou une quantite predeterminee de l'ecoulement de la couche frontiere est conduite au travers de la surface poreuse pour stabiliser la couche frontiere et pour fournir une fraction de gaz de densite plus elevee. La vitesse du gaz conduit au travers de la surface de l'aube poreuse ne devrait pas depasser la vitesse de sedimentation du gaz a separer.
Patent EP-0058733-A1 (EP)
Inventor: ROSBACH HANNELORE GEB HERBIG
IPC: A63H33/04
Filed: 1981-02-21
Abstract: The device of a curable or polymerisable material has a base plate (1), having a smooth upper side (1') and under side (1''), and two supporting walls (2), formed on the upper side (1') next to each other in plane-parallel arrangement with a distance in between. To form moulding chambers (7), there may be placed freely on the base plate (1) between the supporting walls (2) a grid-shaped mould insert (4), extending up to the supporting walls (2) and having open sides towards the supporting walls. <IMAGE>
Patent EP-0042036-A1 (EP)
Inventor: FISCHBECK GERD
IPC: B21G1/08
Filed: 1981-03-19
Abstract: The production method and the apparatus for this are concerned with the formation of conical tips (8) on tubular pieces (1), hollow needles, cannulas and the like. The tips (8) are formed with or without machining from a shape (7) which has been formed in advance with the aid of an additional material of the same type under the action of heat or without additional material from a length of tube material to be fused in. <IMAGE>
Patent EP-0041688-A1 (EP)
Inventor: SCHNEIDER MANFRED
IPC: C09B67/38
Filed: 1981-06-03
Abstract: Wasserlösliche Verbindungen der Formel <IMAGE> worin A ein Arylrest ist, X für gleiche oder verschiedene Gruppen der Formel -CH2-CH2- und -CH2-CH(CH3)- steht, R-CO-gleiche oder verschiedene Reste einer Carbonsäure mit bis zu 22 C-Atomen bedeutet, n für gleiche oder verschiedene Zahlen von 8 bis 150 steht, p eine Zahl von 1 bis 10 ist und m für 0 bis p- 0,5 steht, eignen sich zum Präparieren von Farbmitteln, insbesondere von Dispersions- und Küpenfarbstoffen.
Patent EP-0049347-A1 (EP)
Inventor: BELTROP HERBERT ING GRAD
IPC: B65G51/32
Filed: 1981-08-13
Abstract: Die Erfindung betrifft eine Rohrpostförderanlage, bei der ein die Probetransportbüchse (32; 46) in der Aufgabe- bzw. Empfangsstation (1, 3) aufnehmendes Rohrstück (14, 15; 41) um eine quer zur Längsachse dieses Rohrstückes liegende Achse (15, 19; 43) in eine Füll- bzw. Entleerungsstellung kippbar ist. Eine solche Förderanlage zeichnet sich durch einen besonders einfaches konstruktiven Aufbau und eine zuverlässige Betriebsweise aus.
Patent EP-0054724-A1 (EP)
Inventor: SCHMID KARL DR
IPC: C11C3/04
Filed: 1981-10-30
Abstract: This invention is directed to the preparation of  alpha -sulfofatty acid esters. More particularly, this invention is directed to a process for the simplified preparation of light-colored, wash-active esters of  alpha -sulfofatty acids with monovalent C1 to C8 alcohols or their salts from fats and oils of vegetable and/or animal origin comprising re-esterification with the monovalent alcohols or saponification and esterification with the monovalent alcohols, separation of the fatty acid ester formed, hydrogenation of the fatty acid ester, sulfonation, and bleaching, wherein a fatty acid ester fraction from which accompanying fatty acid glycerides have been removed to the extent of about 1 percent by weight or less, based upon the weight of the material to be sulfonated, is introduced into the sulfonation stage.
Patent EP-0051864-A1 (EP)
Inventor: GIES JAKOB
IPC: A63C11/02
Filed: 1981-11-05
Abstract: The ski carrier has a T-shaped piece, the horizontal part of which shows shell-like articulated pressing elements. Attachment (13) for cross-country skies can be inserted into the articulated elements.
Patent EP-0034861-A1 (EP)
Inventor: GEESSINK BERNARD THEODOOR
IPC: A01J25/13
Filed: 1981-02-16
Abstract: A cheese mould having a wall of plastic material, which wall is provided with fine holes and the inner surface of which may be provided with grooves, said inner surface being subjected to a roughening treatment, for instance rubbing with a steel brush, course sand paper, a rasp or a scouring substance, so that small scratches are made, in order to improve the rind forming properties of the mould.
Patent EP-0053570-A1 (EP)
Inventor: PELLENC ROGER JOSEPH PIERRE
IPC: A01D51/00
Filed: 1981-11-23
Abstract: 1. Frontal rotary wind rower for the raking of the residues of vegetation such as the branches of cut vines and pruning wood, or fruit fallen to the ground, or cut grass, comprising a fixed frame (1-2, 24, 37) adapted to be installed, in removable manner, at the front of an agricultural tractor and carrying two raking devices each comprising at least one rotary raking spinner (16) and its hydraulic rotary driving motor (17) carried by an arm (10, 42-46-47-48-49-50, 43-46-47-48-49-50) characterised in that the said raking devices are coupled to a common lifting system comprising at least one jack (5, 30, 38) and in that the arms carrying the raking spinners (16) are mounted with a capability of movement in a plane perpendicular to the vertical plane, this movement being obtained by means of jacks (12; 44, 45) coupling the said arms to a support beam (1, 27, 41-42-43) which moreover supports these arms at one of their ends.
