EP0405194B1 - Process and apparatus for electrophoretic enamelling iron or steel articles - Google Patents
Process and apparatus for electrophoretic enamelling iron or steel articles Download PDFInfo
- Publication number
- EP0405194B1 EP0405194B1 EP19900110656 EP90110656A EP0405194B1 EP 0405194 B1 EP0405194 B1 EP 0405194B1 EP 19900110656 EP19900110656 EP 19900110656 EP 90110656 A EP90110656 A EP 90110656A EP 0405194 B1 EP0405194 B1 EP 0405194B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- procedure
- accordance
- counter electrode
- enamel
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 8
- 229910000831 Steel Inorganic materials 0.000 title claims description 4
- 229910052742 iron Inorganic materials 0.000 title claims description 4
- 239000010959 steel Substances 0.000 title claims description 4
- 230000008569 process Effects 0.000 title description 4
- 238000000576 coating method Methods 0.000 claims description 37
- 239000011248 coating agent Substances 0.000 claims description 34
- 210000003298 dental enamel Anatomy 0.000 claims description 24
- 230000008878 coupling Effects 0.000 claims description 23
- 238000010168 coupling process Methods 0.000 claims description 23
- 238000005859 coupling reaction Methods 0.000 claims description 23
- 238000010276 construction Methods 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims 1
- 238000010422 painting Methods 0.000 description 5
- 239000004922 lacquer Substances 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/02—Electrophoretic coating characterised by the process with inorganic material
Definitions
- the invention relates to a method and a device for the electrophoretic coating of preferably iron or steel parts with enamel.
- the electrophoretic coating with enamel has hitherto been carried out exclusively in systems which work with lifting rods or the like.
- Such a system is described in DE-A-3402151.
- a disadvantage of these known systems operating in a clocked process is that the investment costs are relatively high.
- Another disadvantage is that the workpieces have to be transferred to a chain conveyor system after coating with enamel so that they can then be transported through the dryer.
- electrophoretic enamelling differs fundamentally from electrophoretic painting.
- electrophoretic painting the electrical resistance of the deposited paint layer increases with the layer thickness. If, for example, the electrophoretically deposited lacquer layer is initially thicker in places where the current is favorable, the electrical resistance increases - corresponding to the thickness of the lacquer layer - and less lacquer is then deposited at these points. This results in self-limitation of the layer thickness during electrophoretic painting.
- electrophoretic enamelling the electrical resistance does not increase with increasing layer thickness.
- the electrophoretically deposited grows Enamel layer continues undiminished at current-favored areas of a workpiece, so that this results in extremely differently thick enamel layers.
- electrophoretic enamelling has only been carried out in systems that work with lifting rods in a cycle process.
- the object of the invention is to avoid these known disadvantages and to disclose a method and an apparatus for carrying out the method in which only an inexpensive chain conveyor system can be used and in which evenly thick enamel layers are achieved.
- the invention is characterized by the features mentioned in the main claim.
- Advantageous embodiments of the invention result from the features of the subclaims.
- the electrophoretic enamelling system (1) consists of the pretreatment baths (2), in which the usual pretreatment such as rinsing, degreasing, activation etc. is carried out and a coating container (3) for electrophoretic coating with enamel. This is followed by further rinsing baths (4), a dryer (5) and a baking oven (not shown). At least one counter electrode (7) is present in the coating container (3) filled with enamel slip, which is arranged in a fixed association with the workpiece (8) during the electrophoretic coating.
- the counter electrode (7) in the exemplary embodiment according to FIGS. 2 and 3 is moved during the coating parallel to the workpiece (8) through the coating container (3) filled with enamel slip. This movement is driven by the chain conveyor system (9), which also transports the workpieces (8) through the enamelling system (1).
- a particularly exact parallel guidance of the counter electrode (7) to the workpiece (8) is achieved if the coating container (3) is assigned a guide (10) on which the counter electrode (7) is guided.
- the guide (10) can e.g. consist of guide rods (11) and guide bushes (12).
