DE3028590A1 - Korrosionsschutz in kesselsystemen - Google Patents
Korrosionsschutz in kesselsystemenInfo
- Publication number
- DE3028590A1 DE3028590A1 DE19803028590 DE3028590A DE3028590A1 DE 3028590 A1 DE3028590 A1 DE 3028590A1 DE 19803028590 DE19803028590 DE 19803028590 DE 3028590 A DE3028590 A DE 3028590A DE 3028590 A1 DE3028590 A1 DE 3028590A1
- Authority
- DE
- Germany
- Prior art keywords
- oxygen
- water
- hydroquinone
- boiler
- feed water
- 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.)
- Granted
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
- 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
- C23F11/10—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 organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/141—Amines; Quaternary ammonium compounds
-
- 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
- C23F11/10—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 organic inhibitors
- C23F11/12—Oxygen-containing compounds
- C23F11/122—Alcohols; Aldehydes; Ketones
-
- 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
- C23F11/10—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 organic inhibitors
- C23F11/16—Sulfur-containing compounds
- C23F11/163—Sulfonic acids
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Description
Drücken im Bereich von 1 bis 71,3 kg/cm oder mehr eingesetzt werden. Diesen Bedingungen ausgesetzte Metalloberflächen bestehen im allgemeinen aus Eisen oder Stahl.
Rl
Zeit (Minu ten) |
Na2SO3 | 5 | ppm | Hydrochinon | 20 | ppm | N2 | H4 |
76 ppm | 8 | ,85 | 10 ppm | 8 | ,80 | 10 | ppm | |
0 | 8,75 | 4 | ,15 | 8,85 | 0 | ;20 | 8, | 40 |
1 | 6,40 | 3 | ,90 | 0,50 | 0 | ,02 | - | - |
2 | 4,70 | 3 | ,78 | 0,12 | 0 | ,00 | - | - |
3 | 3,50 | 3 | ,70 | 0,11 | 0 | ,00 | - | - |
4 | 2,60 | 3 | , 60 | 0,10 | 0 | ,00 | - | - |
5 | lr95 | 3 | ,15 | 0,10 | 0 | ,00 | - | - |
10 | 0#48 | 2 | ,82 | 0,05 | 0 | ,00 | - | - |
15 | 0,15 | 2 | ,20 | 0,00 | 0 | ,00 | - | - |
30 | 0,00 | 1 | ,00 | 0,00 | 0 | ,00 | 8, | 00 |
24 std. | 0, 00 | 0,00 | 3, | 05 | ||||
Claims (5)
- UEXXULL & £TOLBERf5PATENTANiWAlTEBESElERSTRASSE Λ D 2000 HAMBURG 52P.28&BQPROFESSIONAL REPRESENTATIVES BEFORE THE EUROPEAN PATENT OFFICEDR J D FRHR von UEXKULL DR ULRICH GRAF STOLBERG DIPL ING JÜRGEN SUCHANTKE DIPL ING ARNULF HUBER DR ALLARD von KAMEKE DR KARL HEINZ SCHULMEYERChemed CorporationDuBois Tower
Cincinnati, Ohio/V.St.A,(Prio: 12. Okt. 1979 und 26. Dez. 1979, US 84 520 und
US 107 486 - 16802)Juli 1980Korrosionsschutz in KesselsystemenPatentansprüche; 1. Verfahren zum Schutz von Metalloberflächen in Kesselsystemen gegen Korrosion, die durch im Wasser gelösten Sauerstoff bewirkt wird, dadurch gekennzeichnet, daß man dem System eine wirksame Menge von 0,1 bis 20 Gewichtsteilen je Gewichtsteil Sauerstoff im Wasser eines Sauerstoffängers aus der Gruppe bestehend aus0-4(R2)0-4130017/05U§028590^ (SO3M)0_2
Rloder ^XoXo)-(SO3M) 0_2zusetzt, wobei R und R unabhängig voneinander -OH oder -NH , R„ eine niedere Alkylgruppe mit 1 bis 8 Kohlenstoffatomen und M Wasserstoff, Natrium oder Kalium oder Kombinationen derselben bedeuten. - 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Sauerstoffanger, bezogen auf das Gewicht des Sauerstoffs im Wasser, in einer 1 bis etwa 5 mal so großen Menge verwendet wird.
