baber/WOPTO huggingface dataset:
Patent CN-1526128-B (CN)
Title: 平面单元构造体
Inventor: KOICHI INOUE
IPC: H05K7/12
Filed: 2002-04-05
Granted: 2011-05-18
Abstract: 信息处理装置，特别是兼作显示装置或输入装置的平面显示单元，被要求在安装于壳体上时实现小型化。为此，提供一种平面单元构造体，其特征在于，把平板状且矩形状的平面显示单元(5)在其左右两侧和上面中央部的3个地方分别由固定配件(12，13)固定在壳体(4)上，平面显示单元(5)的左右两侧用配件(12)用螺钉固定在作为壳体的后盖(4)上，平面显示单元(5)的上面中央部由配件(13)夹入其里面·表面间地固定在壳体上。
Patent CN-1016384-B (CN)
Title: 印刷汉字识别装置的印刷汉字识别方法
Inventor: XINZHONG ZHANG
IPC: G06K9/80
Filed: 1985-04-01
Abstract: 印刷汉字识别装置的印刷汉字识别方法，属于模式识别和计算机人工智能的技术领域。该方法是一种基于汉字特殊点的识别方法，即在计算机中存贮汉字特殊点知识，自上而下不需抽取特征直接地去识别印刷汉字的方法。它能实现印刷汉字的自动识别，使汉字文本能高速进入计算机，解决各种汉字信息处理系统中手动编码输入汉字效率低的问题。用本方法实现的装置由扫描输入设备和微型计算机组成。
Patent CN-85102685-B (CN)
IPC: C08G69/34
Filed: 1985-04-16
Abstract: 本发明是关于制造抗滑漆的一种方法，在其中除了使用通用的印刷油墨粘结剂而且必要时还有溶剂、染料、颜料，抗氧剂作为起钝化作用的添加物以外，还同时使用由1.5-2个当量的聚合脂肪酸和1个当量的至少一种二伯醚二胺且必要时为共二胺组成的缩合产物。
Patent CN-1015097-B (CN)
Title: 矿山副井提升过卷防蹾罐缓冲装置
Inventor: YUNZENG DONG
IPC: B66B5/28
Filed: 1989-08-12
Abstract: 发明提供了一种矿山副井提升过卷防蹾罐缓冲装置，它利用摩擦缓冲原理，主要由缓冲本体、活滑块、蝶形弹簧、压板、缓冲滑道、挡板、螺栓组成，具有结构简单，投资少、安全可靠，适用于大、中、小型矿井等优点。
Patent FI-112435-B (FI)
Inventor: ENGELHOLM TORBJOERN
IPC: A23N7/02
Filed: 2000-02-09
Granted: 2003-12-15
Abstract: The present invention relates to a peeling element (10, 11) having a rod-like shape and being attached to means for rotating the peeling element around a rotation axis (3) and comprising peeling means on an outer surface. To allow a product to be peeled in a single peeling device, on a first part (1) of said peeling element (10, 11) said outer surface comprises a rough scraping surface, and on a second part (2) of said peeling element (10, 11) at least one cutting means (4). <IMAGE>
Patent FI-113684-B (FI)
Inventor: PARO DANIEL
IPC: F02M65/00
Filed: 2001-04-10
Granted: 2004-05-31
Abstract: A fuel injection valve comprising a needle valve assembly (2) arranged in a valve body (1), where a valve needle (2') is arranged to control the fuel injection into a cylinder (11) of an engine from a fuel chamber (5) arranged in the valve body (1). The fuel injection valve comprises a pressure sensing chamber (6) arranged in communication with the fuel chamber (5) and pressure measuring means (7) are arranged in communication with the pressure sensing chamber (6). The invention also relates to a method for fuel injection, wherein fuel is conducted at raised pressure, controlled by a valve needle (2') arranged in the valve body (1) from a fuel chamber (5) to a cylinder (11) of an engine, and wherein fuel is conducted from the fuel chamber (5) at raised pressure via pressure reducing means (9) arranged in the valve body to the pressure sensing chamber (6), where pressure measuring means (7) are arranged to monitor the operation of the injection valve.