- the counter electrode (7) is connected to the chain conveyor system (9) via a coupling (13).
- the clutch (13) consists of a clutch fork (14) open at the top and a clutch pin (15).
- the coupling fork (14) is fastened to the guide bush (12), with which the counter electrode (7) is also connected.
- the coupling pin (15) is preferably arranged horizontally and connected to the conveyor chain of the chain conveyor system (9). This connection is particularly simple in construction if the hanger (16) for receiving the workpieces (8) is also arranged on the horizontal coupling pin (15).
- the power supply to the workpieces (8) can also take place via the horizontally arranged coupling pin (15).
- the desired coating time can be achieved by regulating the transport speed of the chain conveyor system (9).
- the counter electrode (7) and the workpiece (8) can thus completely can be transported in parallel from the chain conveyor system (9) through the coating container (3) filled with enamel slip.
- the coupling pin (15) is lifted out of the upwardly open coupling fork (14) by the conveyor chain (17) and thereby disengaged.
- the weight (19) of the counterelectrode (7), the guide bushing (12) and the coupling fork (14) on the guide rods (11) can again be pulled in via a cable (20) pull the initial position (21) and the next coating process can begin as soon as the next coupling pin (15) engages in the coupling fork (14).
- the coating containers (3) can be filled with different enamels, so that e.g. a color change can be carried out quickly and without long changeover times.
- the rinsing baths (4) downstream of the coating containers (3) can also be arranged horizontally and transversely to the conveying direction of the chain conveyor system (9) on a guide (22).
Landscapes
- Chemical & Material Sciences (AREA)
- Coating Apparatus (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chain Conveyers (AREA)
- Spray Control Apparatus (AREA)
- Electrostatic Spraying Apparatus (AREA)
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum elektrophoretischen Beschichten von vorzugsweise Eisen- oder Stahlteilen mit Email. Bei diesen bekannten Emaillierverfahren wurde bisher die elektrophoretische Beschichtung mit Email ausschließlich in Anlagen, die mit Hubgestängen oder dergl. arbeiten, im Taktverfahren durchgeführt. Eine derartige Anlage ist in DE-A-3402151 beschrieben. Nachteilig bei diesen bekannten im Taktverfahren arbeitenden Anlagen ist, daß die Anlagekosten relativ hoch sind. Als weiterer Nachteil kommt hinzu, daß die Werkstücke nach dem Beschichten mit Email auf ein Kettenfördersystem umgehängt werden müssen, damit sie anschließend durch den Trockner transportiert werden können.The invention relates to a method and a device for the electrophoretic coating of preferably iron or steel parts with enamel. In the case of these known enamelling processes, the electrophoretic coating with enamel has hitherto been carried out exclusively in systems which work with lifting rods or the like. Such a system is described in DE-A-3402151. A disadvantage of these known systems operating in a clocked process is that the investment costs are relatively high. Another disadvantage is that the workpieces have to be transferred to a chain conveyor system after coating with enamel so that they can then be transported through the dryer.
Das vom elektrophoretischen Lackieren bekannte Durchlaufverfahren über ein Kettenfördersystem konnte bisher nicht eingesetzt werden, weil beim elektrophoretischen Emaillieren - im Gegensatz zum elektrophoretischen Lackieren - eine Selbstbegrenzung der Schichtdicke durch Erhöhung des elektrischen Widerstands in der elektrophoretisch abgeschiedenen Emailschicht nicht gegeben ist und dadurchextrem unterschiedlich dicke Email-Schichten erreicht werden.The continuous process known from electrophoretic painting via a chain conveyor system has so far not been able to be used because in electrophoretic enamelling - in contrast to electrophoretic painting - there is no self-limitation of the layer thickness by increasing the electrical resistance in the electrophoretically deposited enamel layer and thus extremely differently thick enamel layers can be achieved.
In diesem Punkt unterscheidet sich das elektrophoretische Emaillieren grundsätzlich vom elektrophoretischen Lackieren.
