EP0148337B1 - Brique pour lavage au gaz pour récipients métallurgiques - Google Patents

Brique pour lavage au gaz pour récipients métallurgiques Download PDF

Info

Publication number
EP0148337B1
EP0148337B1 EP84112404A EP84112404A EP0148337B1 EP 0148337 B1 EP0148337 B1 EP 0148337B1 EP 84112404 A EP84112404 A EP 84112404A EP 84112404 A EP84112404 A EP 84112404A EP 0148337 B1 EP0148337 B1 EP 0148337B1
Authority
EP
European Patent Office
Prior art keywords
gas
section
supply pipe
gas supply
metal cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84112404A
Other languages
German (de)
English (en)
Other versions
EP0148337A1 (fr
Inventor
Hans Dipl.-Ing. Höffgen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RADEX DEUTSCHLAND AKTIENGESELLSCHAFT FUER FEUERFES
Original Assignee
Brohltal-Deumag AG fur Feuerfeste Erzeugnisse
RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6214467&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0148337(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Brohltal-Deumag AG fur Feuerfeste Erzeugnisse, RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE filed Critical Brohltal-Deumag AG fur Feuerfeste Erzeugnisse
Priority to AT84112404T priority Critical patent/ATE26859T1/de
Publication of EP0148337A1 publication Critical patent/EP0148337A1/fr
Application granted granted Critical
Publication of EP0148337B1 publication Critical patent/EP0148337B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor

Definitions

  • the invention relates to a gas purging plug for metallurgical vessels consisting of a porous, gas-permeable molded block made of refractory material, a gas-tight partial casing surrounding it, which is welded together from a sheet metal jacket extending around the lateral peripheral surface of the molded block and a sheet metal cover covering the outer end face of the molded block, one Gas supply pipe, which is welded to the edge of a central gas inlet opening of the sheet metal cover, and a break-through protection in the area of the gas supply pipe.
  • Gas purging stones of the type mentioned which can be inserted into the bottom or the side walls of the vessels, are used for blowing inert gases into the melt to be treated.
  • the inert gas treatment offers various metallurgical advantages, for example the reduction of the temperature profile in the pan and thus a quick setting of the optimal casting temperature, a homogeneous distribution of the alloying agent or deoxidizing agent in the vessel, improvement of the degree of purity of the steel by transporting the non-metallic impurities, in the slag and partial removal of gases, stirring aid in metallurgical reactions to achieve concentration compensation of the melt and the like.
  • gas purging stones are preprogrammed wear parts
  • the gas purging stone technology is already so advanced that a single stone survives a larger number of batches.
  • the wear of the stones occurs primarily on the gas outlet side in contact with the melt. It can often be observed that melt enters the pores and clogs them in such a way that the outlet area of the flushing block is closed and so-called flushing misfires can occur.
  • the invention has for its object to prevent the gas purging plug from being blocked in the gas outlet area and thus to ensure that it is ready for purging.
  • this object is achieved in that a narrow cross section is provided in the gas supply pipe at a distance from the gas inlet opening of the sheet metal cover and in that a closure body which is movable at least in the axial direction of the gas supply pipe and whose cross section is smaller is arranged in the pipe section between the sheet metal cover and the narrowed cross section than the inner diameter of the gas supply pipe and larger than the narrowed cross section, the closure body 'forms a check valve together with the narrowed cross section.
  • the check valve closes immediately after the flushing process has ended, so that there is no pressure drop in the flushing plug and thus the melt does not penetrate into the pores of the flushing plug after the flushing process has ended.
  • the check valve also acts as a breakthrough protection.
  • the resistance of the purge material is strengthened, to which in particular the pressure gas cushion formed in the gas purge contributes. Due to the construction according to the invention, complex breakthrough safeguards can thus be dispensed with.
  • the valve body which is relatively large and can fill almost the entire free cross section of the gas supply pipe, is preferably made of copper. Copper is a material that can absorb large amounts of heat in a short time. If a melt breakthrough should occur in spite of the construction according to the invention, the melt penetrating into the gas supply pipe solidifies immediately upon contact with the closure body made of copper, so that an additional breakdown protection is thereby created.
  • the narrowed cross section provided in the gas supply pipe can be formed by a perforated disc, the central through opening of which forms the valve seat. Such a valve seat can be produced with little effort.
  • the pipe section between the sheet metal cover and the perforated disk and also the perforated disk can be made of stainless steel.
  • a compression spring can be provided between the closure body and the sheet metal cover, which presses the closure body against the valve seat. This measure ensures that the sink can be used in any position.
  • a sieve can be arranged in the area of the gas inlet opening of the sheet metal cover or somewhat below it, so that no refractory material that may crumble out of the sink material can get into the area of the valve seat.
  • the sieve can be in an annular perforated cap welded into the inner cross section of the gas supply pipe be attached, which can also be used as an abutment for the compression spring.
  • the valve body can be designed as a ball, which can best close the passage through the narrowed cross section.
  • the closure body as a solid, cylindrical part, the diameter of which is only slightly smaller than the inside diameter of the gas supply pipe and which on its side interacting with the narrowed cross section of the gas supply pipe has a tapering end piece which engages in the narrowed cross section.
  • the end piece is expediently frustoconical.
  • the cylindrical closure body can be equipped with a large, good heat-conducting mass, so that a spontaneous quenching effect of the penetrating melt is achieved in the event of a melt breakthrough, an additional seal being created by the melt solidified in the region of the closure body.
  • a central recess is expediently provided in the end face of the end of the cylindrical closure part facing away from the narrowed cross section, as a result of which the heat-conducting contact surface is enlarged compared to a possible penetrating melt and the quenching effect is thus further improved.
  • a ring made of refractory material can be arranged around the gas supply pipe, the outer diameter of which is expediently larger than the largest diameter of the shaped block and the ring with an axially projecting edge which overlaps the wider end of the shaped block on a perforated brick or the vessel lining can be applied.
  • the gas purging plug 1 consists of a frustoconical, gas-permeable molded block 2 which is inserted into the bottom or the wall of a metallurgical vessel not shown in the drawing.
