EP0056941A2 - Support for blast furnace probe - Google Patents

Support for blast furnace probe Download PDF

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Publication number
EP0056941A2
EP0056941A2 EP82100131A EP82100131A EP0056941A2 EP 0056941 A2 EP0056941 A2 EP 0056941A2 EP 82100131 A EP82100131 A EP 82100131A EP 82100131 A EP82100131 A EP 82100131A EP 0056941 A2 EP0056941 A2 EP 0056941A2
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EP
European Patent Office
Prior art keywords
support
probe
block
bore
furnace
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Granted
Application number
EP82100131A
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German (de)
French (fr)
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EP0056941B1 (en
EP0056941A3 (en
EP0056941B2 (en
Inventor
Pierre Mailliet
Victor Kremer
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Paul Wurth SA
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Paul Wurth SA
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Application filed by Paul Wurth SA filed Critical Paul Wurth SA
Priority to AT82100131T priority Critical patent/ATE15388T1/en
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Publication of EP0056941A3 publication Critical patent/EP0056941A3/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices

Definitions

  • the present invention relates to a support for a blast furnace probe which is introduced horizontally through an opening provided in the side wall of the blast furnace, this side wall consisting of a metal shield and an inner coating of refractory material.
  • These probes are intended to measure the temperature at different predetermined points inside the oven and to take gas samples for analysis. The result of these measurements and analyzes allows monitoring and control of the operation of the oven.
  • probes There are two different types of such probes. Some are arranged above the loading material and remain there permanently. The others are introduced into the loading material itself and are extracted again after the samples have been taken.
  • these probes In order to provide as complete and precise information as possible, these probes must penetrate into the region of the central axis of the furnace. Therefore, depending on the capacity of the oven, these probes must be up to eight meters in length and sometimes even more. This results in serious support problems which become all the more difficult as the probes are longer. Indeed, these probes are cantilevered with the only support point a flange provided on the metal shielding of the wall of the oven for the introduction of these probes. These are therefore exposed to the risk of deformation under the action of their own weight and under the action of the descent of the material inside the oven. In addition, the support point of the probe undergoes the reaction of these forces and stresses, reaction proportional to the moments exerted by the length of the probe overhang. This reaction is maximum when the probe is fully inserted and the resulting frictional force on the support opposes the sliding of the probe. The effort required to move the probe is adversely affected.
  • the object of the present invention is to provide a support for a probe which makes it possible to reduce the drawbacks and problems caused by the cantilevered suspension of the probe.
  • the present invention presents a support for a probe of the type described above, characterized by a block fixed on a flange provided for this purpose on the metal shielding, this block being provided with an axial bore to allow the passage of the probe and of a support extending this bore towards the interior of the oven at least up to beyond half the thickness of the refractory lining.
  • the inner end of the support is provided with a hardfacing of a hard and refractory steel, that is to say having anti-abrasive and heat-resistant characteristics, on which the probe slides.
  • the present invention provides a probe whose support is offset towards the interior of the furnace, in comparison with the support of existing probes, which makes it possible to reduce in this way the length of the overhang.
  • the invention thus makes it possible to gain approximately 80-100 cm, which, taking into account the fact that the length of overhang intervenes at the third power for the determination of the deformations, constitutes a non-negligible progress.
  • the support of the probe is preferably in the form of a trough whose curvature corresponds to that of the bore of the support block.
  • a cooling water circulation is provided through the support and the support block.
  • FIG. 1 schematically shows a probe 10 in the measurement position introduced into the loading material of a furnace, the wall of which is constituted by an external metal shield 12 and an interior refractory lining 14.
  • This probe 10 is introduced through an opening 18 provided in the shield 12 and the refractory lining 14.
  • the shield 12 is provided with a flange 20 around this opening 18 for fixing a support 22 according to the present invention.
  • On the support 22 is located, on the outside, a valve 16 known per se, intended to close the opening abandoned after the extraction of the probe 10 from the oven.
  • the support 22 proposed by the invention essentially comprises a block 24 occupying the space delimited by the flange 20 of the shielding 12, and a support 26 extending in the opening 18 at least beyond half of the thickness of the refractory lining 14.
  • the block 22 is fixed, in a manner known per se, for example by means of bolts not shown on the flange 20.
  • the block 24 has a central bore 30 whose diameter is slightly greater than that of the probe 10 to allow passage of the latter.
  • This bore 30 is extended, in part, by the support 26, the upper face of which is in the shape of a trough, with a curvature corresponding to that of the bore 30.
  • On the inner end of the support 26 is provided a reloading 28 in hard and refractory steel on which the probe 10 rests and slides. Reloading 28 formed by this weld is the only lower support of the probe 10 and determines the length "L" of the probe overhang.
  • the support 22 proposed by the invention has made it possible to increase the length "1" in favor of the length "L” and by modifying the ratio "y", the invention allows a significant reduction in the reactions at the two support points 28 and 32.
  • the support 22 is provided with an inlet 34 and an outlet 36 for the circulation of a coolant.
  • the body of the block 24 and of the support 26 are hollow and the coolant is brought directly from the inlet 34 to the inner end of the support 26 from which it returns to the hollow from block 24 to exit through orifice 36.
  • the support 22 includes an inlet orifice 38 designed to be connected to a pressure air line not shown and opening into a circular chamber 40 communicating by a circular slot 42 with the bore 30.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Blast Furnaces (AREA)
  • Manufacture Of Iron (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