Patent FI-110404-B (FI)
Title: Device for removing and destroying acarids on bees comprises a mirror within the hive to Reflect light from the flight opening and covered with mesh making the bees rush towards the mirror brushing the mites off their bodies
Inventor: VAINIO URPO KALERVO
IPC: A01K51/00
Filed: 2001-10-30
Granted: 2003-01-31
Abstract: Mirror(4)positioned within a bee hive facing flight opening(6)reflects outside light and the interior of the hive enclosed by a grating mesh(3).The bees attracted to the mirror cause an agitated movement brushing against the mesh and detaching the mites from the their bodies.  Preferred features;Mites detached from the bees fall through mesh false floor(2)above pull out tray(1)for disposal.The mesh having a gage that permits passage of the mites but not the bees.Strip(5)attached to the hive prevent the mites from escaping from the tray and reinfecting the bees.
Patent FI-116836-B (FI)
Inventor: RUOTANEN KYOESTI
IPC: C04B35/66
Filed: 2003-03-25
Granted: 2006-03-15
Abstract: The invention relates to a method for manufacturing a heat-resistant and heat-insulating structure. According to the invention, a dry matter composition is formed containing 10-60 w-% fine fraction the particle size of which is < 0.1 mm and which includes a dry component that binds air bubbles, and 40-90 w-% coarse fraction the particle size of which is > 0.1 mm, and 5-20 w-% water is mixed into the dry matter composition to form a substantially homogenous and flowing structural material, and the structural material is moulded into the desired structural shape, and water is evaporated from the structural material to form a heat-resistant and heat-insulating structure. Furthermore, the invention relates to a heat-resistant and heat-insulating structure, as well as to a structural material and dry matter composition for use in the manufacture of a heat-resistant and heat-insulating structure.
Patent FI-129933-B (FI)
Title: Management of predictive models of a communication network
Inventor: SALMENKAITA JUKKA-PEKKA
IPC: H04L41/5025
Filed: 2019-11-04
Granted: 2022-11-15
Abstract: A computer implemented method of managing a predictive model of a communication network, wherein the predictive model is configured to identify and correct forthcoming failures in network devices based on data collected from the network devices. The method includes allocating (302) network devices of the communication network into first and second clusters, disabling (303) the predictive model in the first cluster, enabling (304) the predictive model in the second cluster, collecting (305) data from the first cluster, repeating (306) said disabling, enabling and collecting with a new allocation of first and second clusters to continuously collect data with different allocation of first and second clusters, and outputting (307) at least the data collected from the first cluster for analysis of the predictive model.
Patent HK-1042730-B (HK)
Title: Alzheimer's disease secretase
Inventor: MARK E GURNEY
IPC: G01N33/50
Filed: 2002-05-31
Abstract: The present invention provides the enzyme and enzymatic procedures for cleaving the β secretase cleavage site of the APP protein and associated nucleic acids, peptides, vectors, cells and cell isolates and assays.
Patent HU-180433-B (HU)
Inventor: BUCHER FRANZ
IPC: E04C5/04
Filed: 1979-06-18
Abstract: Die Erfindung betrifft eine Reihe von einachsig tragenden Bewehrungselementen gleicher Breite, insbesondere von Bewehrungsmatten für Stahlbetonmassivdecken oder dergleichen, mit einer innerhalb der Reihe ansteigenden Zugkraftaufnahmefähigkeit der Längsbewehrung. Durch die Erfindung soll eine
Patent IT-1248460-B (IT)
Title: Method and machine for wrapping products with extendable film
Inventor: NICOLETTI CARLO
IPC: B65B/
Filed: 1991-01-25
Granted: 1995-01-19
Abstract: The wrapping film undergoes a first pre-tensioning operation in a first direction, within a maximum permissible value of the film, and then the said film undergoes a second pre-tensioning operation in a second direction transverse with respect to the said first direction, while at the same time the said first pre- tensioning force is suitably and uniformly reduced so as to allow the maximum extendibility in the said second direction. The film inserted into the winding station has a length which is proportional to the dimensions of the product to be wrapped and the said first and second pre- tensioning steps are also proportionally according to the dimensions of the product. When the product is raised and pushed against the pre-tensioned film, the first and the second pre-tensioning forces are suitably and uniformly reduced. The film is fed into the winding station and undergoes the first pre-tensioning operation, by means of a gripper 34 for unwinding the film and a dispensing device 18 through which the said film fed from the supply reel passes. The dispensing device and the gripper are operated with a self-centring movement. <IMAGE>