  • a flushing gas for example argon, is introduced through the gas purging plug into the metal melt located in the metallurgical vessel.
  • the gas purging plug is a wearing part, which is replaced by a new gas purging plug after a certain number of batches.
  • the gas purging plug 1 is partially provided with a gas-tight sheet metal casing 3.
  • This consists of a tightly fitting sheet metal jacket 4 and a round sheet metal cover 6 which bears against the outer end face 5 of the shaped block and extends to the outer edge of the end face 5 of the shaped block.
  • the outer edge of the sheet metal jacket 4 is flanged around the sheet metal cover 6 and connected to the sheet metal cover in a gas-tight manner by a weld seam 7 which runs at a distance from the edge of the sheet metal cover 6.
  • the sheet metal cover 6 has a round gas inlet opening 8, which is provided with an axially projecting cylindrical edge 9.
  • a gas feed pipe 10 is inserted into the gas inlet opening 8 provided with the cylindrical edge 9, on the outer circumference of which the edge 9 of the gas inlet opening 8 is welded over a circumferential seam 11.
  • a narrowed cross section 12 is provided at a distance from the gas inlet opening 8 of the sheet metal cover 6, which is formed by a perforated disk 13.
  • the gas supply pipe 10 is of split design and consists of a first section 14 which is welded to the sheet metal cover 6 and a second section 15 adjoining it, to which the gas supply is connected.
  • the perforated disk 13 is inserted between the two pipe sections 14 and 15, and all three parts are connected to one another by a common circumferential weld seam 16.
  • the pipe section 14 adjoining the sheet metal cover 6 and the perforated disk 13 are made of rustproof stainless steel, so that in the interior of the pipe section 14, which is to serve as the valve receiving housing and valve seat, no troublesome corrosion can occur.
  • a relatively large copper ball 17 is used as the valve body, which is only slightly smaller than the inner cross section of the tube section 14. Together with the perforated disk 13, the ball 17 forms a check valve.
  • the ball 17 is lifted off the valve seat by the flushing gas flowing in via the second pipe section 15, so that the valve in the direction of flow of the flushing gas represents little or no resistance. If, on the other hand, the purge gas flow is interrupted, the valve is closed so that no pressure reduction can occur in the interior of the purge block.
  • the copper ball 17 is acted upon by a helical compression spring 18 . to that the ball 17 can be pressed specifically into its breech position.
  • the turns of the spring 18 extend close to the inner wall of the tube section 14 so that the spring 18 is guided through the tube.
  • This sink construction with compression spring is also suitable for inserting the sink in inclined or vertical vessel walls.
  • a sieve 19 is arranged in the pipe section 14, which is intended to prevent that disturbing particles get into the valve chamber, so that the valve seat always remains clean and thus ready for operation.
  • the sieve 19 is seated in a perforated cap 20 which is welded into the inner cross section of the tube section 14.
  • the perforated cap 20 also serves as an abutment for the compression spring 18 on the side facing away from the valve seat.
  • the gas purging plug 21 shown in FIG. 2 largely corresponds to the embodiment shown in FIG. 1, so that the same reference numerals have been used for the same parts.
  • the gas purging plug 21 consists of a frustoconical, gas-permeable molded block 2 with a sheet metal casing 3 which is welded together from a closely fitting sheet metal jacket 4 and a round sheet metal cover 6.
  • the provided in the sheet metal cover 6 central gas inlet opening 8 is formed by a round punch, the diameter of which is smaller than the inside diameter of the gas supply pipe 10.
  • the upper section 14 of the gas supply pipe 10 is welded directly to the underside of the sheet metal cover 6 via a weld seam 22, so that the edge of the metal cover 6 surrounding the gas inlet opening 8 projects into the cross section of the gas supply pipe 10.
  • a narrowed cross section 12 is provided in the interior of the gas supply pipe 10 at a distance from the gas inlet opening 8 of the sheet metal cover 6, which is formed by a perforated disk 13. This is welded between the two pipe sections 14 and 15, which form the gas supply pipe 10.
  • the closure body 24, which is arranged in the interior of the upper tube section 14, is designed as a solid, cylindrical part 25, the diameter of which is only slightly smaller than the inside diameter of the gas supply tube 10.
  • the cylindrical part 25 On its side facing the narrowed cross section 12 the cylindrical part 25 is provided with a frustoconical end piece 26 which engages in the perforated disc 13 and forms a tight seal when it lies on it.
  • This closure body 24, which mainly acts by its own weight, can only be used with gas purging stones 21 which are inserted into the bottom of a metallurgical vessel, the gas supply pipe 10 occupying a vertical position.
  • the closure body 24 In its upper end face 27, the closure body 24 is provided with a central recess 28 which is designed as a cylindrical depression.
  • the recess 28 has the task of enlarging the surface of the cylindrical part 25, which is preferably made of copper, so that the melt can solidify immediately in the event of a melt breakthrough.
  • a ring 29 made of refractory material is arranged around the gas supply pipe 10 as an additional breakdown protection.
  • the outer diameter of the ring 29 is larger than the largest diameter of the shaped block 2, so that the ring projects laterally beyond the shaped block.
  • the ring 29 is provided with an edge 30 which extends in the axial direction and which engages over the wider end of the shaped block 2 and lies against the underside of a perforated block 31.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (14)

