DE3508526C1 - Process for cleaning and corrosion protection of utility water systems or heating plants - Google Patents
Process for cleaning and corrosion protection of utility water systems or heating plantsInfo
- Publication number
- DE3508526C1 DE3508526C1 DE19853508526 DE3508526A DE3508526C1 DE 3508526 C1 DE3508526 C1 DE 3508526C1 DE 19853508526 DE19853508526 DE 19853508526 DE 3508526 A DE3508526 A DE 3508526A DE 3508526 C1 DE3508526 C1 DE 3508526C1
- Authority
- DE
- Germany
- Prior art keywords
- corrosion
- water
- domestic water
- cleaning
- pressure
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
- C23G1/26—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions using inhibitors
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
- C23F11/187—Mixtures of inorganic inhibitors
- C23F11/188—Mixtures of inorganic inhibitors containing phosphates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
In F i g. 3 steht das Verteilerrohr 14 über ein weiteres Ventil 24 und eine Kupplung 25, ferner über einen Dreiwegehahn 26 mit einer Pumpe 27 in Verbindung, auf deren Saugseite das Saugrohr 28 in den Tank 29 eintaucht In diesen taucht ferner das Rückflußrohr 30 ein, das mit dem Dreiwegehahn 26 in Verbindung steht. In Fig. 3, the distributor pipe 14 is above a further valve 24 and a coupling 25, furthermore in connection with a pump 27 via a three-way valve 26, on the suction side of which the suction pipe 28 dips into the tank 29 the reflux tube 30, that with the three-way valve 26 in connection stands.
Der Tank 29 ist mit einer Flüssigkeit gefüllt, die durch Mischung von einer Phosphat/Silikat-Lösung im Verhältnis von 3 1 bis 7 : vorzugsweise 5 :1(5 Teile Wasser, 1 Teil Phosphat/Silikat-Lösung) gebildet ist. The tank 29 is filled with a liquid, which by mixing of a phosphate / silicate solution in a ratio of 3 1 to 7: preferably 5: 1 (5th Parts water, 1 part phosphate / silicate solution) is formed.
Die Phosphat/Silikat-Lösung, die bei dieser Mischung verwendet wird, wird folgendermaßen hergestellt: 5 - 10%, vorzugsweise 7,5% Monophosphate, 1020%, vorzugsweise 18% Polyphosphate, 20-30%, vorzugsweise 25% Silikate, Rest (6540%) Wasser. The phosphate / silicate solution used in this mixture is produced as follows: 5 - 10%, preferably 7.5% monophosphates, 1020%, preferably 18% polyphosphates, 20-30%, preferably 25% silicates, remainder (6540%) Water.
Zunächst wird die Verbindung des Brauchwassersystems 23 über den Dreiwegehahn 26 mit dem Tank 29 bzw. der Pumpe 27 hergestellt. Es ist natürlich auch möglich, einen Kupplungs-Anschlußteil etwa in das Ventil 23 einzuschrauben und dort die Verbindung herzustellen. First, the connection of the domestic water system 23 via the Three-way valve 26 with the tank 29 or the pump 27 is produced. It is natural also possible to screw a coupling connector into valve 23, for example and establish the connection there.
Zunächst wird das Brauchwassersystem geleert, d. h. First, the domestic water system is emptied, i. H.
das Ablaufventil 31 geöffnet. Das Hauptventil 11 ist dabei geschlossen. Das Brauchwassersystem 23 wird also geleert.the drain valve 31 is open. The main valve 11 is closed. The domestic water system 23 is thus emptied.
Als nächstes schließt man das Ablaufventil 31 öffnet das Ventil 24. Zunächst ist die Druckseite 27D der Pumpe 27 abgeschlossen. Es besteht also keine Verbindung zu Ventil 24 über Leitung 34 oder zum Rückflußrohr 30. Next, the drain valve 31 is closed, the valve 24 opens. First, the pressure side 27D of the pump 27 is closed. So there is none Connection to valve 24 via line 34 or to reflux pipe 30.