A horizontally movable sampling probe, for insertion into and retraction from a blast furnace, is supported in an aperture in the furnace wall. The support mechanism for the probe includes a fluid cooled guide block attached to the furnace shell and having a support portion extending toward the furnace interior at least part way through the refractory furnace wall lining.

Description

La présente invention concerne un support pour une sonde de haut fourneau qui est introduite horizontalement à travers une ouverture prévue dans la paroi latérale du haut fourneau, cette paroi latérale étant constituée d'un blindage métallique et d'un revêtement intérieur en matière réfractaire.The present invention relates to a support for a blast furnace probe which is introduced horizontally through an opening provided in the side wall of the blast furnace, this side wall consisting of a metal shield and an inner coating of refractory material.

Ces sondes sont destinées à mesurer la température à différents-points prédéterminés à l'intérieur du four et à prélever des échantillons gazeux pour les analyser. Le résultat de ces mesures et analyses permet la surveillance et le contrôle de la marche du four.These probes are intended to measure the temperature at different predetermined points inside the oven and to take gas samples for analysis. The result of these measurements and analyzes allows monitoring and control of the operation of the oven.

Il existe deux types différents de telles sondes. Les unes sont disposées au-dessus de la matière de chargement et y demeurent en permanence. Les autres sont introduites dans la matière de chargement même et sont à nouveau extraites après le prélèvement des échantillons.There are two different types of such probes. Some are arranged above the loading material and remain there permanently. The others are introduced into the loading material itself and are extracted again after the samples have been taken.

Afin de pouvoir fournir des renseignements aussi complets et précis que possibles, ces sondes doivent pénétrer jusque dans la région de l'axe central du four. Par conséquent, suivant la capacité du four, ces sondes doivent avoir jusqu'à huit mètres de longueur et parfois même plus. Il en résulte de sérieux problèmes de support qui deviennent d'autant plus difficiles que les sondes sont plus longues. En effet, ces sondes se trouvent en porte-à-faux avec comme seul point d'appui une bride prévue sur le blindage métallique de la paroi du four pour l'introduction de ces sondes. Celles-ci sont par conséquent exposées à des risques de déformations sous l'action de leur propre poids et sous l'action de la descente de la matière à l'intérieur du four. En outre, le point de support de la sonde subit la réaction de ces efforts et sollicitations, réaction proportionnelle aux moments exercés par la longueur de porte-à-faux de la sonde. Cette réaction est maximale lorsque la sonde est complètement enfoncée et la force de frottement qui en résulte au niveau du support s'oppose au glissement de la sonde. L'effort nécessaire au déplacement de la sonde en subit les conséquences néfastes.In order to provide as complete and precise information as possible, these probes must penetrate into the region of the central axis of the furnace. Therefore, depending on the capacity of the oven, these probes must be up to eight meters in length and sometimes even more. This results in serious support problems which become all the more difficult as the probes are longer. Indeed, these probes are cantilevered with the only support point a flange provided on the metal shielding of the wall of the oven for the introduction of these probes. These are therefore exposed to the risk of deformation under the action of their own weight and under the action of the descent of the material inside the oven. In addition, the support point of the probe undergoes the reaction of these forces and stresses, reaction proportional to the moments exerted by the length of the probe overhang. This reaction is maximum when the probe is fully inserted and the resulting frictional force on the support opposes the sliding of the probe. The effort required to move the probe is adversely affected.

