DE19623198A1 - Verfahren zur kontinuierlichen Trockengranulation von Pulverruß - Google Patents
Verfahren zur kontinuierlichen Trockengranulation von PulverrußInfo
- Publication number
- DE19623198A1 DE19623198A1 DE19623198A DE19623198A DE19623198A1 DE 19623198 A1 DE19623198 A1 DE 19623198A1 DE 19623198 A DE19623198 A DE 19623198A DE 19623198 A DE19623198 A DE 19623198A DE 19623198 A1 DE19623198 A1 DE 19623198A1
- Authority
- DE
- Germany
- Prior art keywords
- soot
- granulator
- pearl
- granulation
- dry
- 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- Withdrawn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
- 238000000034 method Methods 0.000 title claims description 26
- 239000000843 powder Substances 0.000 title claims description 19
- 238000007908 dry granulation Methods 0.000 title claims description 14
- 239000004071 soot Substances 0.000 claims description 46
- 238000005469 granulation Methods 0.000 claims description 17
- 230000003179 granulation Effects 0.000 claims description 17
- 239000011324 bead Substances 0.000 claims description 14
- 239000002054 inoculum Substances 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000011049 pearl Substances 0.000 description 41
- 239000006229 carbon black Substances 0.000 description 33
- 235000019241 carbon black Nutrition 0.000 description 33
- 239000008187 granular material Substances 0.000 description 13
- 238000005550 wet granulation Methods 0.000 description 11
- 239000008188 pellet Substances 0.000 description 10
- 238000005054 agglomeration Methods 0.000 description 7
- 230000002776 aggregation Effects 0.000 description 7
- 238000009826 distribution Methods 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 241000792859 Enema Species 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000007920 enema Substances 0.000 description 3
- 229940095399 enema Drugs 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229960005486 vaccine Drugs 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000002255 vaccination Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/44—Carbon
- C09C1/48—Carbon black
- C09C1/56—Treatment of carbon black ; Purification
- C09C1/60—Agglomerating, pelleting, or the like by dry methods
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/11—Powder tap density
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/19—Oil-absorption capacity, e.g. DBP values
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Developing Agents For Electrophotography (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Glanulating (AREA)
- Carbon And Carbon Compounds (AREA)
- Farming Of Fish And Shellfish (AREA)
- Geophysics And Detection Of Objects (AREA)
Priority Applications (22)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19623198A DE19623198A1 (de) | 1996-06-11 | 1996-06-11 | Verfahren zur kontinuierlichen Trockengranulation von Pulverruß |
| ES97108571T ES2142121T3 (es) | 1996-06-11 | 1997-05-28 | Procedimiento para la granulacion en seco continua de negro de carbono en polvo. |
| DE59701081T DE59701081D1 (de) | 1996-06-11 | 1997-05-28 | Verfahren zur kontinuierlichen Trockengranulation von Pulverruss |
| PT97108571T PT814133E (pt) | 1996-06-11 | 1997-05-28 | Processo para granulacao a seco continua de negro de fumo em po |
| EP97108571A EP0814133B1 (de) | 1996-06-11 | 1997-05-28 | Verfahren zur kontinuierlichen Trockengranulation von Pulverruss |
| IN1038CA1997 IN191978B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1996-06-11 | 1997-06-04 | |
| CZ19971726A CZ291112B6 (cs) | 1996-06-11 | 1997-06-04 | Způsob kontinuální granulace práąkových sazí za sucha |
| US08/866,245 US6231624B1 (en) | 1996-06-11 | 1997-06-05 | Process for continuous dry granulation of powered carbon black |
| EG51497A EG21101A (en) | 1996-06-11 | 1997-06-07 | Process for continuous dray granulation of powdered carbon black |
| JP9150630A JPH1060301A (ja) | 1996-06-11 | 1997-06-09 | カーボンブラック粉末の連続的乾式造粒法 |
| HR970317A HRP970317B1 (en) | 1996-06-11 | 1997-06-09 | Process for the continued dry granulation of the powdered sooth |
| HU9701029A HU220108B (hu) | 1996-06-11 | 1997-06-10 | Eljárás poralakú korom folytonosüzemű száraz granulálására |
| MYPI97002582A MY132461A (en) | 1996-06-11 | 1997-06-10 | Process for continuous dry granulation of powdered carbon black |