Patent IT-1246057-B (IT)
Title: Method and device for binaural indication of the myoelectric activity of two muscle groups
Inventor: LAMPIS MARCO
IPC: A61B/
Filed: 1991-04-08
Granted: 1994-11-07
Abstract: A method for indication of the bioelectric activity comprises the phases of applying two series of electrodes for recording the myoelectric signals connected to the activity of muscles, processing each signal in order to obtain parameters dependent on at least one characteristic thereof and using them to control a circuit for emission of a sound signal to vary the magnitude thereof. The two sound signals so obtained are each sent separately to an ear pad of at least one binaural headset. By this method an electronic device 10 for recording bioelectric activity comprises two series of recording electrodes 11, 11', each connected to a circuit for pre-amplification 12, 12' and amplification 13, 13' of the myoelectric signals recorded. The output of the amplification circuit is connected to a circuit 15, 15' for processing the signal which obtains a parameter dependent on the signals recorded, and uses it to control a circuit 16, 16' for emission of a sound signal. Two sound signals are thus obtained with a magnitude that is dependent on the signals recorded by the two series of electrodes. Said two sound signals are each sent separately to an ear pad of at least one binaural headset 18. <IMAGE>
Patent IT-1252294-B (IT)
Title: Dispositivo per il bloccaggio dell'asta di chiusura di porte di sicurezza
Inventor: RAVEGNINI RENZO
IPC: E05B65/10
Filed: 1991-11-15
Granted: 1995-06-08
Abstract: Il dispositivo per il bloccaggio dell'asta di chiusura di porte di sicurezza comprende un organo a leva oscillabile attorno a un asse orizzontale fra una posizione abbassata e una posizione attiva sollevata, verso la quale è sollecitato da mezzi a molla. L'organo a leva conforma uno scrocco disposto anteriormente all'asta di chiusura, secondo il verso di apertura della porta, e destinato a risultare sporgente al di sopra della porta, nella suddetta posizione attiva dell'organo a leva. Un organo di aggancio, solidale all'organo a leva, è atto a impegnare, nella detta posizione attiva, una dentatura sagomata sull'asta di chiusura, in modo da impedire lo scorrimento verticale verso l'alto.
Patent IT-1255210-B (IT)
Title: Machine for filling bottles and the like
IPC: B67C/
Filed: 1992-07-03
Granted: 1995-10-20
Abstract: The machine comprises a turntable with a central drink tank and several filling tanks either rigidly fixed or hinged to it. In the first case each filling tank has a piston to discharge the drink into the bottles and is fitted with means for varying its capacity according to signals sent from a control unit and provided with weighing operations performed by a first load cell that weighs the bottle when empty and a second load cell that weighs the bottle when full. The control unit alters the capacity of each filling tank if this does not correspond to the programmed value for the quantity of drink that the bottle is to contain until they correspond. In the second case, there is a further load cell that weighs in sequence the quantity of drink contained in each filling tank and sends a signal corresponding to this value to the control unit for control purposes. <IMAGE>
Patent IT-1271965-B (IT)
Title: Trasportatore a soffitto
Inventor: YAMAGUCHI YOSHIAKI
IPC: B65H67/06
Filed: 1993-03-04
Granted: 1997-06-10
Abstract: Un trasportatore a soffitto in grado di erogare una bobina di filato di genere specifico ad una posizione prefissata in modo che il trasportatore a soffitto che reca bobine di vari generi sia esente da interferenze con bobine aggiuntive o simili già posizionate in una stazione erogatrice; il trasportatore a soffitto avendo una base elevatrice con una pluralità di mandrini per bobine ad essa sospesi ed in grado di percorrere una rotaia, in cui ciascuno dei mandrini è previsto mobile su e giù rispetto alla base elevatrice così da abbassare selettivamente la bobina di genere specifico.
Patent IT-1269739-B (IT)
Inventor: LOMNICZI BELA
IPC: A61K39/245
Filed: 1994-05-10
Granted: 1997-04-15
Abstract: A vaccine against pig pseudorabies prepared from a viral strain derived from the ricombination of the Bartha K61 strain carrying the genetic marker Kpn F1 + F2 is described.