Jusqu'à présent, il n'était pas possible de surmonter ces difficultés, car la nécessité d'effectuer des mesures et analyses dans la région de l'axe du four interdit une diminution de la longueur de la sonde, même en sa- chant que la déformation à l'extrémité intérieure est proportionnelle à la troisième puissance de la longueur de porte-à-faux, comme le prouvent les lois de la mécanique statique.Until now, it has not been possible to mounting these difficulties, because the need to carry out measurements and analyzes in the region of the furnace axis prevents a reduction in the length of the probe, even knowing that the deformation at the inner end is proportional to the third power of the length of overhang, as proven by the laws of static mechanics.

Le but de la présente invention est de prévoir un support pour une sonde qui permet de réduire les inconvénients et problèmes causés par la suspension en porte-à-faux de la sonde.The object of the present invention is to provide a support for a probe which makes it possible to reduce the drawbacks and problems caused by the cantilevered suspension of the probe.

Pour atteindre cet objectif, la présente invention présente un support pour une sonde du type décrit ci- dessus, caractérisé par un bloc fixé sur une bride prévue à cet effet sur le blindage métallique, ce bloc étant pourvu d'un alésage axial pour permettre le passage de la sonde et d'un appui prolongeant cet alésage vers l'intérieur du four au moins jusqu'au-delà de la moitié de l'épaisseur du revêtement réfractaire.To achieve this objective, the present invention presents a support for a probe of the type described above, characterized by a block fixed on a flange provided for this purpose on the metal shielding, this block being provided with an axial bore to allow the passage of the probe and of a support extending this bore towards the interior of the oven at least up to beyond half the thickness of the refractory lining.

Selon un mode de réalisation avantageux, l'extrémité intérieure de l'appui est pourvue d'un rechargement par soudure d'un acier dur et réfractaire, c'est-à-dire ayant des caractéristiques anti-abrasives et résistant à la chaleur, sur lequel glisse la sonde.According to an advantageous embodiment, the inner end of the support is provided with a hardfacing of a hard and refractory steel, that is to say having anti-abrasive and heat-resistant characteristics, on which the probe slides.

La présente invention propose une sonde dont l'appui est décalé vers l'intérieur du four, en comparaison avec l'appui des sondes existantes, ce qui permet de réduire de cette manière la longueur de porte-à-faux. L'invention permet ainsi de gagner environ 80-100 cm, ce qui, compte tenu du fait que la longueur de porte-à-faux intervient à la troisième puissance pour la détermination des déformations, constitue un progrès non négligeable. Ainsi, par exemple, la flèche résultant du poids propre de la sonde, se réduit, pour une di- 1 minution de 5 à 4 mètres du porte-à-faux, à

Figure imgb0001
.
Figure imgb0002
 = 0,8
Figure imgb0003
 = 0,40 soit 40 % de la flèche d'un porte-à-faux de 5 m.The present invention provides a probe whose support is offset towards the interior of the furnace, in comparison with the support of existing probes, which makes it possible to reduce in this way the length of the overhang. The invention thus makes it possible to gain approximately 80-100 cm, which, taking into account the fact that the length of overhang intervenes at the third power for the determination of the deformations, constitutes a non-negligible progress. For example, the deflection resulting from the own weight of the probe is reduced to a di- 1 m i nu tion 5 in 4 m of the cantilever, to
Figure imgb0001
 .
Figure imgb0002
 = 0.8
Figure imgb0003
 = 0.40 or 40% of the deflection of a 5 m overhang.

L'appui de la sonde est de préférence en forme d'auge dont la courbure correspond à celle de l'alésage du bloc de support.The support of the probe is preferably in the form of a trough whose curvature corresponds to that of the bore of the support block.

Selon un mode de réalisation avantageux, il est prévu une circulation d'eau de refroidissement à travers l'appui et le bloc du support.According to an advantageous embodiment, a cooling water circulation is provided through the support and the support block.

