EP0115812A2 - Current conducting electrode for metallurgical furnaces - Google Patents
Current conducting electrode for metallurgical furnaces Download PDFInfo
- Publication number
- EP0115812A2 EP0115812A2 EP84100701A EP84100701A EP0115812A2 EP 0115812 A2 EP0115812 A2 EP 0115812A2 EP 84100701 A EP84100701 A EP 84100701A EP 84100701 A EP84100701 A EP 84100701A EP 0115812 A2 EP0115812 A2 EP 0115812A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- graphite
- stones
- electrode according
- shaped
- 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.)
- Withdrawn
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 20
- 239000010439 graphite Substances 0.000 claims abstract description 20
- 239000000919 ceramic Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 239000004575 stone Substances 0.000 claims description 12
- 230000003628 erosive effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 210000002268 wool Anatomy 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052802 copper Inorganic materials 0.000 abstract description 13
- 239000010949 copper Substances 0.000 abstract description 13
- 210000002445 nipple Anatomy 0.000 abstract description 5
- 239000002893 slag Substances 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
- H05B7/101—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc
Definitions
- the invention relates to a current-conducting electrode for metallurgical furnaces with an edible electrode tip and a liquid-carrying cooling system, and to a method for coating the electrode.
- EP patent application No. 82109375.4 describes a graphite or carbon electrode for metallurgical furnaces, which is cooled below the burn-off temperature of the graphite by an internal cooling system.
- this electrode it has been shown, depending on the cooling system, especially if it consists of longitudinal copper tubes, that part or all of the electrical current can be conducted via the copper tubes. The current then flows from the electrode contact jaws via the graphite to the cooling system made of copper pipes.
- the current flow in the graphite is positively influenced by the fact that the electrical resistance reaches a minimum at the operating temperature of the electrode of around 600 ° C.
- the water-conducting cooling system of the electrode also serves as a clamping system in connection with the end flanges, so that the graphite body can also be assembled from several pieces.
- the object of the present invention is to design an electrode of the type described in the introduction in such a way that this erosion can be avoided by simple means and the durability of the electrode can thereby be improved.
- This object is achieved according to the invention in that, in order to avoid chemical erosion in its lower region, the graphite is replaced by at least one ceramic molded stone.
- the graphite in the lower part of the cooled electrode can advantageously be replaced by a ceramic molded block which has good thermal conductivity and is resistant to aggressive slags.
- a ceramic molded block which has good thermal conductivity and is resistant to aggressive slags.
- carbon-containing A1 2 0 3 or Mg0 stones have proven successful.
- two or more shaped stones can be used.
- the shaped block and the shaped blocks can expediently be reinforced, for example steel wool can be used as the reinforcement.
- a water-cooled graphite electrode 1 with a ceramic lower part 2 is shown.
- the total length of the electrode is, for example, approximately 4000 mm with a diameter of 500 mm.
- the level of the ceramic Part is about 800 mm and dimensioned so that the contact jaws (not shown) of the electrode holder 3 are always in contact with graphite when repositioning.
- the copper pipes with cooling water inlet and outlet are designated 4.
- two graphite sections 5 are connected to a graphite nipple 6.
- the box 7 is preserved in the upper graphite weft, so that the entire graphite part 5 can still be nippled as a consumable tip on the water-cooled copper nipple 8 after removal from the electrode.
- the lower flange 9 is made of copper and is also cooled.
- the upper flange 10 is made of austenitic steel, for example. It protrudes slightly above the graphite 5 in order to prevent the electrode 1 from slipping through the holder 3 for safety reasons. For safety reasons, the length of the electrode is also such that if it slipped in the lowest position of the electrode holder 3, the water-cooled nipple 8 could not be immersed in the liquid bath.
- the flanges 9 and 10 serve in connection with the cooling tubes 4 and the nuts 11 as a clamping unit for the graphite pieces 5 and the ceramic part 2. This bracing would also be releasable differently than shown. It is also possible to insert an additional tension rod or tension tube 12 made of a material with a higher strength than copper into the system. If it is a tube, it can also be used to add gases or solids in the vicinity of the arc 13. In this case, the lower copper flange 9 with copper nipple 8 and the consumable graphite tip 14 must also be drilled through 15.