Dann wird die Pumpe 27 auf der Druckseite auf den gewünschten Überdruck gebracht, bspw. auf 4 bar. Jetzt wird der Dreiwegehahn 26 so gedreht, daß die Druckseite der Pumpe 27 mit der zum Brauchwassersystem 23 führenden Leitung 34 verbunden ist. Dabei ist das Rückflußrohr 30 von den anderen Anschlüssen des Dreiwegehahns 26 getrennt. Dabei wird das Ventil 24 geöffnet, so daß der volle Druck der Pumpe 27 auf das Brauchwassersystem 23 einwirkt und dabei dieses mit der beschriebenen Mischung im Tank 29 füllt. Dieser Vorgang ist dann beendet, wenn sich aus der Arbeitsweise der Pumpe ergibt, daß überall in dem gesamten Brauchwassersystem 23 der gewünschte voreingestellte Druck (z. B. 4 bar) herrscht. Dabei ist die Luft, die sich vorher - in Folge der Leerung - in dem Brauchwassersystem 23 befindet, entsprechend mit komprimiert worden. The pump 27 is then set to the desired overpressure on the pressure side brought, for example to 4 bar. Now the three-way valve 26 is turned so that the pressure side the pump 27 is connected to the line 34 leading to the domestic water system 23. The return pipe 30 is separated from the other connections of the three-way valve 26. The valve 24 is opened, so that the full pressure of the pump 27 on the domestic water system 23 acts and fills this with the described mixture in the tank 29. This The process is ended when the operation of the pump shows that everywhere the desired preset pressure (e.g. 4 bar). The air that was previously - as a result of the emptying - in the hot water system 23 is located, has been compressed accordingly.
Ist der gewünschte Druck gleichmäßig im gesamten Brauchwassersystem 23 hergestellt, so läßt man ihn eine bestimmte Zeit lang bestehen. Unter Druck wirkt die Mischung dabei auf das korrodierte Leitungssystem ein, z. B. 10 Minuten. Danach erfolgt eine Umschaltung des Dreiwegehahns 26 derart, daß das Brauchwassersystem 23 sich über den Dreiwegehahn 26 und das Rückflußrohr 30 in den Tank 29 entleert, wobei die Druckseite 27D der Pumpe 27 von den anderen Anschlüssen des Dreiwegehahns 26 getrennt ist. Mit der Herstellung dieser Verbindung am Dreiwegehahn 26 entlädt sich nun das unter dem Überdruck von 4 bar stehende Brauchwassersystem 23 schlagartig. Es kommt damit in Folge des vorher aufgebauten Drucks zu einem sehr starken Rückfluß, der dadurch noch verstärkt wird, daß die vorher im Brauchwassersystem 23 enthaltene und komprimierte Luft wieder expandiert. Durch diesen schlagartigen Rückfluß werden lockere bzw. Iösbare Korrosionsmaterialien, Schmutzteile, etc. aus den Leitungen des Brauchwassersystems 23 entfernt. Nicht entfernbare korrodierte Teile werden unterspült Es erfolgt eine Reinigung der Leitung, und zwar mit einem gewissen Abtrag von in den Innenraum der Leitungen hineinragenden durch Korrosion aufgebauten mineralischen Rostpartikeln, wie etwa der Roststücke 6, 7, 8. Für diesen Vorgang ist der momentane Abbau des Druckes im Brauchwassersystem 23 und die dadurch hervorgerufene explosionsartige Strömung bei Druckentlastung sowie die vorherige Einwirkung der Silikatkomponenten der Lösung wichtig. Die Reinigungs- und Abtragswirkung wird durch die Strömungsrichtung begünstigt. Sie ist entgegengesetzt derjenigen, mit der das Wasser normalerweise durch die Leitung fließt Es erfolgt also bei Druckentlastung eine Gegenstrom-Spülung. Is the desired pressure uniform in the entire domestic water system 23 produced, it is allowed to exist for a certain period of time. Works under pressure the mixture on the corroded pipe system, z. B. 10 minutes. Thereafter the three-way valve 26 is switched over in such a way that the domestic water system 23 is emptied via the three-way valve 26 and the return pipe 30 into the tank 29, the pressure side 27D of the pump 27 from the other connections of the three-way valve 26 is separated. With the establishment of this connection on the three-way valve 26 discharges Now the hot water system 23, which is under the overpressure of 4 bar, suddenly changes. As a result of the pressure built up beforehand, there is a very strong reflux, which is reinforced by the fact that the previously contained in the domestic water system 23 and compressed air expands again. Through this sudden reflux loose or detachable corrosion materials, dirt, etc. from the lines of the domestic water system 23 removed. Corroded parts will not be removable underwashed The line is cleaned with a certain amount of abrasion of mineral build-up due to corrosion and protruding into the interior of the lines Rust particles, such as the pieces of rust 6, 7, 8. For this one The process is the current one Reduction of the pressure in the domestic water system 23 and the resulting explosion Flow with pressure relief as well as the previous action of the silicate components important to the solution. The cleaning and removal effect is determined by the direction of flow favored. It is opposite to that with which the water normally appears flows through the line. Countercurrent flushing takes place when the pressure is released.