Il est également avantageux de prévoir un système d'injection d'air sous pression pour éviter des dépôts de poussières sur l'appui et dans l'alésage du bloc.It is also advantageous to provide a pressurized air injection system to avoid deposits of dust on the support and in the bore of the block.

D'autres particularités et caractéristiques ressortiront de la description détaillée d'un mode de réalisation avantageux présenté ci-dessous, à titre d'illustration, en référence aux dessins, dans lesquels :

  • La figure 1 représente schématiquement une coupe longitudinale à travers une sonde en position opérative et
  • La figure 2 montre schématiquement les détails du support de sonde montré à la figure 1.
Other particularities and characteristics will emerge from the detailed description of an advantageous embodiment presented below, by way of illustration, with reference to the drawings, in which:
  • FIG. 1 schematically represents a longitudinal section through a probe in the operative position and
  • Figure 2 schematically shows the details of the probe holder shown in Figure 1.

La figure 1 montre schématiquement une sonde 10 en position de mesure introduite dans la matière de chargement d'un fourneau dont la paroi est constituée par un blindage métallique extérieur 12 et un revêtement réfractaire intérieur 14. Cette sonde 10 est introduite à travers une ouverture 18 prévue dans le blindage 12 et le revêtement réfractaire 14. Le blindage 12 est pourvu d'une bride 20 autour de cette ouverture 18 pour la fixation d'un support 22 selon la présente invention. Sur le support 22 se trouve, du côté extérieur, une vanne 16 connue en soi, destinée à fermer l'ouverture délaissée après l'extraction de la sonde 10 hors du four.FIG. 1 schematically shows a probe 10 in the measurement position introduced into the loading material of a furnace, the wall of which is constituted by an external metal shield 12 and an interior refractory lining 14. This probe 10 is introduced through an opening 18 provided in the shield 12 and the refractory lining 14. The shield 12 is provided with a flange 20 around this opening 18 for fixing a support 22 according to the present invention. On the support 22 is located, on the outside, a valve 16 known per se, intended to close the opening abandoned after the extraction of the probe 10 from the oven.

Le support 22 proposé par l'invention comporte essentiellement un bloc 24 occupant l'espace délimité par la bride 20 du blindage 12, et un appui 26 s'étendant dans l'ouverture 18 au moins jusqu'au-delà de la moitié de l'épaisseur du revêtement réfractaire 14. Le bloc 22 est fixé, de manière connue en soi, par exemple au moyen de boulons non représentés sur la bride 20.The support 22 proposed by the invention essentially comprises a block 24 occupying the space delimited by the flange 20 of the shielding 12, and a support 26 extending in the opening 18 at least beyond half of the thickness of the refractory lining 14. The block 22 is fixed, in a manner known per se, for example by means of bolts not shown on the flange 20.

Le bloc 24 comporte un alésage central 30 dont le diamètre est légèrement supérieur à celui de la sonde 10 pour permettre le passage de celle-ci. Cet alésage 30 est prolongé, en partie, par l'appui 26 dont la face supérieure est en forme d'auge, avec une courbure correspondant à celle de l'alésage 30. Sur l'extrémité intérieure de l'appui 26 est prévu un rechargement 28 en acier dur et réfractaire sur lequel repose et glisse la sonde 10. Le rechargement 28 formé par cette soudure constitue le seul appui inférieur de la sonde 10 et détermine la longueur "L" de porte-à-faux de la sonde. Du côté extérieur, à une distance "1" du rechargement 28 se trouve un second appui 32 qui est un appui supérieur.The block 24 has a central bore 30 whose diameter is slightly greater than that of the probe 10 to allow passage of the latter. This bore 30 is extended, in part, by the support 26, the upper face of which is in the shape of a trough, with a curvature corresponding to that of the bore 30. On the inner end of the support 26 is provided a reloading 28 in hard and refractory steel on which the probe 10 rests and slides. Reloading 28 formed by this weld is the only lower support of the probe 10 and determines the length "L" of the probe overhang. On the outside, at a distance "1" from the recharging 28, there is a second support 32 which is an upper support.