Patent IT-1274427-B (IT)
Title: Machine for preparing lengths of fabric, of predetermined dimensions, without creating structural tensions in the fabric itself
Inventor: GIACHETTI FRANCO
IPC: A41H/
Filed: 1995-05-04
Granted: 1997-07-17
Abstract: The subject of the present invention is a machine for preparing lengths of fabric, of predetermined dimensions, without creating structural tensions in the fabric itself, characterised in that it comprises a support structure of a mat for the preliminary arrangement of at least one length of fabric, of predetermined dimensions, downstream from which is placed a cutting mat, acted upon by a cutting head, slaved to a unit for controlling the movements of the cutting mat. Upstream from the preliminary mat is provided a fabric feeding assembly, the fabric being unwound from a reel. <IMAGE>
Patent IT-1272250-B (IT)
Title: Improved ironing device having motorised rotating cylinder with support and ironing element
Inventor: FERRARA GIOVANNI
IPC: D06F/
Filed: 1994-05-13
Granted: 1997-06-16
Abstract: Apparatus for ironing with rotating heated element, comprising a fixed plane and a hollow metal cylinder, able to turn loosely about its own axis, supported by a frame whose axis supports the heating elements inside the cylinder, with the heated cylinder which acts on an underlying element operating in concert with it such that the garments being ironed pass between the heated cylinder and said co-operating element, comprising motor means which move said heated cylinder and said element co- operating with it in relative motion. <IMAGE>
Patent IT-1245429-B (IT)
Title: Giunto elastico
Inventor: KUHNE VIKTOR
IPC: F16F15/123
Filed: 1991-03-01
Granted: 1994-09-20
Abstract: L'invenzione riguarda un giunto elastico, in particolare un volano a due masse inserito nel sistema di comando di un autoveicolo, entrambe le mezze parti del giunto sono collegate con accoppiamento elastico di torsione per mezzo di blocchi di molle disposti in senso circonferenziale. I blocchi di molle sono formati in tal caso da almeno due molle, le quali sono disposte una di seguito all'altra con disposizione attiva e vengono inserite in serie con accoppiamento dinamico. Una delle molle presenta a tale scopo di preferenza solamente una singola spira, di guisa che questa dopo aver raggiunto lo spostamento elastico massimo, forma un singolo piano, sul quale appoggia staticamente la molla adiacente. La prima molla ha una rigidezza inferiore per il funzionamento al minimo e ha solo una lunghezza ridotta. Il vano di montaggio all'interno del giunto è quindi disponibile senza impedimenti rilevanti da parte della prima molla, per la seconda molla (campo di funzionamento principale). I vantaggi dell'invenzione sono un peso ridotto e un minore ingombro di spazio, come pure la possibilità di effettuare in modo semplice modifiche nel gruppo delle molle.
Patent IT-1246071-B (IT)
Title: Insert support for packaging mechanical components, particularly vehicle rims
Inventor: ALLOESIO MAURO
IPC: B65G/
Filed: 1991-05-24
Granted: 1994-11-07
Abstract: An insert support 3 for rims 2 for use on vehicles, which can be coupled by superimposition on other identical supports 3 with the interposition of rims 2 to define a pack or packaging 1 of the same. The insert support 3 is defined by a plurality of first crosspieces 4 arranged parallel to each other, and a plurality of second crosspieces 5, these also parallel to each other and normal to said first crosspieces 4, and aligned and spaced one from another with a defined pitch; the first 4 and second crosspieces 5 being constrained to one another in a disengageable manner in correspondence with the points of overlapping to form a symmetrical frame structure, and each of these being shaped in such a way as to present a pair of shoulders 9', 9" arranged from opposite bands of each of the points of overlap, the shoulders 9', 9" relative to the same point of overlap of said crosspieces 4, 5 defining a locator and reference for a relative rim 2. <IMAGE>
Patent IT-1257176-B (IT)
Title: Mulino per macinazione di cereali con motore a basso consumo energetico.
IPC: B02C/
Filed: 1992-11-02
Granted: 1996-01-05
Abstract: Mulino per la macinazione di cereali, caratterizzato da un rotore a basso consumo energetico, provvisto di almeno due bracci radiali, ciascuno dei quali alla propria estremità libera porta una appendice allargata, avente nella direzione parallela all'asse di rotazione un'area della sezione maestra sostanzialmente più estesa di quella del braccio.I martelli del rotore, secondo la tecnica nota, presentano una sezione maestra elevata e mal distribuita. In effetti, al momento della macinazione del cereale essi lavorano solo alle estremità, per il fatto che il cereale circola all'interno della griglia descrivendo una traiettoria circolare radente alla griglia. I martelli del rotore della presente invenzione presentano una sezione maestra ridotta e situata solo in quella zona del rotore dove ha un'effettiva utilità per la macinazione. Eliminando dai martelli la sezione maestra inutile alla macinazione, le perdite per attrito aerodinamico vengono ridotte e quindi l'energia consumata cala.