- the lower copper flange 9 is provided on the outside with a recess 16 which is filled with electrically insulating materials (in the example shown with an asbestos cord 17). This avoids arcing that could destroy the flange.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Discharge Heating (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
Eine solche Elektrode setzt sich aus Teilstücken (5) aus Graphit und einem keramischen Unterteil (2) zusammen, an den die verzehrbare Graphitspitze (14) anschliesst. Im Innern der Elektrode ist ein Kühlsystem aus Kupferrohren (4) angeordnet, das sich bis zu einem Kupfernippel (8) erstreckt, an der die verzehrbare Graphitspitze (14) befestigt ist. Der keramische Elektrodenteil (2) verhindert, dass die Elektrode durch hochspritzende Schlacken beschädigt wird, wodurch die Lebensdauer der Elektrode in einfacher Weise wesentlich erhöht werden kann.
Description
Die Erfindung betrifft eine stromleitende Elektrode für metallurgische Oefen mit einer verzehrbaren Elektrodenspitze und einem flüssigkeitsführenden Kühlsystem, sowie ein Verfahren zum Beschichten der Elektrode.The invention relates to a current-conducting electrode for metallurgical furnaces with an edible electrode tip and a liquid-carrying cooling system, and to a method for coating the electrode.
In der EP-Patentanmeldung Nr. 82109375.4 ist eine Graphit-oder Kohleelektrode für metallurgische Oefen beschrieben, die durch ein inneres Kühlsystem unter die Abbrandtemperatur des Graphits gekühlt wird. Beim Einsatz dieser Elektrode hat es sich in Abhängigkeit vom Kühlsystem gezeigt, insbesondere wenn es aus längslaufenden Kupferrohren besteht, dass ein Teil oder der gesamte elektrische Strom über die Kupferrohre geleitet werden kann. Der Strom fliesst dann von den Elektrodenkontaktbacken über den Graphit auf das Kühlsystem aus Kupferrohren. Der Stromfluss im Graphit wird dadurch positiv beeinflusst, dass bei der Einsatztemperatur der Elektrode von etwa 600°C der elektrische Widerstand ein Minimum erreicht.EP patent application No. 82109375.4 describes a graphite or carbon electrode for metallurgical furnaces, which is cooled below the burn-off temperature of the graphite by an internal cooling system. When using this electrode, it has been shown, depending on the cooling system, especially if it consists of longitudinal copper tubes, that part or all of the electrical current can be conducted via the copper tubes. The current then flows from the electrode contact jaws via the graphite to the cooling system made of copper pipes. The current flow in the graphite is positively influenced by the fact that the electrical resistance reaches a minimum at the operating temperature of the electrode of around 600 ° C.
Das wasserführende Kühlsystem der Elektrode dient zudem in Verbindung mit den Endflanschen als Spannsystem, so dass der Graphitkörper auch aus mehreren Stücken zusammengestellt werden kann.The water-conducting cooling system of the electrode also serves as a clamping system in connection with the end flanges, so that the graphite body can also be assembled from several pieces.
In Abhängigkeit von der Ofenfahrweise, beispielsweise wenn mit einer Schaumschlacke gearbeitet wird, kann es vorkommen, dass Spritzer der heissen aggresiven Schlacke auf den unteren Teil der gekühlten Graphitelektrode geschleudert werden, ähnlich dem Vorgang, der in Verbindung mit wassergekühlten Wänden "Selfcoating" genannt wird. Das kann am unteren Teil der Elektrode zu einer gewissen Erosion durch chemische Reaktionen führen.Depending on the way the furnace is operated, for example when working with a foam slag, it can happen that splashes of the hot aggressive slag are thrown onto the lower part of the cooled graphite electrode, similar to the process that is called "self-coating" in connection with water-cooled walls. This can lead to some erosion from chemical reactions on the lower part of the electrode.
Aufgabe der vorliegenden Erfindung ist, eine Elektrode der eingangs beschriebenen Art so auszugestalten, dass diese Erosion durch einfache Mittel vermieden und dadurch die Haltbarkeit der Elektrode verbessert werden kann. Diese Aufgabe wird gemäss der Erfindung dadurch gelöst, dass zur Vermeidung von chemischer Erosion in ihrem untern Bereich der Graphit durch mindestens einen keramischen Formstein ersetzt ist.The object of the present invention is to design an electrode of the type described in the introduction in such a way that this erosion can be avoided by simple means and the durability of the electrode can thereby be improved. This object is achieved according to the invention in that, in order to avoid chemical erosion in its lower region, the graphite is replaced by at least one ceramic molded stone.