| ZA9705142A ZA975142B (en) | 1996-06-11 | 1997-06-10 | Process for continuous dry granulation of powdered carbon black. |
| AU24800/97A AU712127B2 (en) | 1996-06-11 | 1997-06-10 | Process for continuous dry granulation of powdered carbon black |
| CA002207525A CA2207525A1 (en) | 1996-06-11 | 1997-06-10 | Continuous dry granulation of powdered carbon black |
| CNB971129886A CN1152926C (zh) | 1996-06-11 | 1997-06-10 | 粉状炭黑连续干制粒的方法 |
| KR1019970023706A KR980002167A (ko) | 1996-06-11 | 1997-06-10 | 카본 블랙 분체의 연속 건식 입상화 방법 |
| MXPA/A/1997/004297A MXPA97004297A (en) | 1996-06-11 | 1997-06-10 | Procedure for continuous dry granulation of black smoke in po |
| TR97/00488A TR199700488A3 (tr) | 1996-06-11 | 1997-06-11 | Toz halindeki karbon siyahinin kuru olarak sürekli bir sekilde granüllenmesi için yöntem. |
| PL97320498A PL185634B1 (pl) | 1996-06-11 | 1997-06-11 | Sposób ciągłej granulacji na sucho sadzy proszkowej |
| BR9703525A BR9703525A (pt) | 1996-06-11 | 1997-06-11 | Processo de granulação a seco contínua de negro-de-fumo pulverizado |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19623198A DE19623198A1 (de) | 1996-06-11 | 1996-06-11 | Verfahren zur kontinuierlichen Trockengranulation von Pulverruß |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE19623198A1 true DE19623198A1 (de) | 1997-12-18 |
Family
ID=7796587
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19623198A Withdrawn DE19623198A1 (de) | 1996-06-11 | 1996-06-11 | Verfahren zur kontinuierlichen Trockengranulation von Pulverruß |
| DE59701081T Expired - Fee Related DE59701081D1 (de) | 1996-06-11 | 1997-05-28 | Verfahren zur kontinuierlichen Trockengranulation von Pulverruss |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE59701081T Expired - Fee Related DE59701081D1 (de) | 1996-06-11 | 1997-05-28 | Verfahren zur kontinuierlichen Trockengranulation von Pulverruss |
Country Status (20)
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19955850A1 (de) * | 1999-11-20 | 2001-06-07 | Degussa | Granulatförmige Organosilan-Präparation, Verfahren zu ihrer Herstellung und ihre Verwendung |
| EP1215249A1 (de) | 2000-12-16 | 2002-06-19 | Degussa AG | Perlruss |
| US7560414B2 (en) | 2001-08-31 | 2009-07-14 | Degussa Ag | Adsorbents, process for the production thereof and use thereof |
| WO2014001539A1 (de) * | 2012-06-29 | 2014-01-03 | Pyrolyx Ag | Verfahren und vorrichtung zur herstellung von hybrid-carbon black-teilchen |
| EP2913368A1 (en) * | 2014-02-28 | 2015-09-02 | Orion Engineered Carbons GmbH | Pelleted acetylene black |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19756501A1 (de) * | 1997-12-18 | 1999-06-24 | Degussa | Perlruß und Verfahren zu seiner Herstellung |
| DE10309957A1 (de) * | 2003-03-07 | 2004-09-23 | Degussa Ag | Rußperlen |
| DE10351737A1 (de) * | 2003-11-06 | 2005-06-16 | Degussa Ag | Ruß |
| US20050100502A1 (en) * | 2003-11-06 | 2005-05-12 | Kai Krauss | Carbon black |
| DE102007026214A1 (de) * | 2007-06-05 | 2008-12-11 | Evonik Degussa Gmbh | Flammruß |
| DE102008043641A1 (de) | 2008-11-11 | 2010-05-20 | Evonik Degussa Gmbh | Rußgranulat, Verfahren zur Herstellung von Rußgranulat und dessen Verwendung |
| BR112012019501B1 (pt) * | 2010-02-03 | 2019-09-24 | Aditya Birla Nuvo Limited | Procedimento para a preparação de peletes de negro-de-fumo |
| IT1399692B1 (it) | 2010-03-30 | 2013-04-26 | Soremartec Sa | Metodo e impianto per la preparazione di un prodotto granulato |
| JP5813985B2 (ja) * | 2011-04-19 | 2015-11-17 | 株式会社ブリヂストン | ゴム物品補強用炭化物の製造方法 |
| CN106390858A (zh) * | 2016-11-04 | 2017-02-15 | 云南中翼鼎东能源科技开发有限公司 | 一种适用于煤泥粉尘回收的造粒成型设备 |
| DE102016015591A1 (de) | 2016-12-28 | 2018-06-28 | Zeppelin Systems Gmbh | Verfahren zur Aufbereitung von Carbon Black und Herstellungsverfahren eines Pre-Compounds für eine Gummi-Mischerei |
| FR3075826B1 (fr) | 2017-12-22 | 2019-12-20 | Nanomakers | Procede de fabrication incorporant des particules a base de silicium |
| WO2025143686A1 (ko) * | 2023-12-26 | 2025-07-03 | 오씨아이 주식회사 | 일반 카본블랙 및 재생 카본블랙을 이용한 고품질의 카본블랙 분말 및 그 제조 방법 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB404452A (en) * | 1932-07-18 | 1934-01-18 | Cabot Godfrey L Inc | A method of treating carbon black |
| DE859509C (de) * | 1941-12-23 | 1952-12-15 | Chemische Werke Huels Ges Mit | Verfahren zum Verdichten von Russ |