- 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als Sauerstoffanger Hydrochinon verwendet wird.
- 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der pH-Wert größer als 8 ist.
- 5. Verfahren nach Anspruch 1, 2, 3 oder 4, dadurch gekennzeichnet, daß die Metalloberflächen Eisen- und/oder Stahloberflächen sind, der Sauerstoffanger130017/05U30285!Hydrochinon ist und dem Speisewasser des Kessels zugesetzt wird, das Speisewasser gelösten Sauerstoff enthält, die zugegebene Menge an Hydrochinon 1 bis 5 mal größer als das Gewicht des Sauerstoffs im Speisewasser ist, das Hydrochinon im Kesselwasser auf etwa 0,1 bis 1 ppm und der pH-Wert des Kesselspeisewassers im Bereich von 8 bis 11 gehalten werden.1 3001 7/05U
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US8452079A | 1979-10-12 | 1979-10-12 | |
US06/107,486 US4278635A (en) | 1979-10-12 | 1979-12-26 | Method for deoxygenation of water |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3028590A1 true DE3028590A1 (de) | 1981-04-23 |
DE3028590C2 DE3028590C2 (de) | 1990-08-09 |
Family
ID=26771081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19803028590 Granted DE3028590A1 (de) | 1979-10-12 | 1980-07-28 | Korrosionsschutz in kesselsystemen |
Country Status (9)
Country | Link |
---|---|
US (1) | US4278635A (de) |
CA (1) | CA1262305A (de) |
DE (1) | DE3028590A1 (de) |
ES (1) | ES495840A0 (de) |
FR (1) | FR2467246B1 (de) |
GB (1) | GB2060598B (de) |
IT (1) | IT1140997B (de) |
MY (1) | MY8500537A (de) |
SE (1) | SE8005448L (de) |
Families Citing this family (45)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5147604A (en) * | 1980-04-28 | 1992-09-15 | Betz Laboratories, Inc. | Dioxo-aromatic compounds as oxygen scavengers |
US4728497A (en) * | 1980-12-15 | 1988-03-01 | Betz Laboratories, Inc. | Use of aminophenol compounds as oxygen scavengers in an aqueous medium |
US4363734A (en) * | 1981-02-05 | 1982-12-14 | Nalco Chemical Company | 1,3-Dihydroxy acetone as an oxygen scavenger for water |
FR2522522A1 (fr) * | 1982-01-27 | 1983-09-09 | Leuna Werke Veb | Procede pour ameliorer l'activite initiale de l'hydrazine activee |
US4389327A (en) * | 1982-06-14 | 1983-06-21 | Olin Corporation | Use of selected 1,2-dihydro-1,2,4,5-tetrazines as oxygen-scavenging agents |
US4512909A (en) * | 1982-06-30 | 1985-04-23 | Olin Corporation | Use of a hydroquinone compound with hydrazine (1:1 molar ratio) as an oxygen-scavenging and a corrosion-inhibiting agent |
DE3316265A1 (de) * | 1982-07-31 | 1984-02-02 | Bayer Ag, 5090 Leverkusen | Verfahren zur reinigung von abwaessern |
US4789488A (en) * | 1983-11-10 | 1988-12-06 | Westinghouse Electric Corp. | Catalyzed oxygen removal with hydrogen for steam generator systems |
CA1210930A (en) * | 1984-04-18 | 1986-09-09 | Harvey W. Thompson | Composition and method for deoxygenation |
US4549968A (en) * | 1984-05-18 | 1985-10-29 | Betz Laboratories, Inc. | Method of utilizing improved stability oxygen scavenger compositions |
US4569783A (en) * | 1984-11-01 | 1986-02-11 | Betz Laboratories, Inc. | Hydroquinone catalyzed oxygen scavenger and methods of use thereof |