Beim elektrophoretischen Lackieren erhöht sich der elektrische Widerstand der abgeschiedenen Lackschicht mit der Schichtdicke. Wenn z.B. an strombegünstigten Stellen die elektrophoretisch abgeschiedene Lackschicht zunächst dicker ist, erhöht sich - der Dicke der Lackschicht entsprechend - der elektrische Widerstand und es wird an diesen Stellen anschließend weniger Lack abgeschieden. Dadurch erfolgt beim elektrophoretischen Lackieren eine Selbstbegrenzung der Lack-Schichtdicke. Im Gegensatz dazu erhöht sich beim elektrophoretischen Emaillieren der elektrische Widerstand mit wachsender Schichtdicke nicht. Als Folge davon wächst die elektrophoretisch abgeschiedene Emailschicht an strombegünstigten Stellen eines Werkstücks unvermindert weiter, so daß es dadurch zu extrem unterschiedlich dicken Email-Schichten kommt. Das elektrophoretische Emaillieren erfolgte bisher ausschließlich in Anlagen, die mit Hubgestängen im Taktverfahren arbeiten.In this point, electrophoretic enamelling differs fundamentally from electrophoretic painting.
With electrophoretic painting, the electrical resistance of the deposited paint layer increases with the layer thickness. If, for example, the electrophoretically deposited lacquer layer is initially thicker in places where the current is favorable, the electrical resistance increases - corresponding to the thickness of the lacquer layer - and less lacquer is then deposited at these points. This results in self-limitation of the layer thickness during electrophoretic painting. In contrast, with electrophoretic enamelling, the electrical resistance does not increase with increasing layer thickness. As a result, the electrophoretically deposited grows Enamel layer continues undiminished at current-favored areas of a workpiece, so that this results in extremely differently thick enamel layers. Up to now, electrophoretic enamelling has only been carried out in systems that work with lifting rods in a cycle process.
Nach dem elektrophoretischen Beschichten mit Email müssen die Gehänge mit den Werkstücken für den Transport durch den Trockner und den Einbrennofen dann von Hand auf ein Kettenfördersystem umgehängt werden (DE-A-3402151). Die Aufgabe der Erfindung ist, diese bekannten Nachteile zu vermeiden und ein Verfahren und eine Vorrichtung zur Durchführung des Verfahrens zu offenbaren, bei welchem ausschließlich ein preiswertes Kettenfördersystem eingesetzt werden kann und bei dem trotzdem gleichmäßig dicke Email-Schichten erreicht werden.After electrophoretic coating with enamel, the hangers with the workpieces for transport through the dryer and the stoving oven must then be transferred to a chain conveyor system by hand (DE-A-3402151). The object of the invention is to avoid these known disadvantages and to disclose a method and an apparatus for carrying out the method in which only an inexpensive chain conveyor system can be used and in which evenly thick enamel layers are achieved.
Zu diesem Zweck ist die Erfindung durch die im Hauptanspruch genannten Merkmale gekennzeichnet. Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Merkmalen der Unteransprüche.For this purpose, the invention is characterized by the features mentioned in the main claim. Advantageous embodiments of the invention result from the features of the subclaims.
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen schematisch dargestellt.An embodiment of the invention is shown schematically in the drawings.
Es zeigen:
- Fig. 1 eine elektrophoretische Emaillier-Anlage in Seitenansicht,
- Fig. 2 den Beschichtungsbehälter in Seitenansicht,
- Fig. 3 den Beschichtungsbehälter nach Fig. 2 in Draufsicht.
- 1 is an electrophoretic enamelling plant in side view,
- 2 the coating container in side view,
- Fig. 3 shows the coating container of FIG. 2 in plan view.