Da es möglich ist, den Stromfluss über das Kühlsytem aus Kupfer zu leiten, kann in vorteilhafter Weise im unteren Teil der gekühlten Elektrode der Graphit durch einen keramischen Formstein ersetzt werden, der eine gute Wärmeleitfähigkeit hat und resistent gegen aggresive Schlacken ist. Hier haben sich beispielsweise kohlenstoffhaltige A1203- oder Mg0-Steine bewährt. Anstelle eines einzigen Formsteins können zwei oder mehr Formsteine eingesetzt werden. Zweckmässig können der Formstein und die Formsteine armiert sein, wobei als Armierung z.B. Stahlwolle verwendet werden kann.Since it is possible to conduct the current flow over the cooling system made of copper, the graphite in the lower part of the cooled electrode can advantageously be replaced by a ceramic molded block which has good thermal conductivity and is resistant to aggressive slags. Here, for example, carbon-containing A1 2 0 3 or Mg0 stones have proven successful. Instead of a single shaped stone, two or more shaped stones can be used. The shaped block and the shaped blocks can expediently be reinforced, for example steel wool can be used as the reinforcement.
In der Figur ist eine wassergekühlte Graphitelektrode 1 mit keramischem Unterteil 2 dargestellt. Die Gesamtlänge der Elektrode beträgt beispielsweise etwa 4000 mm bei einem Durchmesser von 500 mm. Die Höhe des keramischen Teils ist etwa 800 mm und so bemessen, dass beim Nachsetzen die Kontaktbacken (nicht dargestellt) der Elektrodenhalterung 3 immer mit Graphit in Verbindung stehen.In the figure, a water-cooled
Die Kupferrohre mit Kühlwasserzulauf und -ablauf sind mit 4 bezeichnet. In diesem Beispiel sind zwei Graphitschüsse 5 mit einem Graphitnippel 6 verbunden. Im oberen Graphitschuss ist die Schachtel 7 erhalten, so dass der gesamte Graphitteil 5 nach Ausbau aus der Elektrode noch als verzehrbare Spitze an den wassergekühlten Kupfernippel 8 angenippelt werden kann. Der untere Flansch 9 besteht aus Kupfer und ist ebenfalls gekühlt. Der obere Flansch 10 ist beispielsweise aus austenitischem Stahl. Er steht etwas über den Graphit 5 vor, um aus Sicherheitsgründen ein Durchrutschen der Elektrode 1 durch die Halterung 3 zu vermeiden. Die Länge der Elektrode ist ebenfalls aus Sicherheitsgründen so bemessen, dass, wenn sie in der untersten Position des Elektrodenhalters 3 durchrutschen würde, der wassergekühlte Nippel 8 nicht in das flüssige Bad eintauchen kann.The copper pipes with cooling water inlet and outlet are designated 4. In this example, two
Die Flanschen 9 und 10 dienen in Verbindung mit den Kühlrohren 4 und den Muttern 11 als Spanneinheit für die Graphitstücke 5 und den keramischen Teil 2, Diese Verspannung wäre auch anders lösbar als dargestellt. Ebenso ist es möglich, eine zusätzliche Spannstange oder Spannrohr 12 aus einem Material mit höherer Festigkeit als Kupfer in das System einzufügen. Wenn es ein Rohr ist, kann es zudem zur Zugabe von Gasen oder Feststoffen in der Nähe des Lichtbogens 13 benutzt werden. In diesem Fall sind auch der untere Kupferflansch 9 mit Kupfernippel 8 sowie die verzehrbare Graphitspitze 14 zu durchbohren 15.The
Der untere Kupferflansch 9 ist in dieser Darstellung aussen mit einer Aussparung 16 versehen, die mit elektrisch isolierenden Massen (im gezeigten Beispiel mit einer Asbestschnur 17) ausgefüllt ist. Dadurch wird die Bildung von Lichtbögen, die den Flansch zerstören könnten, vermieden.In this illustration, the
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH50783A CH655128A5 (en) | 1983-01-28 | 1983-01-28 | ELECTRODE FOR METALLURGICAL FURNACES. |
| CH507/83 | 1983-01-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0115812A2 true EP0115812A2 (en) | 1984-08-15 |
| EP0115812A3 EP0115812A3 (en) | 1984-11-07 |
Family