1. Pierre de barbotage de gaz pour récipients métallurgiques, se compesant d'une brique moulée poreuse, perméable aux gaz, en matière réfractaire, d'un habillage partiel étanche aux gaz qui entoure cette brique et qui est formé par assemblage soudé d'une paroi latérale de tôle s'étendant autour de la surface périphérique latérale de la brique moulée et d'un couvercle de tôle recouvrant la surface frontale extérieure de la brique moulée, d'un tube d'arrivée de gaz qui est soudé au bord d'une ouverture d'entrée du gaz formée au centre du couvercle de tôle, ainsi que d'un dispositif de sécurité contre la rupture au niveau du tube d'arrivée de gaz, caractérisée en ce qu'il est prévu dans le tube d'arrivée de gaz (10), à un certaine distance de l'ouverture d'entrée du gaz (8) formée dans le couvercle de tôle (6), un resserrement de la section (12) et en ce qu'il est disposé, dans le segment de tube (14) entre le couvercle de tôle (6) et le resserrement de section (12), un corps obturateur (17; 24) qui est mobile au moins dans la direction axiale du tube d'arrivée de gaz (10) et dont la section transversale est plus petite que le diamètre intérieur du tube d'arrivée de gaz (10) et plus grande que le resserrement de section (12), le corps obturateur (17; 24) formant, avec le resserrement de section (12), un clapet antiretour.
2. Pierre de barbotage de gaz selon la revendication 1, caractérisée en ce que le corps obturateur (17; 24) est fait de cuivre.
3. Pierre de barbotage de gaz selon la revendication 1 ou 2, caractérisée en ce que le resserrement de section est formé par un disque percé (13) dont l'ouverture de passage centrale (12) constitue le siège de clapet.
4. Pierre de barbotage de gaz selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le segment de tube (14) entre le couvercle de tôle (6) et le disque percé (13), ainsi que le disque percé (13) sont en acier inoxydable.
5. Pierre de barbotage de gaz selon l'une quelconque des revendications 1 à 4, caractérisée en ce qu'il est prévu, entre le corps obturateur (17) et le couvercle de tôle (6), un ressort de pression (18) qui presse le corps obturateur (17) contre le siège de clapet (12).
6. Pierre de barbotage de gaz selon l'une quelconque des revendications 1 à 5, caractérisée en ce qu'un tamis (19) est disposé au niveau de l'ouverture d'entrée du gaz (8) formée dans le couvercle de tôle (6) ou un peu au-dessous de cette ouverture.
7. Pierre de barbotage de gaz selon la revendication 6, caractérisée en ce que le tamis (19) est fixé dans une coupelle perforée annulaire (20) soudée dans la section interne du tube d'arrivée de gaz (10).
8. Pierre de barbotage de gaz selon la revendication 7, caractérisée en ce que la coupelle perforée (20) est réalisée sous forme de contre-appui pour le ressort de pression (18).
9. Pierre de barbotage de gaz selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le corps obturateur (17) est une bille.
10. pierre de barbotage de gaz selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le corps obturateur (24) est une pièce cylindrique massive dont le diamètre n'est que légèrement plus petit que le diamètre intérieur du tube d'arrivée de gaz (10) et qui présente, du côté qui coopère avec le resserrement de section (12) du tube d'arrivée de gaz (10), une partie d'extrémité (26) effilée qui pénètre dans le resserrement de section (12).
11. Pierre de barbotage de gaz selon la revendication 10, caractérisée en ce que la partie d'extrémité (26) effilée est tronconique.
12. Pierre de barbotage de gaz selon la revendication 10 ou 11, caractérisée en ce qu'une cavité centrale (28) est prévue dans la surface frontale (27) de l'extrémité de la pièce cylindrique (25) située à l'opposé du resserrement de section (12).
13. Pierre de barbotage de gaz selon l'une quelconque des revendications 1 à 12, caractérisée en ce qu'une couronne (29) de matière réfractaire est disposée tout autour du tube d'arrivée de gaz (10).
14. Pierre de barbotage de gaz selon la revendication 13, caractérisée en ce que le diamètre extérieur de la couronne (29) est supérieur au plus grand diamètre de la brique moulée (2) et en ce que la couronne (29) peut être appliquée contre une brique perforée (31) ou contre la chemise du récipent, par un rebord (30) qui fait saillie en direction axiale et qui s'emboîte sur la plus large extrémité de la brique moulée (2).
EP84112404A 1983-11-17 1984-10-15 Brique pour lavage au gaz pour récipients métallurgiques Expired EP0148337B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84112404T ATE26859T1 (de) 1983-11-17 1984-10-15 Gasspuelstein fuer metallurgische gefaesse.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3341446 1983-11-17
DE3341446A DE3341446C1 (de) 1983-11-17 1983-11-17 Gasspuelstein fuer metallurgische Gefaesse