Gleichzeitig mit der Reinigung der Leitungen durch Loslösung von Korrosionspartikeln, Schmutzpartikeln, etc. und der Unterspülung nicht ablösbarer korrodierter Stellen werden die korrodierten Stellen mit der Phosphat/Silikat-Wasser-Lösung überzogen. Es entsteht dabei ein nicht wasserlöslicher isolierender Überzug der durch Korrosion zerklüfteten Innenoberfläche, nachdem vorher durch den Spülvorgang eine Säuberung erfolgte. Dabei reagieren die Phosphate und bilden schützende Deckschichten. Das Silikat bildet einen schützenden quasi als Dichtung wirkenden Überzug. Diese Schutzschicht/Überzug-Struktur stellt eine elektrische Isolierung dar und unterbricht damit die geschilderten elektrochemischen Korrosionsprozesse. Es stellt außerdem einen Schutz gegen das Einwirken von Sauerstoff dar, der an solchen Stellen durch Kleinstverwirbelungen freigesetzt wird. Dadurch wird die Fortsetzung des Rostvorgangs und der Korrosion gestoppt. Simultaneously with the cleaning of the lines by detaching them Corrosion particles, dirt particles, etc. and the undermining cannot be removed Corroded areas are corroded with the phosphate / silicate-water solution overdrawn. The result is a water-insoluble insulating coating of the Inside surface fissured by corrosion, after previously through the rinsing process a purge took place. The phosphates react and form protective cover layers. The silicate forms a protective coating that acts as a seal. These Protective layer / coating structure represents and interrupts electrical insulation thus the described electrochemical corrosion processes. It also represents a protection against the action of oxygen, which penetrates in such places Smallest turbulence is released. This will allow the rusting process to continue and the corrosion stopped.
Der Vorgang Druckbeaufschlagung Druckentlastung unter Verwendung der Phosphat/Silikat-Mischung wird mehrfach wiederholt. Vorzugsweise wird er ca. 20 mal hintereinander wiederholt, wobei man zunächst in der Phase der Druckbeaufschlagung die Flüssigkeit ca. 5 bis 8 Minuten einwirken läßt und bei der Druckentlastung jeweils genug Zeit lassen muß, daß das Brauchwassersystem 23 wieder vollkommen entleert wird. The act of pressurization using pressure relief the phosphate / silicate mixture is repeated several times. Preferably it will be approx. Repeated 20 times in a row, initially in the pressurization phase the liquid is allowed to act for about 5 to 8 minutes and each time the pressure is relieved must allow enough time for the hot water system 23 to completely empty again will.
Bei der Entleerung des Brauchwassersystems 23 läuft die Flüssigkeit jeweils über das Rückflußrohr 30 wieder in denselben Tank 29, aus dem saugseitig die Pumpe 27 versorgt wird. Damit ist ein sparsamer Gebrauch der Phosphat/Silikat-Lösung gewährleistet. Die Partikel, die dabei aus dem Leitungssystem herausgespült werden, setzen sich am Boden des Tanks 29 ab. Um zu verhindern, daß sie bei der sich zyklisch anschließenden Druckbeaufschlagung des Brauchwassersystems 23 wieder in dieses eingeführt werden, ist das in den Tank 29 eintauchende Ende des Saugrohres 28 mit einem Filter 32 versehen. Die ausgetragenen mineralischen und sonstigen Materialien 33, die durch die Druckbeaufschlagung und Druckentlastung der Leitungen aus diesen herausgelöst und herausgespült werden, sammeln sich am Boden des Tanks 29 an. When the domestic water system 23 is emptied, the liquid runs in each case via the return pipe 30 back into the same tank 29, from the suction side the pump 27 is supplied. This means that the phosphate / silicate solution is used sparingly guaranteed. The particles that are flushed out of the pipe system settle at the bottom of the tank 29. To prevent them from becoming cyclical subsequent pressurization of the domestic water system 23 is reintroduced into this is the immersed in the tank 29 end of the suction pipe 28 with a filter 32 provided. The discharged mineral and other materials 33, which by the pressurization and pressure relief of the lines released from these and are flushed out, accumulate at the bottom of the tank 29.