ID=4188587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84100701A Withdrawn EP0115812A3 (en) | 1983-01-28 | 1984-01-24 | Current conducting electrode for metallurgical furnaces |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0115812A3 (en) |
| CH (1) | CH655128A5 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0218141A1 (en) * | 1985-09-27 | 1987-04-15 | Great Lakes Carbon Corporation | Scalloped nipple for water-cooled electrodes |
| US4853942A (en) * | 1986-08-05 | 1989-08-01 | Hylsa, S.A. De C.V. | Graphite electrode with internal cooling for electric arc furnaces |
| RU2145469C1 (en) * | 1997-12-09 | 2000-02-10 | Бершицкий Игорь Михайлович | Arc-furnace electrode holder |
| WO2002062105A1 (en) * | 2001-02-01 | 2002-08-08 | Techcom Import-Export Gmbh | Method for cooling an electrode during an electric melting furnace operation and electrode |
| WO2003077782A1 (en) * | 2002-03-20 | 2003-09-25 | Fogazzi Di Venturelli Andrea & C. S.N.C. | Catheter for radio frequency induced hyperthermia treatment |
| US7449499B2 (en) | 2003-08-12 | 2008-11-11 | 3M Innovative Properties Company | Self-etching dental compositions and methods |
| US8404144B2 (en) | 2002-12-30 | 2013-03-26 | 3M Innovative Properties Company | Compositions including polymerizable bisphosphonic acids and methods |
| US8465284B2 (en) | 2004-07-08 | 2013-06-18 | 3M Innovative Properties Company | Dental methods, compositions, and kits including acid-sensitive dyes |
| US8722760B2 (en) | 2004-08-11 | 2014-05-13 | 3M Innovative Properties Company | Self-adhesive compositions including a plurality of acidic compounds |
| US9943465B2 (en) | 2006-12-13 | 2018-04-17 | 3M Innovative Properties Company | Methods of using a dental composition having an acidic component and a photobleachable dye |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE461094C (en) * | 1925-05-06 | 1928-06-13 | Siemens & Co Geb | Carbon electrode for electric ovens |
| FR1255349A (en) * | 1959-10-02 | 1961-03-10 | Process for the production of alloy steels and pure iron | |
| SE337435B (en) * | 1965-07-13 | 1971-08-09 | J Oestberg | |
| DE2725537A1 (en) * | 1977-06-06 | 1978-12-14 | Korf Stahl | ELECTRODE FOR ARC FURNACE |
| DE3116221A1 (en) * | 1981-04-23 | 1982-11-11 | C. Conradty Nürnberg GmbH & Co KG, 8505 Röthenbach | ELECTRODE FOR ARC FURNACES AND THEIR USE |
-
1983
- 1983-01-28 CH CH50783A patent/CH655128A5/en not_active IP Right Cessation
-
1984
- 1984-01-24 EP EP84100701A patent/EP0115812A3/en not_active Withdrawn
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0218141A1 (en) * | 1985-09-27 | 1987-04-15 | Great Lakes Carbon Corporation | Scalloped nipple for water-cooled electrodes |
| US4853942A (en) * | 1986-08-05 | 1989-08-01 | Hylsa, S.A. De C.V. | Graphite electrode with internal cooling for electric arc furnaces |
| RU2145469C1 (en) * | 1997-12-09 | 2000-02-10 | Бершицкий Игорь Михайлович | Arc-furnace electrode holder |
| WO2002062105A1 (en) * | 2001-02-01 | 2002-08-08 | Techcom Import-Export Gmbh | Method for cooling an electrode during an electric melting furnace operation and electrode |
| RU2230440C2 (en) * | 2001-02-01 | 2004-06-10 | Хлопонин Виктор Николаевич | Electrode and method for its cooling in the course of electric furnace ope ration |
| WO2003077782A1 (en) * | 2002-03-20 | 2003-09-25 | Fogazzi Di Venturelli Andrea & C. S.N.C. | Catheter for radio frequency induced hyperthermia treatment |
| US8404144B2 (en) | 2002-12-30 | 2013-03-26 | 3M Innovative Properties Company | Compositions including polymerizable bisphosphonic acids and methods |
| US7449499B2 (en) | 2003-08-12 | 2008-11-11 | 3M Innovative Properties Company | Self-etching dental compositions and methods |
| US7632098B2 (en) | 2003-08-12 | 2009-12-15 | 3M Innovative Properties Company | Self-adhesive dental compositions and methods |