Le support 22 proposé par l'invention a permis d'augmenter la longueur "1" au profit de la longueur "L" et en modifiant le rapport "y", l'invention permet une diminution sensible des réactions aux deux points d'appui 28 et 32.The support 22 proposed by the invention has made it possible to increase the length "1" in favor of the length "L" and by modifying the ratio "y", the invention allows a significant reduction in the reactions at the two support points 28 and 32.

Comme montré sur la figure 2, le support 22 est pourvu d'une entrée 34 et d'une sortie 36 pour la circulation d'un liquide de refroidissement. A cet effet, le corps du bloc 24 et de l'appui 26 sont creux et le liquide de refroidissement est amené directement de l'entrée 34 jusqu'à l'extrémité intérieure de l'appui 26 d'où il retourne dans le creux du bloc 24 pour sortir par l'orifice 36.As shown in Figure 2, the support 22 is provided with an inlet 34 and an outlet 36 for the circulation of a coolant. For this purpose, the body of the block 24 and of the support 26 are hollow and the coolant is brought directly from the inlet 34 to the inner end of the support 26 from which it returns to the hollow from block 24 to exit through orifice 36.

Pour éviter les dépôts de poussières et saletés dans l'alésage 30 et sur l'appui 26, il est également prévu un système d'injection d'un fluide de rinçage, par exemple de l'air sous pression. A cet effet, le support 22 comporte un orifice d'admission 38 conçu pour être branché sur une conduite d'air sous pression non montrée et débouchant dans une chambre circulaire 40 communiquant par une fente circulaire 42 avec l'alésage 30.To avoid deposits of dust and dirt in the bore 30 and on the support 26, there is also provided a system for injecting a rinsing fluid, for example pressurized air. To this end, the support 22 includes an inlet orifice 38 designed to be connected to a pressure air line not shown and opening into a circular chamber 40 communicating by a circular slot 42 with the bore 30.

Il est évident que le support proposé par l'invention est aussi bien adaptable aux sondes se trouvant au-dessus du lit de fusion qu'à celles conçues pour être introduites dans la matière de chargement.It is obvious that the support proposed by the invention is as well adaptable to the probes located above the fusion bed as to those designed to be introduced into the loading material.

Claims (5)

1. - Support pour une sonde de haut fourneau qui est introduite horizontalement à travers une ouverture prévue dans la paroi latérale du haut fourneau, cette paroi latérale étant constituée d'un blindage métallique et d'un revêtement intérieur en matière réfractaire, caractérisé par un bloc (24) fixé sur une bride (20) prévue à cet effet sur le blindage métallique (12), ce bloc (24) étant pourvu d'un alésage axial (30) pour permettre le passage de la sonde (10) et d'un appui (26) prolongeant cet alésage (30) vers l'intérieur du four, au moins jusqu'au delà de la moitié de l'épaisseur du revêtement réfractaire (14).1. - Support for a blast furnace probe which is introduced horizontally through an opening provided in the side wall of the blast furnace, this side wall consisting of a metal shield and an inner coating of refractory material, characterized by a block (24) fixed on a flange (20) provided for this purpose on the metal shield (12), this block (24) being provided with an axial bore (30) to allow the passage of the probe (10) and d 'A support (26) extending this bore (30) towards the interior of the furnace, at least up to more than half the thickness of the refractory lining (14). 2. - Support selon la revendication 1, caractérisé en ce que l'extrémité intérieure de l'appui (26) est pourvue d'un rechargement (28.) en matière réfractaire sur lequel glisse la sonde (10).2. - Support according to claim 1, characterized in that the inner end of the support (26) is provided with a reload (28.) of refractory material on which slides the probe (10). 3. - Support selon l'une des revendications 1 ou 2, caractérisé en ce que l'appui (26) est en forme d'auge dont la courbure correspond à celle de l'alésage (30) du bloc (24) de support.3. - Support according to one of claims 1 or 2, characterized in that the support (26) is in the form of a trough whose curvature corresponds to that of the bore (30) of the support block (24) . 4. - Support selon l'une quelconque des revendications 1 à 3, caractérisé par un système de circulation d'un liquide de refroidissement (34, 36) à travers l'appui (26) et le bloc (24) du support.4. - Support according to any one of claims 1 to 3, characterized by a system for circulating a coolant (34, 36) through the support (26) and the block (24) of the support. 5. - Support selon l'une quelconque des revendications 1 à 4, caractérisé par un système d'injection d'air sous pression (38, 40, 42) pour éviter des dépôts de poussières sur l'appui (26) et dans l'alésage (30) du bloc (24).5. - Support according to any one of claims 1 to 4, characterized by a pressurized air injection system (38, 40, 42) to avoid deposits of dust on the support (26) and in the '' bore (30) of the block (24).
EP82100131A 1981-01-23 1982-01-11 Support for blast furnace probe Expired - Lifetime EP0056941B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82100131T ATE15388T1 (en) 1981-01-23 1982-01-11 SUPPORT FOR A BLAST FURNACE PROBE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU83086A LU83086A1 (en) 1981-01-23 1981-01-23 SUPPORT FOR A BLAST FURNACE PROBE
LU83086 1981-01-23