Die elektrophoretische Emaillier-Anlage (1) besteht aus den Vorbehandlungsbädern (2), in denen die übliche Vorbehandlung wie Spülen, Entfetten, Aktivieren u.s.w. durchgeführt wird und einem Beschichtungsbehälter (3) für die elektrophoretische Beschichtung mit Email. Daran schließen sich noch weitere Spülbäder (4), ein Trockner (5) und ein nicht gezeichneter Einbrenn-Ofen an. In dem mit Email-Schlicker gefüllten Beschichtungsbehälter (3) ist mindestens eine Gegenelektrode (7) vorhanden, die während der elektrophoretischen Beschichtung in fester Zuordnung zum Werkstück (8) angeordnet ist.The electrophoretic enamelling system (1) consists of the pretreatment baths (2), in which the usual pretreatment such as rinsing, degreasing, activation etc. is carried out and a coating container (3) for electrophoretic coating with enamel. This is followed by further rinsing baths (4), a dryer (5) and a baking oven (not shown). At least one counter electrode (7) is present in the coating container (3) filled with enamel slip, which is arranged in a fixed association with the workpiece (8) during the electrophoretic coating.
Die Gegenelektrode (7) wird bei dem Ausführungsbeispiel nach Fig. 2 und 3 während der Beschichtung parallel zu dem Werkstück (8) durch den mit Email-Schlicker gefüllten Beschichtungsbehälter (3) bewegt. Der Antrieb für diese Bewegung erfolgt durch das Kettenfördersystem (9), das auch die Werkstücke (8) durch die Emaillier-Anlage (1) transportiert.The counter electrode (7) in the exemplary embodiment according to FIGS. 2 and 3 is moved during the coating parallel to the workpiece (8) through the coating container (3) filled with enamel slip. This movement is driven by the chain conveyor system (9), which also transports the workpieces (8) through the enamelling system (1).
Eine besondere exakte Parallelführung der Gegenelektrode (7) zum Werkstück (8) wird erreicht, wenn dem Beschichtungsbehälter (3) eine Führung (10) zugeordnet ist, auf der die Gegenelektrode (7) geführt ist. Die Führung (10) kann z.B. aus Führungsstangen (11) und Führungsbuchsen (12) bestehen. Die Gegenelektrode (7) ist über eine Kupplung (13) mit dem Kettenfördersystem (9) verbunden. Die Kupplung (13) besteht aus einer nach oben offenen Kupplungsgabel (14) und einem Kupplungszapfen (15). Die Kupplungsgabel (14) ist an der Führungsbuchse (12) befestigt, mit der auch die Gegenelektrode (7) verbunden ist. Der Kupplungszapfen (15) ist vorzugsweise waagerecht angeordnet und mit der Förderkette des Kettenfördersystems (9) verbunden. Konstruktiv besonders einfach ist diese Verbindung, wenn an dem waagerechten Kupplungszapfen (15) gleichzeitig auch das Gehänge (16) für die Aufnahme der Werkstücke (8) angeordnet ist.A particularly exact parallel guidance of the counter electrode (7) to the workpiece (8) is achieved if the coating container (3) is assigned a guide (10) on which the counter electrode (7) is guided. The guide (10) can e.g. consist of guide rods (11) and guide bushes (12). The counter electrode (7) is connected to the chain conveyor system (9) via a coupling (13). The clutch (13) consists of a clutch fork (14) open at the top and a clutch pin (15). The coupling fork (14) is fastened to the guide bush (12), with which the counter electrode (7) is also connected. The coupling pin (15) is preferably arranged horizontally and connected to the conveyor chain of the chain conveyor system (9). This connection is particularly simple in construction if the hanger (16) for receiving the workpieces (8) is also arranged on the horizontal coupling pin (15).
Die Stromzuführung zu den Werkstücken (8) kann ebenfalls über den waagerecht angeordneten Kupplungszapfen (15) erfolgen. Die gewünschte Beschichtungszeit kann über eine Regelung der Transportgeschwindigkeit des Kettenfördersystems (9) erfolgen.The power supply to the workpieces (8) can also take place via the horizontally arranged coupling pin (15). The desired coating time can be achieved by regulating the transport speed of the chain conveyor system (9).