| US7699605B2 (en) | 2003-08-12 | 2010-04-20 | 3M Espe Ag | Self-etching emulsion dental compositions and methods |
| US8029286B2 (en) | 2003-08-12 | 2011-10-04 | 3M Innovative Properties Company | Self-etching dental compositions and methods |
| US7452924B2 (en) | 2003-08-12 | 2008-11-18 | 3M Espe Ag | Self-etching emulsion dental compositions and methods |
| US8465284B2 (en) | 2004-07-08 | 2013-06-18 | 3M Innovative Properties Company | Dental methods, compositions, and kits including acid-sensitive dyes |
| US8722760B2 (en) | 2004-08-11 | 2014-05-13 | 3M Innovative Properties Company | Self-adhesive compositions including a plurality of acidic compounds |
| US9943465B2 (en) | 2006-12-13 | 2018-04-17 | 3M Innovative Properties Company | Methods of using a dental composition having an acidic component and a photobleachable dye |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0115812A3 (en) | 1984-11-07 |
| CH655128A5 (en) | 1986-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3106741C2 (en) | Contact electrode arrangement for arc or resistance melting furnace | |
| EP0115812A2 (en) | Current conducting electrode for metallurgical furnaces | |
| EP3175939B1 (en) | Sliding closure at the spout of a metallurgical vessel | |
| CH629056A5 (en) | ELECTRODE FOR ARC FURNACE. | |
| EP0589150B1 (en) | Bottom electrode for direct current arc furnaces | |
| EP0133925A1 (en) | Bottom electrode arrangement for a direct current arc furnace | |
| DE3110204A1 (en) | DEVICE FOR INTRODUCING GASES IN METALLURGICAL VESSELS | |
| EP0422406B1 (en) | Anode for direct current arc furnace | |
| DE29602191U1 (en) | Bottom electrode | |
| DE4042330A1 (en) | Glass melting furnace bottom electrode - forming part of tapping device to prevent tap-hole blockage | |
| DE1608082C3 (en) | Device for refining steel medium »slag in a continuous casting mold | |
| CA1141174A (en) | Homogenization of metal using gas | |
| DE10132575C1 (en) | Refractory outlet used in the wall of a metallurgical vessel for steel melts has electrodes made from metal having a high melting point and/or formed from one of its oxides | |
| DE2723568C3 (en) | Slag tapping | |
| DE10005821A1 (en) | Cooled noble metal electrode for setting a certain electrode surface | |
| CA1302081C (en) | Consumable lance | |
| AT406239B (en) | Water-cooled mould for continuous casting or electroslag remelting | |
| EP0530932B1 (en) | Metallurgical container for a DC arc installation | |
| CH653201A5 (en) | Hollow electrode for feeding arc furnaces | |
| DE3229367A1 (en) | CONTINUOUS HEATER FOR MELT-LIQUID METALS | |
| EP0077513A1 (en) | Method of preventing the consumption of a current-conducting electrode for metallurgical furnaces, and electrode | |
| DE1817124A1 (en) | Method and device for cooling metal melts formed by electroslag remelting, in particular steel melts | |
| DE69313971T2 (en) | Lance for introducing treatment agents into metal melts | |
| EP0956917B1 (en) | Metallurgical vessel | |
| EP0543475B1 (en) | Method and apparatus for renewing bottom electrodes in an arc furnace |
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 DE FR GB IT SE |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Designated state(s): AT BE DE FR GB IT SE |
|
| 17P | Request for examination filed |
Effective date: 19850401 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: C. CONRADTY NUERNBERG GMBH & CO. KG |
|
| 17Q | First examination report despatched |
Effective date: 19861020 |
|
| D17Q | First examination report despatched (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19880802 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ELSNER, EMIL, DR. Inventor name: REIBER, DIETFRIED Inventor name: MESSMER, JOSEF |