US4541932A (en) * | 1984-11-09 | 1985-09-17 | Betz Laboratories, Inc. | Hydroquinone catalyzed oxygen scavenger and methods of use thereof |
DK8600502A (de) * | 1985-02-05 | 1986-08-06 | ||
US4895703A (en) * | 1985-09-17 | 1990-01-23 | Calgon Corporation | Trihydroxybenzene boiler corrosion inhibitor compositions and method |
US4980128A (en) * | 1987-03-16 | 1990-12-25 | W. R. Grace & Co.-Conn. | Control of corrosion in aqueous systems |
US4929364A (en) * | 1987-06-19 | 1990-05-29 | Nalco Chemical Company | Amine/gallic acid blends as oxygen scavengers |
US4847001A (en) * | 1987-07-01 | 1989-07-11 | W. R. Grace & Co.-Conn. | Control of corrosion in aqueous systems |
US4734258A (en) * | 1987-08-07 | 1988-03-29 | Nalco Chemical Company | Morpholinohexose reductone as an oxygen scavenger |
US4968438A (en) * | 1987-09-18 | 1990-11-06 | Nalco Chemical Company | Gallic acid as an oxygen scavenger |
US4810405A (en) * | 1987-10-21 | 1989-03-07 | Dearborn Chemical Company, Limited | Rust removal and composition thereof |
US4935205A (en) * | 1988-06-10 | 1990-06-19 | W. R. Grace & Co.-Conn. | Corrosion inhibition |
US5094814A (en) * | 1990-06-15 | 1992-03-10 | Nalco Chemical Company | All-volatile multi-functional oxygen and carbon dioxide corrosion control treatment for steam systems |
US5114618A (en) * | 1990-10-11 | 1992-05-19 | Pfizer Inc. | Oxygen removal with keto-gluconates |
US5178796A (en) * | 1990-10-11 | 1993-01-12 | Pfizer Inc. | Method for oxygen removal with keto-gluconates |
US6121217A (en) | 1990-11-05 | 2000-09-19 | Ekc Technology, Inc. | Alkanolamine semiconductor process residue removal composition and process |
US6242400B1 (en) | 1990-11-05 | 2001-06-05 | Ekc Technology, Inc. | Method of stripping resists from substrates using hydroxylamine and alkanolamine |
US5279771A (en) | 1990-11-05 | 1994-01-18 | Ekc Technology, Inc. | Stripping compositions comprising hydroxylamine and alkanolamine |
US7205265B2 (en) | 1990-11-05 | 2007-04-17 | Ekc Technology, Inc. | Cleaning compositions and methods of use thereof |
US6110881A (en) * | 1990-11-05 | 2000-08-29 | Ekc Technology, Inc. | Cleaning solutions including nucleophilic amine compound having reduction and oxidation potentials |
US6000411A (en) * | 1990-11-05 | 1999-12-14 | Ekc Technology, Inc. | Cleaning compositions for removing etching residue and method of using |
US20040018949A1 (en) * | 1990-11-05 | 2004-01-29 | Wai Mun Lee | Semiconductor process residue removal composition and process |
US5091108A (en) * | 1991-02-21 | 1992-02-25 | Nalco Chemical Company | Method of retarding corrosion of metal surfaces in contact with boiler water systems which corrosion is caused by dissolved oxygen |
US5164110A (en) * | 1991-02-21 | 1992-11-17 | Nalco Chemical Company | Method of retarding corrosion of metal surfaces in contact with boiler water systems which corrosion is caused by dissolved oxygen |
US5223146A (en) * | 1991-10-09 | 1993-06-29 | W. R. Grace & Co.-Conn. | Dispersion of iron (III) oxides using certain dihydroxaromatic compounds |
US5139702A (en) * | 1991-10-24 | 1992-08-18 | W. R. Grace & Co.-Conn. | Naphthylamine polycarboxylic acids |