Der mit der Förderkette (17) des Kettenfördersystems (9) verbundene waagerecht angeordnete Kupplungszapfen (15) greift in die nach oben offene Kupplungsgabel (14) und stellt somit die feste Zuordnung der Gegenelektrode (7) zum Werkstück (8) her. Die Gegenelektrode (7) und das Werkstück (8) können somit völlig parallel von dem Kettenfördersystem (9) durch den mit Email-Schlicker gefüllten Beschichtungsbehälter (3) transportiert werden.
Wenn die Gegenelektrode (7) und das Werkstück (8) die Endstellung (18) erreicht haben, wird der Kupplungszapfen (15) von der Förderkette (17) wieder aus der nach oben offenen Kupplungsgabel (14) gehoben und dadurch ausgekuppelt. Da nun keine Verbindung mehr mit der Förderkette (17) besteht, kann das Gewicht (19) die Gegenelektrode (7), die Führungsbuchse (12) und die Kupplungsgabel (14) auf den Führungsstangen (11) wieder über einen Seilzug (20) in die Anfangsstellung (21) ziehen und der nächste Beschichtungsvorgang kann beginnen, sobald der nächste Kupplungszapfen (15) in die Kupplungsgabel (14) eingreift.The horizontally arranged coupling pin (15) connected to the conveyor chain (17) of the chain conveyor system (9) engages in the coupling fork (14) which is open at the top and thus establishes the fixed assignment of the counterelectrode (7) to the workpiece (8). The counter electrode (7) and the workpiece (8) can thus completely can be transported in parallel from the chain conveyor system (9) through the coating container (3) filled with enamel slip.
When the counter electrode (7) and the workpiece (8) have reached the end position (18), the coupling pin (15) is lifted out of the upwardly open coupling fork (14) by the conveyor chain (17) and thereby disengaged. Since there is no longer a connection with the conveyor chain (17), the weight (19) of the counterelectrode (7), the guide bushing (12) and the coupling fork (14) on the guide rods (11) can again be pulled in via a cable (20) pull the initial position (21) and the next coating process can begin as soon as the next coupling pin (15) engages in the coupling fork (14).
Wenn zwei oder mehr nebeneinander stehende Beschichtungsbehälter (3) horizontal und quer zur Förderrichtung des Kettenfördersystems (9) verschiebbar auf einer Führung (22) angeordnet sind, können die Beschichtungsbehälter (3) mit unterschiedlichen Emails gefüllt werden, so daß z.B. ein Farbwechsel kurzfristig und ohne lange Umrüstzeiten durchgeführt werden kann. Die den Beschichtungsbehältern (3) nachgeschalteten Spülbäder (4) können ebenfalls horizontal und quer zur Förderrichtung des Kettenfördersystems (9) verschiebbar auf einer Führung (22) angeordnet sein.If two or more coating containers (3) standing side by side are arranged horizontally and transversely to the conveying direction of the chain conveyor system (9) on a guide (22), the coating containers (3) can be filled with different enamels, so that e.g. a color change can be carried out quickly and without long changeover times. The rinsing baths (4) downstream of the coating containers (3) can also be arranged horizontally and transversely to the conveying direction of the chain conveyor system (9) on a guide (22).