Patent IT-1270416-B (IT)
Title: Elettrodo per l'applicazione delle correnti ad alta frequenza, per avvolgimento o per bendaggio delle parti da trattare
Inventor: TRON EMANUELE
IPC: H02M/
Filed: 1993-06-03
Granted: 1997-05-05
Abstract: Elettrodo (A) di grandi dimensioni (lenzuolino o banda), di minimo spessore, adatto all'applicazione sulla superficie del corpo, per avvolgimento o bendaggio della parti da trattare, delle correnti ad alta frequenza, nel campo dell'estetica, del dimagrimento, della medicina e di altre terapie salutari, e che non richiede l'intervento manuale dell'operatore durante il suo utilizzo. L'elettrodo A è costituito da un film in materiale isolante (I) metallizzato su una della sue facciate (2). Per l'applicazione, l'elettrodo A avvolgerà la zona del corpo da trattare con l'altra sua facciata (3), e per essere attivato, sarà posto a contatto di un elettrodo primario (B), o nel campo di azione da esso generato, costituito da una anima in materiale conduttore (4) sistemata fra due strati di materiale isolante (5 e 6) in connessione con la corrente di alta frequenza prodotta da un generatore (7).
Patent IT-1257594-B (IT)
Title: Procedure for making curved parts, especially when forming window frames and the panel so obtained
IPC: A47B/
Filed: 1992-06-19
Granted: 1996-02-01
Abstract: Procedure for making curved parts, especially when forming window frames and the panel so obtained, starting from a finished semi-manufactured panel consisting in: removing material from along the panel on at least one plane surface, the said hollow being obtained along a transverse section consisting of a base and laterally of a number of shelves fitted longitudinally to correspond with every ledge thereby obtained; inserting inside the said hollow sheets of wood or wood substitute, previously coated with adhesive, and having various sizes, at least as many as the various interaxes running between the coplanar shelves formed on opposite sides of the said ledges of the panel; fastening a sheet of external plastic laminate to cover the laminated structure thus obtained and then, inserting the panel thus obtained into a press and die to be kept in a mould until the curved structure is obtained. <IMAGE>
Patent NO-119613-B (NO)
Inventor: HENRIKSSON S
IPC: B27K3/32
Filed: 1967-10-27
Abstract: 1,174,960. Preserving wood &c. BOLIDEN A.B. 30 Oct., 1967 [28 Oct., 1966], No. 49254/ 67. Heading A5E. [Also in Divisions C1 and D1] A composition for preserving wood and other organic material contains compounds of phosphoric acid, hexavalent chromium and copper in such proportions that, upon reaction of the composition in the wood or organic material, phosphates of copper and chromium are formed as preserving agents active in the impregnated material, said proportions lying in a three component diagram (according to Fig. 1 of the accompanying drawings) within the corner point co-ordinates 18.3% and 64.1% by weight phosphorus and 50.2% and 89.2% by weight copper on respective axes. The composition may contain the compound: 3CuO-2CrO 3 -P 2 O 5 -5H 2 O. The composition may also contain up to 10% by weight H 2 SO 4  and/or HNO 3 .