Publications (2)

Publication Number Publication Date
EP0148337A1 EP0148337A1 (fr) 1985-07-17
EP0148337B1 true EP0148337B1 (fr) 1987-04-29

Family

ID=6214467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112404A Expired EP0148337B1 (fr) 1983-11-17 1984-10-15 Brique pour lavage au gaz pour récipients métallurgiques

Country Status (6)

Country Link
US (1) US4616809A (fr)
EP (1) EP0148337B1 (fr)
JP (1) JPS60116711A (fr)
AT (1) ATE26859T1 (fr)
CA (1) CA1230480A (fr)
DE (2) DE3341446C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI558485B (zh) * 2012-08-27 2016-11-21 瑞法克托瑞智產股份有限公司 氣體沖灌元件及對應的氣體供應線

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3527793A1 (de) * 1985-08-02 1987-02-12 Esb Schweissbetrieb Burbach & Verfahren zur montage eines fuer metallurgische gefaesse vorgesehenen gasspuelsteins
DE3602264A1 (de) * 1986-01-25 1987-07-30 Burbach & Bender Ohg Gasspuelstein
DE3623609C1 (de) * 1986-07-12 1988-01-21 Didier Werke Ag Gasspueleinrichtung
DE3717840A1 (de) * 1987-05-27 1988-12-15 Radex Deutschland Ag Feuerfester keramischer formkoerper
DE3926786C2 (de) * 1989-04-14 1998-05-20 Mannesmann Ag Vorrichtung zum Einblasen von Gasen in Metallschmelzen
JPH04327361A (ja) * 1991-04-25 1992-11-16 Kurosaki Refract Co Ltd 溶融金属収納容器
DE19755199C1 (de) * 1997-12-12 1998-11-05 Didier Werke Ag Gasspüleinrichtung
DE19948848C1 (de) * 1999-10-08 2000-07-13 Dolomitwerke Gmbh Gasspülstein für metallurgische Gefäße
CN101368729B (zh) * 2004-01-30 2011-01-19 欧文工业用具公司 高效蒸发焰炬阀
JP2010189687A (ja) * 2009-02-17 2010-09-02 Tokyo Yogyo Co Ltd ガス吹き込みプラグ
DE202009005034U1 (de) 2009-04-06 2009-09-24 Calderys Deutschland Gmbh & Co. Ohg Hochtemperatur-Rückschlagventil für Gasspüler
US20160121391A1 (en) * 2013-06-07 2016-05-05 Vesuvius Crucible Company Lead retaining purge plug
ES2563192T3 (es) 2014-01-09 2016-03-11 Refractory Intellectual Property Gmbh & Co. Kg Elemento de limpieza con gas y elemento de conexión de gas correspondiente
ES2572686T3 (es) * 2014-05-05 2016-06-01 Refractory Intellectual Property Gmbh & Co. Kg Elemento cerámico refractario de barrido con gas
CN110891874B (zh) * 2017-04-27 2022-03-18 伊利诺斯工具制品有限公司 用于液体计量和分配的柔性球阀
CN111421130A (zh) * 2020-04-01 2020-07-17 东北大学 一种透气砖防渗漏装置及其防渗透方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1130736A (fr) * 1955-07-05 1957-02-11 Siderurgie Fse Inst Rech Procédé d'insufflation de gaz et de matières pulvérulentes dans les métaux fondus et dispositif pour le mettre en oeuvre
US3615086A (en) * 1969-06-20 1971-10-26 David A Jepson Apparatus for stirring molten metal
US3834685A (en) * 1973-09-24 1974-09-10 Allegheny Ludlum Ind Inc Apparatus for injecting fluids into molten metals
CA1030345A (fr) * 1975-04-21 1978-05-02 Toussaint Cote Etancheite au gaz et silencieux pour corps de tuyere
JPS5913495Y2 (ja) * 1977-08-02 1984-04-21 三洋電機株式会社 石油燃焼器の電池ケ−ス取付装置
SE426846B (sv) * 1981-06-04 1983-02-14 Stal Laval Apparat Ab Forma eller dysa for inblasning av gas- vetske-eller pulverformigt material i metalliska smeltor sasom stalsmeltor
DE8129091U1 (de) * 1981-10-05 1983-01-27 Sindelar, Günter, Dr.-Ing., 5102 Würselen "metallurgisches gefaess"
US4470582A (en) * 1982-02-15 1984-09-11 Zirconal Processes Limited Introduction of substances into molten metal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI558485B (zh) * 2012-08-27 2016-11-21 瑞法克托瑞智產股份有限公司 氣體沖灌元件及對應的氣體供應線