US5167835A (en) * | 1991-11-06 | 1992-12-01 | Nalco Chemical Company | Method of scavenging oxygen from boiler waters with substituted quinolines |
US5362408A (en) * | 1992-07-14 | 1994-11-08 | The Western Company Of North America | High temperature gel stabilizer for fracturing fluids |
US7144849B2 (en) * | 1993-06-21 | 2006-12-05 | Ekc Technology, Inc. | Cleaning solutions including nucleophilic amine compound having reduction and oxidation potentials |
US5565416A (en) * | 1994-01-10 | 1996-10-15 | Phillips Petroleum Company | Corrosion inhibitor for wellbore applications |
EP0787225B1 (de) * | 1994-10-13 | 2000-02-09 | Catachem, Inc. | Verfahren zum minimieren des lösungsmittelabbaus und korrosion in aminlösungsmittelbehandlungssystemen |
US5512243A (en) * | 1995-04-11 | 1996-04-30 | Betz Laboratories, Inc. | Cyclohexanedione oxygen scavengers |
JP3656384B2 (ja) * | 1997-03-28 | 2005-06-08 | 三浦工業株式会社 | ボイラの運転方法 |
US20060042663A1 (en) * | 2004-08-25 | 2006-03-02 | Baker Hughes Incorporated | Method for removing iron deposits from within closed loop systems |
US20080108522A1 (en) * | 2006-11-07 | 2008-05-08 | Bj Services Company | Use of anionic surfactants as hydration aid for fracturing fluids |
CN106966478A (zh) * | 2017-04-07 | 2017-07-21 | 苏州安利化工有限公司 | 锅炉水预除氧方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH488030A (de) * | 1966-12-14 | 1970-03-31 | Bayer Ag | Verfahren zum Korrosionsschutz von Metall |
US3983048A (en) * | 1972-12-26 | 1976-09-28 | Olin Corporation | Composition for accelerating oxygen removal comprised of a mixture of aqueous hydrazine and an aryl amine compound |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1754457A (en) * | 1928-09-20 | 1930-04-15 | Du Pont | Noncorrosive alcoholic solution |
US1988823A (en) * | 1932-01-26 | 1935-01-22 | Stanco Inc | Rust remover |
US2339091A (en) * | 1940-11-14 | 1944-01-11 | Bell Telephone Labor Inc | Stabilized halogenated compound and apparatus containing it |
CH270845A (de) * | 1948-05-26 | 1950-09-30 | Ciba Geigy | Verfahren zum Schützen von unedlen Metallen und deren Legierungen gegen durch wässerige Salzlösungen hervorgerufene Korrosion. |
US2682563A (en) * | 1951-05-31 | 1954-06-29 | Eastman Kodak Co | Propenyl hydroquinones as antioxidants |
US2835715A (en) * | 1954-10-18 | 1958-05-20 | Phillips Petroleum Co | Automatic control of oxygen removal from process streams |
BE552224A (de) * | 1956-10-17 | |||
US3413237A (en) * | 1965-11-17 | 1968-11-26 | Exxon Research Engineering Co | Aminophenol corrosion inhibitor |
US3600411A (en) * | 1968-10-07 | 1971-08-17 | Research Corp | Redox polyester polymers |
US3728281A (en) * | 1970-04-02 | 1973-04-17 | Fisons Ltd | Corrosion inhibiting composition containing hydrazine and a pyrazolidone or an aminophenol |
US3843547A (en) * | 1972-12-26 | 1974-10-22 | Olin Corp | Composition for accelerating oxygen removal comprised of an aqueous solution of hydrazine containing a mixture of an aryl amine compound and a quinone compound |
US4096090A (en) * | 1975-08-21 | 1978-06-20 | Olin Corporation | Catalyzed hydrazine compositions and methods of their use |