Patent PT-115405-B (PT)
Title: Sistema de gestão e balanceamento ativo da carga das baterias para veículos elétricos
Inventor: JOÃO LUIZ AFONSO
IPC: H02J7/00
Filed: 2019-03-25
Abstract: A PRESENTE DIVULGAÇÃO REFERE-SE A UM SISTEMA DE GESTÃO E BALANCEAMENTO ATIVO DA CARGA DE BATERIAS PARA VEÍCULO ELÉTRICO, QUE COMPREENDE: UMA BATERIA DE SERVIÇO; UMA BATERIA DE CÉLULAS; UM BARRAMENTO DE CORRENTE CONTÍNUA, DITA CC; UM BARRAMENTO DE COMUNICAÇÃO DIGITAL; UM MÓDULO PRIMÁRIO PARA LIGAÇÃO À BATERIA DE SERVIÇO, QUE COMPREENDE UM MICROCONTROLADOR PARA CONTROLO DO SISTEMA E LIGADO À BATERIA DE SERVIÇO, UM TRANSMISSOR-RECETOR LIGADO AO BARRAMENTO DE COMUNICAÇÃO DIGITAL E LIGADO À BATERIA DE SERVIÇO; UMA PLURALIDADE DE MÓDULOS SECUNDÁRIOS PARA LIGAÇÃO À BATERIA DE CÉLULAS, EM QUE CADA MÓDULO SECUNDÁRIO COMPREENDE UM CONVERSOR DE CORRENTE CC-CC BIDIRECIONAL DE TRANSFORMADOR DE RETORNO, DITO FLYBACK, DE ALTA FREQUÊNCIA LIGADO ENTRE UMA CÉLULA DA BATERIA DE CÉLULAS E O BARRAMENTO CC, UM TRANSMISSOR-RECETOR LIGADO AO BARRAMENTO DE COMUNICAÇÃO DIGITAL, UM MICROCONTROLADOR QUE COMPREENDE UMA LIGAÇÃO À REFERIDA CÉLULA, UMA LIGAÇÃO DE CONTROLO AO CONVERSOR CC-CC, E UMA LIGAÇÃO DE CONTROLO AO TRANSMISSOR-RECETOR DO MÓDULO SECUNDÁRIO; EM QUE O MICROCONTROLADOR DO MÓDULO PRIMÁRIO E OS MICROCONTROLADORES DOS MÓDULOS SECUNDÁRIOS ESTÃO CONFIGURADOS PARA COMUNICAREM ENTRE SI ATRAVÉS DOS RESPETIVOS TRANSMISSORES-RECETORES PARA BALANCEAMENTO ATIVO DA CARGA E DESCARGA DAS REFERIDAS CÉLULAS.
Patent PT-116297-B (PT)
Title: Uso da terapia fotodinâmica para controlo do agente fitopatogénico pseudomonas syringae pv. actinidiae no pólen do kiwi
Inventor: MARIA DO AMPARO FERREIRA FAUSTINO
IPC: A01N59/00
Filed: 2020-04-25
Abstract: A PRESENTE INVENÇÃO DIZ RESPEITO À INATIVAÇÃO DO MICRORGANISMO PSEUDOMONAS SYRINGAE PV. ACTINIDIAE (PSA), AGENTE FITOPATOGÉNICO DA PLANTA DO KIWI, COM RECURSO À TERAPIA FOTODINÂMICA (TF). A TF BASEIA-SE NA ATUAÇÃO COMBINADA DE TRÊS COMPONENTES ¿ MOLÉCULA DE FOTOSSENSIBILIZADOR, OXIGÉNIO MOLECULAR E LUZ ¿ QUE ATRAVÉS DE PROCESSOS FOTOFÍSICOS E FOTOQUÍMICOS PRODUZ ESPÉCIES REATIVAS DE OXIGÉNIO (OXIGÉNIO SINGLETO, RADICAIS HIDROXILO, ANIÃO RADICAL SUPERÓXIDO, ENTRE OUTRAS), QUE IRÃO AFETAR/DANIFICAR AS ESTRUTURAS BIOLÓGICAS DOS MICRORGANISMOS DE FORMA SEVERA, DESTRUINDO-OS. DESTA FORMA, O PROCESSO APLICADO AO PÓLEN PERMITE A INATIVAÇÃO DA PSA, IMPEDINDO QUE ESTE AGENTE FITOPATOGÉNICO SEJA TRANSMITIDO ATRAVÉS DO PÓLEN À PLANTA DO KIWI E SE PROPAGUE GEOGRAFICAMENTE.
Patent TW-209228-B (TW)
IPC: C08F4/658
Filed: 1991-03-21
Granted: 1993-07-11
Abstract: The present invention relates to a catalyst and a process for preparing a catalyst suitable for polymerization of olefins. The process is carried out in a hydrocarbon liquid medium and comprises successively contacting a refractory oxide support with (a) a dialkylmagnesium optionally with a trialkylaluminium, (b) a particular monochloro organic compound, (c) a titanium and/or vanadium compound(s), and then (d) with ethylene optionally mixed with a C3-C8 alpha-olefin in the presence of an organo-aluminium or organozinc compound to form a prepolymerised catalyst. The catalyst has a high activity, particularly in a gas phase polymerization of ethylene, and has a great ability of copolymerizing alpha-olefins with ethylene.