Also Published As

Publication number Publication date
ATE26859T1 (de) 1987-05-15
US4616809A (en) 1986-10-14
DE3341446C1 (de) 1985-07-11
DE3463397D1 (en) 1987-06-04
CA1230480A (fr) 1987-12-22
JPS60116711A (ja) 1985-06-24
EP0148337A1 (fr) 1985-07-17

Similar Documents

Publication Publication Date Title
EP0148337B1 (fr) Brique pour lavage au gaz pour récipients métallurgiques
DE3512907C2 (de) Ausgusshülse für einen Metalschmelze enthaltenden Behälter
DE3240097A1 (de) Metallurgisches gefaess
WO2006042597A1 (fr) Tube de percee destine a une cuve de fusion metallurgique
EP0181853B1 (fr) Brique pour lavage au gaz pour fours et récipients métallurgiques
DE6927561U (de) Behaelter mit schieberverschluss fuer fluessige schmelze.
DE3433123C2 (de) Blasstein für metallurgische Pfannen und Verfahren zu seinem Einfügen in die Zustellung
DE2453631A1 (de) Einrichtung zum stranggiessen
AT390083B (de) Verfahren zum ausruesten eines giessgefaesses fuer eine gasbehandlung einer metallschmelze, verfahren zum behandeln von metallschmelze in einem so ausgeruesteten gefaess sowie vorrichtung zum behandeln von metallschmelze in einem giessgefaess
EP0352353B1 (fr) Brique porte-busette d'une poche pour un obturateur d'une poche de coulée
DE3424255C2 (de) Angiessvorrichtung für Zwischenbehälter in Stranggiessanlagen
DE3000553A1 (de) Chemikalienbehaelter fuer atemgeraete
LU87458A1 (de) Spuelstein
CH665850A5 (de) Gasspuelstein fuer metallurgische gefaesse.
DE10115097A1 (de) Einrichtung zur Verhinderung eines Vortex-Effekts im Auslaufbereich eines metallurgischen Schmelzgefäßes
DE8129091U1 (de) "metallurgisches gefaess"
DE3901926C1 (en) Gas bubble device
DE3830871C1 (fr)
DE3341447C2 (fr)
DE3531533C2 (fr)
WO2004056505A1 (fr) Dispositif de passage de gaz pour creusets de fonderie metallurgiques
DE8805975U1 (de) Verschlußvorrichtung für das Abstichloch eines kippbaren Abstichkonverters
DE3520783C2 (fr)
AT405797B (de) Verfahren und vorrichtung zum entfernen von giessansätzen aus schattenrohren
DE4024698C2 (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19850919

17Q First examination report despatched

Effective date: 19860711

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 26859

Country of ref document: AT

Date of ref document: 19870515

Kind code of ref document: T

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19870430

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: RADEX DEUTSCHLAND AKTIENGESELLSCHAFT FUER FEUERFES

REF Corresponds to:

Ref document number: 3463397

Country of ref document: DE

Date of ref document: 19870604

ITF It: translation for a ep patent filed
ET Fr: translation filed
BECN Be: change of holder's name

Effective date: 19870429

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: DIDIER-WERKE AG

Effective date: 19880127

NLR1 Nl: opposition has been filed with the epo

Opponent name: DIDIER-WERKE AG

PLBN Opposition rejected

Free format text: ORIGINAL CODE: 0009273

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: OPPOSITION REJECTED

27O Opposition rejected

Effective date: 19890717

NLR2 Nl: decision of opposition
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19920924

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920929

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19921015

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19921028

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19921031

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19921103

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19921104

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19921118

Year of fee payment: 9

EPTA Lu: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19931015

Ref country code: GB

Effective date: 19931015

Ref country code: AT

Effective date: 19931015

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19931031

Ref country code: CH

Effective date: 19931031

Ref country code: BE

Effective date: 19931031

BERE Be: lapsed

Owner name: RADEX DEUTSCHLAND A.G. FUR FEUERFESTE ERZEUGNISSE

Effective date: 19931031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19940501

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19931015

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19940630

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940701

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST