baber/WOPTO huggingface dataset:
Patent EP-0724063-B1 (EP)
Title: Rolling door
Inventor: HOERMANN STEPHAN DIPL-ING
IPC: E06B9/15
Filed: 1996-01-17
Granted: 1999-12-08
Abstract: The broad sides of the bars (1) are adjacent in the direction of movement. Their longitudinal edges interlink by round hook-shaped sectioned parts running at right angles to the casing's direction of travel. A sealing strip (10) runs along the longitudinal edges at the interlinking parts and is attached to one longitudinal edge. On the other longitudinal edge, at least when the casing is closed, the sealing strip closes the slot needed for the interlinking movement. The sealing strip consists of a folded metal strip (2) joined along its longitudinal edges.
Patent EP-0723813-B1 (EP)
Inventor: BIELEFELDT ERNST-AUGUST DIPL-I
IPC: B04C5/04
Filed: 1996-01-21
Granted: 2000-07-12
Abstract: A process and assembly separate and/or remove solid and/or fluid particles in a centrifugal chamber separator (1) into which approximately co-axial and mirror image arranged tubes (3, 3A) project. The medium (7A) which is to be separated, enters the central receiving area of the centrifugal chamber (1)tangentially by one or more inlet jets creating a secondary flow. A flow of cleaned heavy particles (6G) emerges through the tubes (3, 3A) from the centrifugal chamber (1). The separated particles egress through one or more curled slots and/or through ring slots (6, 6A) and are led away by a flow of residual raw gas. Before meeting with the secondary flow, the central receiving area flow is already divergent, minimising the inlet impulse losses by an adjustment of the secondary flow, and that the inlet flow has a wider reach in the radial direction.
Patent EP-0755677-B1 (EP)
Inventor: HAERLE ANTON PROF DR
IPC: A61L27/00
Filed: 1996-07-23
Granted: 1999-12-29
Abstract: The body to release a pharmaceutical agent locally, in or on body tissue, has a central round ellipsoid shape which tapers at the ends where the linking thread or wire emerges. The outer ends have a rounded contour. The body is of an inert carrier material such as polymethyl methacrylate.
Patent EP-0760354-B1 (EP)
Inventor: DEN TOHRU
IPC: H01L39/12
Filed: 1992-03-19
Granted: 2001-09-05
Abstract: Provided is a metal oxide material represented by the composition formula of LnaSrbCu3-xMxOc, where 2.7 </= a + b </= 3.3; 0.8 </= a </= 1.2; 6 </= c </= 9; and 0.05 </= x </= 0.7, Ln is at least one element selected from the group of elements of Y and lanthanoids or an atomic group consisting of said elements, and M is at least one element selected from the group of elements of Ti, V, Ga, Ge, Mo, W and Re or an atomic group consisting of said elements.
Patent EP-0724159-B1 (EP)
Inventor: GEE BERNARD
IPC: G01P3/481
Filed: 1996-01-24
Granted: 2001-08-01
Abstract: Method and apparatus for engine and rotary machine analysis provides a vibration sensor adapted to produce a plurality of superimposed waveforms corresponding to engine or machine operating parameters including rotational speed. Alternatively, exhaust gas pressure sensing may be used to obtain a corresponding waveform pattern. The pattern of waveforms is analysed, for example using a fast fourier transform technique whereby the characteristic pattern of waveforms can be identified and recognised. Changes in pattern can be used to assess the state of wear of a machine. <IMAGE>
Patent EP-0761260-B1 (EP)
Inventor: ARTUS JEAN-PIERRE
IPC: A63C5/075
Filed: 1996-08-01
Granted: 2003-02-26
Abstract: The shock absorber (14) is fixed to the upper surface of the ski with its longest dimension longitudinal. It has a layer of visco-elastic material (15) which is covered by a plate made of material with a high modulus of elasticity. The plate is an ellipse and its central part has two holes (17) which define a straight longitudinal tongue (18). The tongue is not fixed to the board and is flexible elastically so that it acts like a leaf spring. Its ends are joined to the plate but it does not have a layer of visco-elastic material.
Patent EP-0813547-B1 (EP)
Inventor: MOELLER THOMAS
IPC: C08B31/18
Filed: 1996-02-27
Granted: 1999-04-14
Abstract: PCT No. PCT/EP96/00791 Sec. 371 Date Oct. 7, 1997 Sec. 102(e) Date Oct. 7, 1997 PCT Filed Feb. 27, 1996 PCT Pub. No. WO96/27618 PCT Pub. Date Sep. 12, 1996A process for producing solid polycarboxylic acid salts from polysaccharides with gaseous nitrogen dioxide and dinitrogen tetroxide to at least partially convert the primary alcohol groups of the polysaccharides into carboxyl groups and form a solid polycarboxylic acid and then mixing the polycarboxylic acid with a solid neutralizing agent to at least partially neutralized the carboxylic acid groups of the polycarboxylic acid.
Patent EP-0820629-B1 (EP)
Inventor: MORIYA MITSUROU
IPC: G11B7/013
Filed: 1996-04-01
Granted: 2001-09-26
Abstract: An optical record carrier and methods and apparatuses for recording and reproducing an information on and from said optical recording carrier, whereby the effects of crosstalk from adjacent tracks is reduced, and stable tracing control is possible, is achieved. A recording track to which information divided into sector units is recorded is formed in a spiral or concentric pattern on the surface of the optical record carrier. Each sector further comprises sixty frames. Each frame comprises a re-sync pattern, frame address, data, and postamble fields. Identification information identifying the sector location of the information is recorded to the data block of the first frame. The user data is recorded after the data is scrambled using a value generated by a fifteen-stage maximum-length sequence generator based on the value of this identification information. The correlation between signals on adjacent tracks is thus reduced, and the effects of crosstalk are randomized, thus reducing the effect on the track error signal and enabling extremely stable tracking control.
Patent EP-0772887-B1 (EP)
Inventor: SPAAPEN ANTONIUS JOHANNES
IPC: H01J65/04
Filed: 1996-05-21
Granted: 1999-09-22
Abstract: La lampe à décharge basse pression sans électrodes décrite dans la présente invention est dotée d'une ampoule (1) fermée de façon à empêcher tout échappement de gaz, entourant un espace de décharge (10) et remplie de mercure et d'un gaz rare. L'ampoule possède une cavité (11) et une bague (13), ladite cavité (11) étant ouverte vers l'extérieur et contenant un filament électrique (2), et un support (3) avec un amalgame (30) étant placé dans l'espace de décharge (10). La bague (13) est métallique et le support (3) de l'amalgame (30) est fixé à la bague. Cette configuration empêche la dégénération de l'amalgame (30).
Patent EP-0857081-B1 (EP)
Inventor: CHA YOUNSIK
IPC: A61K38/38
Filed: 1996-10-25
Granted: 2004-01-07
Abstract: Peptide/protein biodegradable drug delivery devices are prepared as microspheres without the use of solvents by a polymer melt process. A melt of thermostable polypeptides and an appropriate low melting block copolymer mixture is prepared and dispersed in an appropriate fluid medium such as air, water or an immiscible organic fluid without using any organic solvent to form microdroplets. The fluid medium is cooled to solidify the microdroplets into microspheres and then collected and purified or further processed as drug delivery devices. These biodegradable microspheres are suitable as implantable or injectable pharmaceutical formulations. Following administration as solid microspheres into the body of a warm blooded animal, the formulations absorb water from the body to form a hydrogel from which the polypeptide is released continuously over an extended period of time.
Patent EP-0876393-B1 (EP)
Inventor: BIGGADIKE KEITH
IPC: A61K31/565
Filed: 1996-12-19
Granted: 2000-07-05
Abstract: PCT No. PCT/GB96/03153 Sec. 371 Date Jun. 24, 1998 Sec. 102(e) Date Jun. 24, 1998 PCT Filed Dec. 19, 1996 PCT Pub. No. WO97/24367 PCT Pub. Date Jul. 10, 1997Compounds of the pregnane series are described having general formula (I) or their solvates in which R1 individually represents -OC(=O)C1-6 alkyl; R2 individually represents hydrogen, methyl (which may be in the  alpha  or  beta  configuration) or methylene; or R1 and R2 together represent formula (a) where R5 and R6 are the same or different and each represents hydrogen or C1-6 alkyl; R3 and R4 are the same or different and each represents hydrogen or halogen; and +Z  represents a single or a double bond. Compounds of formula (I) and their solvates are useful as anti-inflammatory or anti-allergic agents.
Patent EP-0973791-B1 (EP)
Inventor: NG JOHN S
IPC: A61K31/58
Filed: 1996-12-11
Granted: 2007-06-20
Abstract: Multiple novel reaction schemes, novel process steps and novel intermediates are provided for the synthesis of epoxymexrenone and other compounds of Formula I wherein: -A-A- represents the group -CHR<SUP>4</SUP>-CHR<SUP>5</SUP>- or CR<SUP>4</SUP>-CR<SUP>5</SUP>- R<SUP>3</SUP>, R<SUP>4 </SUP>and R<SUP>5 </SUP>are independently selected from the group consisting of hydrogen, halo, hydroxy, lower alkyl, lower alkoxy, hydroxyalkyl, alkoxyalkyl, hydroxycarbonyl, cyano, aryloxy, R<SUP>1 </SUP>represents an alpha-oriented lower alkoxycarbonyl or hydroxyalkyl radical, -B-B- represents the group -CHR<SUP>6</SUP>-CHR<SUP>7</SUP>- or an alpha- or beta-oriented group: where R<SUP>6 </SUP>and R<SUP>7 </SUP>are independently selected from the group consisting of hydrogen, halo, lower alkoxy, acyl, hydroxyalkyl, alkoxyalkyl, hydroxycarbonyl, alkyl, alkoxycarbonyl, acyloxyalkyl, cyano, aryloxy, and R<SUP>8 </SUP>and R<SUP>9 </SUP>are independently selected from the group consisting of hydrogen, halo, lower alkoxy, acyl, hydroxyalkyl, alkoxyalkyl, hydroxycarbonyl, alkyl, alkoxycarbonyl, acyloxyalkyl, cyano, aryloxy, or R<SUP>8 </SUP>and R<SUP>9 </SUP>together comprise a carbocyclic or heterocyclic ring structure, or R<SUP>8 </SUP>or R<SUP>9 </SUP>together with R<SUP>6 </SUP>or R<SUP>7 </SUP>comprise a carbocyclic or heterocyclic ring structure fused to the pentacyclic D ring.
Patent EP-0798357-B1 (EP)
Inventor: WIRTH THOMAS DR
IPC: C09J157/00
Filed: 1997-03-17
Granted: 1999-08-18
Abstract: Process of sealing comprises pressing together at an elevated temperature two substrates, one of which has been coated with an aqueous dispersion containing a radically polymerised polymer. The dispersion further contains a polymer containing at least 20 wt.% ethylene and at least 5 wt.% ethylenically-unsaturated acid. Also claimed is an aqueous dispersion of a radically polymerised polymer obtained by emulsion polymerisation in the presence of an ethylene polymer. The dispersion further comprises the ethylene polymer.
Patent EP-0825307-B1 (EP)
Inventor: STROEVE HERMANUS JOHANNES MARI
IPC: E04B5/38
Filed: 1997-08-21
Granted: 2001-05-23
Abstract: A prefabricated concrete floor element, consisting of a cantilever beam-shaped part (2) provided with longitudinally extending hollow cores (4) and reinforcing wires (5) parallel thereto, which beam-shaped part (2) is on one or both sides provided with (a) laterally projecting wing(s) (3) whose bottom face (11) aligns with the bottom face of the beam-shaped part (2) and whose thickness (d) is considerably less than that (D) of the beam-shaped part (2). The wings (3) and the interposed bottom layer (8) of the beam-shaped part (2) are provided with longitudinal and transverse reinforcing wires (6, 7) and with reinforcing elements (10) that project from the top face (12) of the wing(s) (3) and have their bottom sides connected to the longitudinal and transverse reinforcement (6, 7) of that (those) wing(s) (3). <IMAGE>
Patent EP-0874996-B1 (EP)
Inventor: DONNER MICHAEL
IPC: G01P3/487
Filed: 1997-01-15
Granted: 2001-06-27
Abstract: PCT No. PCT/EP97/00152 Sec. 371 Date Jun. 2, 1998 Sec. 102(e) Date Jun. 2, 1998 PCT Filed Jan. 15, 1997 PCT Pub. No. WO97/26543 PCT Pub. Date Jul. 24, 1997A magnetic pole rotor having a plurality of magnetic poles which are arranged on a base ring. The technical problem is to construct the magnetic pole gear such that a non-rotational connection to the shaft remains assured, even at high operating temperatures. A plastics ring (5) surrounding the magnetic poles is pressed onto a cylindrical surface (2) of the base ring (1) and a cage ring (6) covers the plastics ring (5).
Patent EP-0943010-B1 (EP)
Inventor: GENDRE FRANCOIS
IPC: C12Q1/689
Filed: 1997-10-27
Granted: 2002-03-13
Abstract: A process for detecting live microbiological contaminants in a food product sample, according to which the presence of mRNA coding for the synthesis of a protein involved in the synthesis of proteins by the contaminants is detected in the sample.
Patent EP-0918761-B1 (EP)
Title: Derives benzylamine a substitution amido et amino, et classe de ligands specifiques du neuropeptide y1
Inventor: BLUM CHARLES A
IPC: C07D213/81
Filed: 1997-07-18
Granted: 2003-05-02
Abstract: La présente invention concerne des composés représentés par la formule générale (I) et convenant au diagnostic et au traitement de troubles nutritionnels, tels que l'obésité et la boulimie, et au traitement d'affections cardio-vasculaires, telles que l'hypertension artérielle primitive et l'insuffisance cardiaque globale, imputables à la liaison de ces composés aux récepteurs de neuropeptides Y1 humains. Dans cette formule générale (I), X1, X2 et X3 représentent indépendamment chacun des substituants représentés par la formule spécifique (A) ou de l'un de leurs sels pharmaceutiquement admis. Dans ces formules, C est N ou O; D n'est rien lorsque C est O, H, alkyl inférieur à chaîne droite ou ramifiée portant de 1 à 6 atomes de carbone, unité méthylène incorporée dans un cycle connecté à F (également un méthylène) comme dans les cas des pyrrolidine, pyrrolidone, pipéridine et pipéridone; E est O ou H2; F est alkyl inférieur à chaîne droite ou ramifiée portant de 1 à 6 atomes de carbone, hétéroaryl, lequel hétéroaryl appartient de préférence au groupe des 2-, 3-, 4-pyridyl, 2-pyrazyl, 2- ou 3-thiényl, 2-pyrazinyl, 2-, 3- ou 4-quinolyl, 1-, 3- ou 4-isoquinolyl, 2-quinoxalyl, 3- ou 4-cinnolyl, hétéroaryl à substitution halogène, hydroxy, alkyl inférieur à chaîne droite ou ramifiée portant de 1 à 6 atomes de carbone, ou alcoxy inférieur à chaîne droite ou ramifiée portant de 1 à 6 atomes de carbone; A et T sont des substituants organiques ou non organiques; n vaut 1, 2 ou 3; m vaut 2, 3 ou 4; R1-R4 sont hydrogène ou des substituants organiques; et B est azote, carbone, soufre ou oxygène.
Patent EP-0914748-B1 (EP)
Inventor: LECHNER GERHARD
IPC: H04Q3/62
Filed: 1997-07-25
Granted: 2003-11-19
Abstract: Selon l'invention, est stocké, dans le réseau mobile public (PLMN), au moins un numéro d'identification (PIID) servant à l'identification d'un réseau privé (PISN) pour l'accès à une installation d'abonné avec postes supplémentaires (PBX1) qui enregistre un appel destiné à un abonné (BS) et envoie un numéro d'abonné mobile (MSISDN) dans le réseau mobile public. Un numéro d'acheminement (PIRN) est mis en forme sur la base du numéro d'abonné mobile (MSISDN) entrant, dans le réseau radio mobile, et contrôlé par rapport au numéro d'identification (PIID) stocké, ce contrôle servant à déterminer si la destination de l'appel se trouve dans la zone d'une installation d'abonné avec postes supplémentaires (PBX2) du réseau privé (PISN) auquel appartient également la première installation d'abonné avec postes supplémentaires (PBX1). Dans ce dernier cas, des informations d'acheminement (RIN), qui fixent la destination de l'appel après lancement de l'appel dans le réseau mobile public, sont transmises à la première installation d'abonné avec postes supplémentaires (PBX1) qui établit ensuite la liaison avec la destination de l'appel sur la base des informations d'acheminement (RIN) reçues dans le réseau privé (PISN).
Patent EP-0944600-B1 (EP)
Inventor: PEET NORTON P
IPC: C07D213/68
Filed: 1997-09-12
Granted: 2002-01-30
Abstract: A process of converting a hydroxy heteroaromatic compound to an arylamine, comprising the steps of : 1) treating a salt of a hydroxy heteroaromatic compound with an alkylating agent; and 2) treating the reaction mixture with a Smiles solvent system and raising the temperature of the reaction mixture; and a compound made according to the above process.