Ist dieser Vorgang abgeschlossen schließt man das Ventil 24 und trennt Pumpe 27, Dreiwegehahn 26, usw. Once this process is complete, valve 24 is closed and disconnected Pump 27, three-way valve 26, etc.
von dem Brauchwassersystem 23. Nachdem das Hauptventil wieder geöffnet ist, kann man die Hähne an der Verbraucherseite des Brauchwassersystems 23 öffnen und es mit frischem Wasser nachspülen. Auch dabei werden noch erhebliche Mengen von Korrosionsmaterialien ausgespült.from the hot water system 23. After the main valve reopened the taps on the consumer side of the domestic water system 23 can be opened and rinse it with fresh water. Even with this, there are still considerable quantities flushed out of corrosion materials.
Auch bei Heizungsanlagen ist das beschriebene Verfahren einsetzbar. Der Druck beim Schritt der Druckbeaufschlagung beträgt dabei 2,5 bar. The method described can also be used in heating systems. The pressure in the pressurization step is 2.5 bar.
Insgesamt handelt es sich bei dem erfindungsgemäßen Verfahren um eine Kombination eines Reinigungs-und eines »Versiegelungs«-Systems, wobei die Versiegelung darin zu sehen ist, daß die korrodierten Teile bzw. Materialien, die in den Leitungen verbleiben, mit der Silikat/Phosphat-Schicht überzogen und dadurch dauerhaft galvanisch, chemisch und mechanisch isoliert werden, so daß sich der Korrosionsprozeß nicht fortsetzen kann. Overall, the method according to the invention is a combination of a cleaning and a "sealing" system, the sealing It can be seen that the corroded parts or materials in the pipes remain with the silicate / phosphate layer coated and thereby be permanently galvanically, chemically and mechanically isolated, so that the corrosion process can not continue.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19853508526 DE3508526C1 (en) | 1985-03-09 | 1985-03-09 | Process for cleaning and corrosion protection of utility water systems or heating plants |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19853508526 DE3508526C1 (en) | 1985-03-09 | 1985-03-09 | Process for cleaning and corrosion protection of utility water systems or heating plants |
Publications (1)
Publication Number | Publication Date |
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DE3508526C1 true DE3508526C1 (en) | 1986-06-19 |
Family
ID=6264775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE19853508526 Expired DE3508526C1 (en) | 1985-03-09 | 1985-03-09 | Process for cleaning and corrosion protection of utility water systems or heating plants |
Country Status (1)
Country | Link |
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DE (1) | DE3508526C1 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3713427C1 (en) * | 1987-04-22 | 1988-12-08 | Otto Kamp | Method for cleaning service water systems or heating installations and device for carrying out the method |
DE3731441A1 (en) * | 1987-08-13 | 1989-02-23 | Imhof Elisabeth | Process and device for cleaning, corrosion removal, descaling if appropriate, and sealing of building water installations |
DE4134966A1 (en) * | 1991-10-23 | 1993-04-29 | Otto Kamp | Cleaning out utility water and heating systems - by connecting accumulator to end of pipework and repeatedly pressurising and depressurising system with cleaning fluid |
EP0860517A1 (en) * | 1997-02-19 | 1998-08-26 | Metakorin Wasser-Chemie GmbH | Method and composition for corrosion inhibiting water carrying metal systems |
DE19755622A1 (en) * | 1997-12-13 | 1999-06-24 | Kodiak Wasser Technologie Gmbh | Stable liquid aqueous concentrate permissible for protecting drinking water pipes from corrosion |
DE4321883C2 (en) * | 1993-07-01 | 2003-05-15 | Henkel Kgaa | Aqueous silicate solutions with high orthophosphate contents and processes for the corrosion protection treatment of drinking water pipes |
DE10259103B3 (en) * | 2002-12-18 | 2004-08-05 | Otto Kamp Gmbh | Pipeline system cleaning method e.g. for cold and/or hot water supply system, using cleaning solution for removing pipeline deposits |
WO2006084454A1 (en) * | 2005-02-10 | 2006-08-17 | Fachhochschule Lübeck Körperschaft des öffentlichen Rechts | Method for removing scale from pipes |