Claims (12)
- Procedure for electrophoretic coating of iron or steel parts with enamel, in which a coating container holding enamel frit in suspension is fitted with at least one counter electrode,
whereby
the transport of parts (8) through the coating container (3) is via a chain conveyor system (9) and that during coating of a part (8) the counter electrode (7) is moved during the coating process parallel to the part (8) while the part passes through the enamel frit coating container (3), so that during the coating of a part (8) with enamel the counter electrode (7) remains fixed in position in relation to the part (8). - Procedure in accordance with Claim 1,
whereby
the counter electrode (7) is transported by the chain conveyor system (9) during the coating of a part (8) with enamel from a start position (21) to an end position (18) through the enamel frit coating container (3). - Procedure in accordance with Claim 2,
whereby
the counter electrode (7) is pulled back to the start position (21) by a weight (19) as soon as a coupling (13), consisting of a coupling shaft (15) and a coupling fork which is open at the top (14) has been released at the end position. - Procedure for electrophoretic coating of iron or steel parts in accordance with Claims 1, 2 or 3 using an enamel frit coating container in which at least one counter electrode is fitted,
whereby
a chain conveyor system (9) is planned to transport the parts (8) through the coating container (3) and the coating container (3) is fitted with a guide rail (10) along which the counter electrode (7) is moved through the enamel frit coating container (3) parallel to the part (8) during the coating process, so that during the coating of the part (8) with enamel the counter electrode (7) remains fixed in position in relation to the part (8). - Procedure in accordance with Claim 4,
whereby
the counter electrode (7) is linked with the chain conveyor system (9) via a coupling (13). - Procedure in accordance with Claim 5,
whereby
the coupling (13) consists of a coupling fork (14) and a coupling shaft (15). - Procedure in accordance with Claim 6,
whereby
the coupling fork (14) is attached to the guide rail (10) for the counter electrode (7) and is open at the top. - Procedure in accordance with Claim 7,
whereby
the coupling shaft (15) is of cylindrical construction and horizontally mounted and is attached to the drive chain (17) of the chain conveyor system (9). - Procedure in accordance with Claim 8,
whereby
the horizontal coupling shaft (15) has carrier hangars (16) to hold the parts (8) to be enamel coated. - Procedure in accordance with Claim 9,
whereby
the electrical supply to the parts (8) is via the horizontal coupling shaft (15). - Procedure in accordance with Claim 10,
whereby
two or more coating containers (3) next to each other can be moved horizontally and orthogonally to the chain conveyor system (9) on a guide rail (22). - Procedure in accordance with Claim 11,
whereby
rinsing containers (4) are located after the coating containers (3) and similarly have two or more compartments and can also be moved horizontally and orthogonally to the chain conveyor system (9) on a guide rail (22).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3920841 | 1989-06-24 | ||
| DE19893920841 DE3920841C2 (en) | 1989-06-24 | 1989-06-24 | Method and device for the electrophoretic coating of iron or steel parts with enamel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0405194A1 EP0405194A1 (en) | 1991-01-02 |
| EP0405194B1 true EP0405194B1 (en) | 1993-09-01 |
Family
ID=6383571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19900110656 Expired - Lifetime EP0405194B1 (en) | 1989-06-24 | 1990-06-06 | Process and apparatus for electrophoretic enamelling iron or steel articles |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0405194B1 (en) |
| DE (1) | DE3920841C2 (en) |
| ES (1) | ES2044318T3 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2421224A1 (en) * | 1978-03-31 | 1979-10-26 | Cepem | PART POWERING DEVICE |
| US4376031A (en) * | 1982-03-31 | 1983-03-08 | Rca Corporation | Apparatus for electrophoretic deposition |
| DE3402151A1 (en) * | 1984-01-23 | 1985-07-25 | Miele & Cie GmbH & Co, 4830 Gütersloh | Process and apparatus for coating workpieces with enamel |
| DE3405767C2 (en) * | 1984-02-17 | 1986-07-24 | Asta Ullrich GmbH Annweiler am Trifels, 6747 Annweiler | Method and device for the production of enamelled cookware |
-
1989
- 1989-06-24 DE DE19893920841 patent/DE3920841C2/en not_active Expired - Fee Related
-
1990
- 1990-06-06 EP EP19900110656 patent/EP0405194B1/en not_active Expired - Lifetime
- 1990-06-06 ES ES90110656T patent/ES2044318T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ES2044318T3 (en) | 1994-01-01 |
| DE3920841A1 (en) | 1991-01-03 |
| DE3920841C2 (en) | 1998-04-02 |
| EP0405194A1 (en) | 1991-01-02 |
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Legal Events
| Date | Code | Title | Description |
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