Patent EP-0914531-B1 (EP)
Inventor: KINTSCHER MATTHIAS
IPC: E04G21/14
Filed: 1997-07-18
Granted: 2001-05-30
Abstract: PCT No. PCT/EP97/03870 Sec. 371 Date Jan. 20, 1999 Sec. 102(e) Date Jan. 20, 1999 PCT Filed Jul. 18, 1997 PCT Pub. No. WO98/03751 PCT Pub. Date Jan. 29, 1998A device for assembling prefabricated concrete parts has a cable loop anchored at one end to the prefabricated concrete part. The other loop-like end cooperates with a retaining means provided at the front face of the prefabricated concrete part to elastically bend the cable loop approximately at right angle during the fabrication of the prefabricated concrete part, and to release it for assembling. An elongated, U-shaped box (1) having a substantially uniform cross-section is provided as retaining means. The bottom (2) of the box has one or several passages (4) for the cable loop (5) and means arranged in the area of the passages (4) to retain the cable loop (5) perpendicularly to the longitudinal extension of the box (1).
Patent EP-0946777-B1 (EP)
Inventor: HEILER HANS-JOACHIM
IPC: C23C2/28
Filed: 1997-09-03
Granted: 2001-07-11
Abstract: A thin sheet is coated by hot dip galvanization with a zinc based alloy comprising 3.5% to 15% by weight of aluminum. Immediately after solidification of the coating, the thin sheet is heated for 2 to 10 seconds to a temperature 20 to 100° C. above the melting point of the coating. The thin sheet is then cooled to room temperature.
Patent EP-1012418-B1 (EP)
Inventor: KRISTIANSEN HANS
IPC: E04B1/70
Filed: 1997-08-07
Granted: 2002-12-04
Abstract: A method for dehydrating capillary materials such as moist walls and/or floors of a building structure of masonry or concrete through the principle of electro-osmosis by applying pulsating DC voltage of a specific pulse pattern to primary electrode means embedded in said structure, said primary electrode means (4) forming anode means, and secondary electrode means (5) embedded in the ground outside the structure and forming cathode means to be interactive with said anode means, said pulsating voltage having a pulse pattern with a total pulse period T, comprised of a positive pulse of duration T+, a negative pulse of duration T-, and a neutral period or pause of duration Tp, wherein: 0.8T<T+</=0.98T; 0.0T<T-</=0.05T; 0.02T<Tp</=0.15T; and 3 seconds<T</=60 seconds. Suitably, T+=0.95 T; T-=0.01 T; and Tp=0.04 T.\!
Patent EP-1006983-B1 (EP)
Inventor: ALANEN PENTTI
IPC: A61J17/00
Filed: 1997-12-11
Granted: 2005-09-28
Abstract: The invention is directed to a pacifying or a feeding dummy comprising an actual mouthpiece (10) and a cover piece (11) for attaching the dummy to a feeding bottle. The actual mouthpiece comprises a piece made of an elastic material to be held in the mouth of a baby between the tongue and the palate. The mouthpiece of the pacifying dummy can be either a hollow or a solid piece. The invention is characterized in that the wall (13) of the hollow mouthpiece or the solid mouthpiece has a space (14) formed into it for the insertion of a dosage unit (20) containing an active agent.
Patent EP-0956296-B1 (EP)
Inventor: MORGAN BARRY
IPC: A61P5/02
Filed: 1997-12-04
Granted: 2006-06-21
Abstract: The invention features somatostatin antagonists having a D-amino acid at the second residue.
Patent EP-0939840-B1 (EP)
Inventor: JAEGER GUIDO
IPC: D05B57/28
Filed: 1997-11-12
Granted: 2002-03-27
Abstract: Method for transmitting thread-specific data in re-reeling operations for the manufacture of two-thread lock stitch seams which have to be documented comprising the following steps: the bobbin taking over the thread, in particular the under-thread bobbin (10) is provided with a definite bobbin identification, in a reeling station (28), in which thread material for the under-thread is reeled from a thread stock (30) onto the under-thread bobbin (10), the bobbin identification is detected and is stored in a data storage medium (24) together with a first data record characterizing the thread material and the reeling operation, after inserting the under-thread bobbin (10) into a sewing machine (18) the bobbin identification is detected, from the bobbin identification the first data record stored therewith is determined and is assigned to a second data record concerning the sewing operation and/or the sewn product, whereupon the data set so formed is stored.