DE102005050200A1 (en) * | 2005-10-18 | 2007-04-19 | Henkel Kgaa | Corrosion protection for metallic water supply systems, comprises dosing silicates and supplement materials into the water stream |
DE102006032048A1 (en) * | 2006-07-10 | 2008-01-17 | Girolami Gmbh | Drinking water system operating method, involves opening circulation loop for rinsing return line in position, and controlling three-way armature by controller, where armature has drive for operating armature |
DE102019126497A1 (en) * | 2019-10-01 | 2021-04-01 | Bwt Ag | Inhibitor solution for corrosion protection for water pipes and installation systems |
DE102019132318A1 (en) * | 2019-11-28 | 2021-06-02 | Bwt Ag | Method and device for corrosion protection |
DE102022108314A1 (en) | 2022-04-06 | 2023-10-12 | Ecoclean Gmbh | Method for passivating a surface of a workpiece and device for passivating workpieces |
-
1985
- 1985-03-09 DE DE19853508526 patent/DE3508526C1/en not_active Expired
Non-Patent Citations (1)
Title |
---|
NICHTS-ERMITTELT * |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3713427C1 (en) * | 1987-04-22 | 1988-12-08 | Otto Kamp | Method for cleaning service water systems or heating installations and device for carrying out the method |
DE3731441A1 (en) * | 1987-08-13 | 1989-02-23 | Imhof Elisabeth | Process and device for cleaning, corrosion removal, descaling if appropriate, and sealing of building water installations |
DE4134966A1 (en) * | 1991-10-23 | 1993-04-29 | Otto Kamp | Cleaning out utility water and heating systems - by connecting accumulator to end of pipework and repeatedly pressurising and depressurising system with cleaning fluid |
DE4321883C2 (en) * | 1993-07-01 | 2003-05-15 | Henkel Kgaa | Aqueous silicate solutions with high orthophosphate contents and processes for the corrosion protection treatment of drinking water pipes |
EP0860517A1 (en) * | 1997-02-19 | 1998-08-26 | Metakorin Wasser-Chemie GmbH | Method and composition for corrosion inhibiting water carrying metal systems |
DE19755622A1 (en) * | 1997-12-13 | 1999-06-24 | Kodiak Wasser Technologie Gmbh | Stable liquid aqueous concentrate permissible for protecting drinking water pipes from corrosion |
DE19755622C2 (en) * | 1997-12-13 | 2001-08-16 | Kodiak Wasser Technologie Gmbh | Liquid aqueous concentrates for corrosion protection |
DE10259103B3 (en) * | 2002-12-18 | 2004-08-05 | Otto Kamp Gmbh | Pipeline system cleaning method e.g. for cold and/or hot water supply system, using cleaning solution for removing pipeline deposits |
WO2006084454A1 (en) * | 2005-02-10 | 2006-08-17 | Fachhochschule Lübeck Körperschaft des öffentlichen Rechts | Method for removing scale from pipes |
DE102005050200A1 (en) * | 2005-10-18 | 2007-04-19 | Henkel Kgaa | Corrosion protection for metallic water supply systems, comprises dosing silicates and supplement materials into the water stream |
EP1780310A3 (en) * | 2005-10-18 | 2008-01-02 | Henkel Kommanditgesellschaft Auf Aktien | Method for corrosion protection of metallic water suppling lines by using corrosion inhibitors |
DE102006032048A1 (en) * | 2006-07-10 | 2008-01-17 | Girolami Gmbh | Drinking water system operating method, involves opening circulation loop for rinsing return line in position, and controlling three-way armature by controller, where armature has drive for operating armature |
DE102006032048B4 (en) * | 2006-07-10 | 2017-01-05 | Girolami Gmbh | Method for operating a drinking water system and drinking water system |
DE102019126497A1 (en) * | 2019-10-01 | 2021-04-01 | Bwt Ag | Inhibitor solution for corrosion protection for water pipes and installation systems |
DE102019132318A1 (en) * | 2019-11-28 | 2021-06-02 | Bwt Ag | Method and device for corrosion protection |
DE102022108314A1 (en) | 2022-04-06 | 2023-10-12 | Ecoclean Gmbh | Method for passivating a surface of a workpiece and device for passivating workpieces |
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Legal Events
Date | Code | Title | Description |
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8100 | Publication of the examined application without publication of unexamined application | ||
D1 | Grant (no unexamined application published) patent law 81 | ||
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: KAMP, OTTO, 73614 SCHORNDORF, DE |