US4026664A (en) * | 1975-08-21 | 1977-05-31 | Olin Corporation | Catalyzed hydrazine compound corrosion inhibiting composition containing a quinone compound and a complex of metal salt and an ortho aromatic compound |
US4079018A (en) * | 1976-02-24 | 1978-03-14 | Olin Corporation | Catalyzed hydrazine compositions and methods of their use |
US4022711A (en) * | 1976-02-24 | 1977-05-10 | Olin Corporation | Catalyzed hydrazine compound corrosion inhibiting composition containing a complex of metal salt and amino derivative of carboxylic acid, and a quinone compound |
-
1979
- 1979-12-26 US US06/107,486 patent/US4278635A/en not_active Expired - Lifetime
-
1980
- 1980-06-17 IT IT22834/80A patent/IT1140997B/it active
- 1980-06-27 CA CA000354970A patent/CA1262305A/en not_active Expired
- 1980-07-28 DE DE19803028590 patent/DE3028590A1/de active Granted
- 1980-07-29 SE SE8005448A patent/SE8005448L/ unknown
- 1980-08-12 GB GB8026192A patent/GB2060598B/en not_active Expired
- 1980-08-20 FR FR808018237A patent/FR2467246B1/fr not_active Expired
- 1980-10-10 ES ES495840A patent/ES495840A0/es active Granted
-
1985
- 1985-12-30 MY MY537/85A patent/MY8500537A/xx unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH488030A (de) * | 1966-12-14 | 1970-03-31 | Bayer Ag | Verfahren zum Korrosionsschutz von Metall |
US3983048A (en) * | 1972-12-26 | 1976-09-28 | Olin Corporation | Composition for accelerating oxygen removal comprised of a mixture of aqueous hydrazine and an aryl amine compound |
Non-Patent Citations (1)
Title |
---|
US-Z.: Journal of American Chemical Society, Vol.63, 1941, S.3441-3444 * |
Also Published As
Publication number | Publication date |
---|---|
US4278635B1 (de) | 1988-07-12 |
ES8201226A1 (es) | 1981-12-01 |
MY8500537A (en) | 1985-12-31 |
DE3028590C2 (de) | 1990-08-09 |
ES495840A0 (es) | 1981-12-01 |
IT1140997B (it) | 1986-10-10 |
GB2060598B (en) | 1983-06-02 |
FR2467246B1 (fr) | 1985-07-26 |
FR2467246A1 (fr) | 1981-04-17 |
IT8022834A0 (it) | 1980-06-17 |
GB2060598A (en) | 1981-05-07 |
US4278635A (en) | 1981-07-14 |
SE8005448L (sv) | 1981-04-13 |
CA1262305A (en) | 1989-10-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8127 | New person/name/address of the applicant |
Owner name: DEARBORN CHEMICAL CO. (N.D.GES.D. STAATES DELAWARE |
|
8127 | New person/name/address of the applicant |
Owner name: W.R. GRACE & CO., NEW YORK, N.Y., US |
|
8128 | New person/name/address of the agent |
Representative=s name: FRHR. VON UEXKUELL, J., DIPL.-CHEM. DR.RER.NAT. GR |
|
8110 | Request for examination paragraph 44 | ||
8127 | New person/name/address of the applicant |
Owner name: W.R. GRACE & CO.-CONN., NEW YORK, N.Y., US |
|
8128 | New person/name/address of the agent |
Representative=s name: FRHR. VON UEXKUELL, J., DIPL.-CHEM. DR.RER.NAT. GR |
|
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8328 | Change in the person/name/address of the agent |
Free format text: STOLBERG-WERNIGERODE, GRAF ZU, U., DIPL.-CHEM. DR.RER.NAT. SUCHANTKE, J., DIPL.-ING. HUBER, A., DIPL.-ING. KAMEKE, VON, A., DIPL.-CHEM. DR.RER.NAT. VOELKER, I., DIPL.-BIOL. FRANCK, P., DIPL.-CHEM.ETH DR.SC.TECHN., PAT.-ANWAELTE, 2000 HAMBURG |
|
8339 | Ceased/non-payment of the annual fee |