Patent EP-0039737-A1 (EP)
Inventor: LEE ROBERT DEAN
IPC: H03M1/10
Filed: 1980-10-14
Abstract: Convertisseur analogique/digital a simple pente utilisant un DAC (convertisseur digital/analogique) (21) pour ajuster le courant de decharge d'un condensateur (10) pendant son etalonnage. Procede d'etalonnage du convertisseur analogique/digital repetant les phases necessaires pour obtenir un reglage correct du courant dans un bref intervalle de temps. Le convertisseur analogique/digital decharge un condensateur (10) au travers d'une haute impedance pour obtenir une decharge lineaire. Le temps necessaire a la decharge du condensateur (10) apparait dans un compteur et est indicatif de la tension aux bornes du condensateur (10) au commencement de la periode de decharge lorsque le convertisseur analogique/digital a ete etalonne.
Patent EP-0063593-A1 (EP)
Inventor: BRYANS THOMAS J
IPC: B60R22/10
Filed: 1981-10-30
Abstract: Systeme de protection d'enfants comprenant un coussin (15) reposant sur la banquette d'un vehicule (11) et un siege d'enfant (14) reposant sur le coussin ou sur la banquette independamment du coussin. Tant le coussin que le siege d'enfant supportes independamment sont concus pour etre retenus contre le siege au moyen d'une ceinture (13). Le siege d'enfant possede un systeme integre de harnais (49) servant a retenir un enfant dans le siege. Des elements permettant un engagement reciproque tel que des elements de languette (29) et de rainure (31) permettent de coupler le siege d'enfant au coussin. Un element de verrouillage (37) sert a assujettir le siege d'enfant au coussin de maniere a etablir une relation de couplage entre les deux. Le siege d'enfant, lorsqu'il est couple au coussin, est oriente dans un mode de transport d'enfant dans lequel l'enfant est dispose face a la partie posterieure du vehicule, et lorsqu'il est positionne independamment de la banquette, le siege d'enfant est oriente dans un mode d'elevation de siege dans lequel l'enfant est dispose face a la partie interieure du vehicule.
Patent EP-0066152-A1 (EP)
Inventor: WELLNER WOLFGANG DR
IPC: C08K5/47
Filed: 1982-05-14
Abstract: Die Erfindung betrifft die Verwendung von a) Dibenzothiazyldisulfid, b) Carboxylate und/oder organische Komplexverbindungen des Mangangs, Eisens, Nickels oder Kobalts und c) organische Basen, ausgewählt aus der Gruppe bestehend aus gegebenenfalls inerte Substituenten aufweisenden Guanidinen und tertiären Aminen, enthaltenden Katalysatorsystemen als Reaktionsbeschleuniger für die oxidative Härtung von Mercaptogruppen aufweisenden Kunststoffvorläufern.
Patent EP-0069966-A1 (EP)
Inventor: STAHLHOFEN PAUL DR DIPL-CHEM
IPC: C08G8/32
Filed: 1982-07-06
Abstract: A light-sensitive mixture is described, which contains, as the light-sensitive compound, a 1,2-naphthoquinone-2-diazidesulfonic acid ester of the general formula I    <IMAGE>  (I)  in which R and R' denote hydrogen atoms or lower alkyl groups, X denotes a saturated alkylene, hydroxyalkylene or dihydroxyalkylene group having 6 to 18 carbon atoms, D denotes the 1,2-naphthoquinone-2-diazide-5-sulfonyl radical or the 1,2-naphthoquinone-2-diazide-4-sulfonyl radical and n denotes a number from 1 to 20. The new quinone diazides produce printing plates which are capable of long printing runs and have good resistance to developer and good flexibility of the printing stencil.
Patent EP-0098323-A1 (EP)
Inventor: PICHLER JOSEF
IPC: B41J19/04
Filed: 1982-07-08
Abstract: A rotational movement of a constant speed drive is translated into a linear reciprocating motion having two relatively long, constant slope sections within a cycle, such section occuring in between two sequential reversals, and representing a constant speed. The speed modification is obtained by a universal joint-cross link with oblique axes and a crank output having a linear phase.
Patent EP-0073521-A1 (EP)
Inventor: EDER BERND
IPC: H05B3/26
Filed: 1982-09-01
Abstract: 1. An electrical heating system for heating a glass of a motor vehicle mirror, comprising a heatable metal plate (1, 101; 201) located on the rear of the mirror glass and at least two flat electric heating resistors (13, 13a; 210) each having a first connecting surface (19, 19a; 217) thermally and electrically connected to the metal plate (1; 101; 201) and a second connecting surface (18, 18a; 218) via a second metal plate, which is in the form of a current bridge (11; 206) and extends substantially plane-parallel to and electrically insulated from the metal plate (1, 101; 201) abutting the back of the mirror glass and forming part of the heating system comprises a single one-part sheet substantially adapted to the periphery of the mirror glass, that the current bridge (11; 206) is in the form of a narrow metal strip and that means (14-17) for securing the heating resistors (13, 13a) laterally in position are disposed on the current bridge (11; 206) and project from the plane thereof.