Publications (4)

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EP0056941A2 true EP0056941A2 (en) 1982-08-04
EP0056941A3 EP0056941A3 (en) 1982-08-18
EP0056941B1 EP0056941B1 (en) 1985-09-04
EP0056941B2 EP0056941B2 (en) 1990-12-27

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US (1) US4471664A (en)
EP (1) EP0056941B2 (en)
AT (1) ATE15388T1 (en)
CA (1) CA1190396A (en)
DE (1) DE3265919D1 (en)
LU (1) LU83086A1 (en)

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AU579492B2 (en) * 1985-09-30 1988-11-24 Paul Wurth S.A. Device for the movement of a shaft furnace probe

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US4594903A (en) * 1984-11-19 1986-06-17 Ethylene Corp Dip tube sampling means for chemical reactors
FR2600758B1 (en) * 1986-06-27 1988-10-07 Siderurgie Fse Inst Rech METHOD OF AXIAL ALIGNMENT OF AN ASSEMBLY OF A PARIETAL PROBE IN A MELT-REDUCTION OVEN AND ASSOCIATED ASSEMBLY ASSEMBLY
GB8623834D0 (en) * 1986-10-03 1986-11-05 Baker Perkins Plc Sampling contents of pressurised vessels
US4860603A (en) * 1988-12-05 1989-08-29 Fabio Russoniello Convection cooling probe mounting jacket
AT395984B (en) * 1991-07-16 1993-04-26 Voest Alpine Ind Anlagen DEVICE FOR KEEPING A METALURGICAL VESSEL'S LANE OPENING
LU88279A1 (en) * 1993-05-27 1994-12-01 Wurth Paul Sa Device for introducing a slender lance into a pressure tank, in particular a blast furnace
LU88280A1 (en) * 1993-05-27 1994-12-01 Wurth Paul Sa Device for introducing a lance into a pressure tank, in particular a blast furnace
US6131473A (en) * 1998-05-28 2000-10-17 Bethlehem Steel Corporation Retractable humidity sensor for use in corrosion test chambers
JP5764008B2 (en) * 2010-08-31 2015-08-12 電源開発株式会社 Furnace temperature measuring device

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US3130584A (en) * 1961-02-14 1964-04-28 United States Steel Corp Blast furnace probe
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LU65998A1 (en) * 1972-09-05 1973-01-17
JPS5433927Y2 (en) * 1975-10-30 1979-10-18
US4283947A (en) * 1979-09-10 1981-08-18 Kennecott Copper Corporation Self cleaning, steam cooled, gas sample probe

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SU171864A1 (en) * DEVICE FOR INPUT OF A RADIAL PROBE RADIAL PROBE
SU175061A1 (en) * Ф. В. Ашихмин, А. И. Дорман , Л. Я. Шпарбер DEVICE FOR MEASURING STATIC PRESSURE IN THE MINE OF THE DOMAIN FURNACE
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Also Published As

Publication number Publication date
EP0056941B1 (en) 1985-09-04
EP0056941A3 (en) 1982-08-18
DE3265919D1 (en) 1985-10-10
LU83086A1 (en) 1982-09-10
EP0056941B2 (en) 1990-12-27
CA1190396A (en) 1985-07-16
US4471664A (en) 1984-09-18
ATE15388T1 (en) 1985-09-15

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