Patent EP-0944610-B1 (EP)
Inventor: PIERCE MICHAEL ERNEST
IPC: A61P31/18
Filed: 1997-12-15
Granted: 2005-02-16
Abstract: Process for asymmetric synthesis of benzoxazinone derivatives of formula (VI), comprises: (a) reacting (I) with (VII) or (VIII) in the presence of an acid catalyst to give (II) which is reacted with a mixture of (IX), alkyl lithium and cyclopropylacetylene to give (III); (b) (III) is oxidised to (IV) and this is reacted with a cleaving agent and a trapping agent to give (V); and (c) (V) is treated with a cyclising agent to give (VI). X = Cl or F; A = CF3, C2F5 or C3F7; R1 = H, 1-6C alkyl or 1-6C alkylcarbonyl; R2 = H; R3 = H, Me, Et or phenyl substituted by up to 3 of R12; R4, R5, R4a, R5a, R6, R8, R9 = H, 1-6C alkyl, 1-6C alkoxy or 1-6C alkylthio; R12 = H, 1-6C alkyl, 1-6C alkoxy or 1-6C alkylthio; Y = (CH2)n or O; n = 0 to 3; P = amine protecting group of formula (a) or (b); P" = group of formulae (c) or (d); R10, R11 = 1-4C alkyl; or NR10R11 = pyrrolidinyl, piperidinyl or morpholinyl.
Patent EP-0873682-B1 (EP)
Inventor: DUDITS DENES DR
IPC: A01H5/10
Filed: 1991-06-18
Granted: 2002-09-04
Abstract: Protoplasts which regenerate reproducibly in a short time to normal, fertile plants can be regenerated from an auxin-autotrophic genotype of Zea mays (L.).
Patent EP-0964618-B1 (EP)
Inventor: WILLCOCKS NEIL A
IPC: A23G1/36
Filed: 1998-01-09
Granted: 2003-12-10
Abstract: Methods of making chocolates that minimize the dramatic increases in viscosity typically associated with tempered chocolate. The invention also relates to the ability to process chocolates at higher temperatures without the need to temper at low temperatures.
Patent EP-0968234-B1 (EP)
Title: Systeme catalyseur supporte destine a la polymerisation d'alk-1-enes
Inventor: KRISTEN MARC OLIVER
IPC: C08F4/6192
Filed: 1998-02-18
Granted: 2006-05-10
Abstract: Système catalyseur destiné à la polymérisation d'alk-1-ènes C2 à C12, qui contient (A) un support organique ou inorganique, (B) au moins un complexe métallocène, (C) des composés oligomères d'oxyde d'aluminium et (D) au moins un composé de bore de formule générale (I) ou un composé de bore cyclique de formule générale (II) ou des mélanges des composés de bore (I) et (II). Dans lesdites formules, les substituants ont la signification suivante: R1 à R4 est un groupe alkyle C¿1? à C20 qui peut être substitué par des atomes d'halogène, des groupes aryle C6 à C15 et/ou des groupes alcoxy C1 à C10; un groupe cycloalkyle C4 à C7 qui peut être substitué par des atomes d'halogène, des groupes alkyle C1 à C10 et/ou des groupes alcoxy C1 à C10; un groupe alcoxy ou sulfure d'alkyle C1 à C10 qui peut être substitué par des atomes d'halogène, des groupes alkyle C1 à C10 et/ou des groupes aryle C6 à C15; un groupe aryle C6 à C15 qui peut être substitué par des atomes d'halogène, des groupes alkyle C1 à C10, des groupes halogène-alkyle C1 à C10, des groupes cycloalkyle C4 à C10, des groupes aryle C6 à C15, des groupes alcényle C1 à C10, des groupes amino, des groupes mono- ou dialkylamino, des groupes nitro, des groupes formyle, des groupes acétamido et/ou des groupes alcoxy C1 à C10; ou un hétérocycle C3 à C15 saturé ou insaturé qui contient dans le système cyclique un à trois atomes d'oxygène, de soufre et/ou d'azote et qui peut être substitué par des atomes d'halogène, des groupes aryle C6 à C15, d'autres hétérocycles C3 à C15 et/ou des groupes alkyle C1 à C10; R?1 à R4¿ étant en outre défini comme ci-dessus et portant également un à trois autres groupements B(OR')(OR''), ou dans le cas où R1 à R4 contient un noyau aromatique, ledit noyau fait partie d'un système métallocène; R' et R'' sont identiques ou différents et sont chacun hydrogène ou un groupe alkyle C¿1? à C10.