| DE1054617B (de) * | 1954-12-06 | 1959-04-09 | Cabot Godfrey L Inc | Verfahren zum Verdichten von Farbruss |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2120540A (en) * | 1932-07-18 | 1938-06-14 | Cabot Godfrey L Inc | Manufacture of carbon black |
| US2131686A (en) * | 1936-05-09 | 1938-09-27 | Gen Atlas Carbon Company | Granular carbon black and method for manufacture |
| US2306698A (en) * | 1940-01-19 | 1942-12-29 | George L Heller | Agglomerating apparatus |
| US2293439A (en) * | 1941-06-07 | 1942-08-18 | Dwight & Lloyd Sintering Compa | Apparatus for making noudles or pellets |
| US2422989A (en) * | 1944-12-21 | 1947-06-24 | United Carbon Company Inc | Rotary pelleting of furnace blacks |
| US2758039A (en) * | 1954-03-17 | 1956-08-07 | Huber Corp J M | Method of compacting carbon black |
| US2807523A (en) * | 1954-04-12 | 1957-09-24 | Phillips Petroleum Co | Pelleting of carbon black |
| US2838191A (en) * | 1957-06-11 | 1958-06-10 | Arthur G Schramm | Elevatable bed vehicle |
| US3333038A (en) * | 1965-01-18 | 1967-07-25 | Continental Carbon Co | Method for wet pelletizing carbon black |
| US3607086A (en) * | 1970-02-24 | 1971-09-21 | George W Dingus | Apparatus for wet-pelletizing carbon black |
| US3825233A (en) * | 1972-02-14 | 1974-07-23 | Phillips Petroleum Co | Carbon black pelleter |
| US3787161A (en) * | 1972-05-25 | 1974-01-22 | Boardman Co | Carbon black pelletizer |
| US4162287A (en) * | 1978-01-23 | 1979-07-24 | Phillips Petroleum Company | Apparatus for pelleting flocculent particles |
| JPS5651957Y2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1978-05-11 | 1981-12-04 | ||
| DE3908022C1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1988-09-23 | 1990-03-29 | Degussa Ag, 6000 Frankfurt, De |
-
1996
- 1996-06-11 DE DE19623198A patent/DE19623198A1/de not_active Withdrawn
-
1997
- 1997-05-28 ES ES97108571T patent/ES2142121T3/es not_active Expired - Lifetime
- 1997-05-28 DE DE59701081T patent/DE59701081D1/de not_active Expired - Fee Related
- 1997-05-28 EP EP97108571A patent/EP0814133B1/de not_active Expired - Lifetime
- 1997-05-28 PT PT97108571T patent/PT814133E/pt unknown
- 1997-06-04 IN IN1038CA1997 patent/IN191978B/en unknown
- 1997-06-04 CZ CZ19971726A patent/CZ291112B6/cs not_active IP Right Cessation
- 1997-06-05 US US08/866,245 patent/US6231624B1/en not_active Expired - Fee Related
- 1997-06-07 EG EG51497A patent/EG21101A/xx active
- 1997-06-09 JP JP9150630A patent/JPH1060301A/ja active Pending
- 1997-06-09 HR HR970317A patent/HRP970317B1/xx not_active IP Right Cessation
- 1997-06-10 HU HU9701029A patent/HU220108B/hu not_active IP Right Cessation
- 1997-06-10 CN CNB971129886A patent/CN1152926C/zh not_active Expired - Fee Related
- 1997-06-10 KR KR1019970023706A patent/KR980002167A/ko not_active Abandoned
- 1997-06-10 ZA ZA9705142A patent/ZA975142B/xx unknown
- 1997-06-10 CA CA002207525A patent/CA2207525A1/en not_active Abandoned
- 1997-06-10 AU AU24800/97A patent/AU712127B2/en not_active Ceased
- 1997-06-10 MY MYPI97002582A patent/MY132461A/en unknown
- 1997-06-11 PL PL97320498A patent/PL185634B1/pl not_active IP Right Cessation
- 1997-06-11 TR TR97/00488A patent/TR199700488A3/tr unknown
- 1997-06-11 BR BR9703525A patent/BR9703525A/pt not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB404452A (en) * | 1932-07-18 | 1934-01-18 | Cabot Godfrey L Inc | A method of treating carbon black |
| DE859509C (de) * | 1941-12-23 | 1952-12-15 | Chemische Werke Huels Ges Mit | Verfahren zum Verdichten von Russ |
| DE1054617B (de) * | 1954-12-06 | 1959-04-09 | Cabot Godfrey L Inc | Verfahren zum Verdichten von Farbruss |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19955850A1 (de) * | 1999-11-20 | 2001-06-07 | Degussa | Granulatförmige Organosilan-Präparation, Verfahren zu ihrer Herstellung und ihre Verwendung |
| US6410769B1 (en) | 1999-11-20 | 2002-06-25 | Degussa Muls Ag | Granular organosilane preparation, process for the production thereof and use thereof |
| EP1215249A1 (de) | 2000-12-16 | 2002-06-19 | Degussa AG | Perlruss |
| US7112618B2 (en) | 2000-12-16 | 2006-09-26 | Degussa Ag | Beaded black |
| KR100818064B1 (ko) * | 2000-12-16 | 2008-03-31 | 에보니크 데구사 게엠베하 | 펠렛화 블랙 및 이의 제조방법 |
| US7695546B2 (en) | 2001-08-31 | 2010-04-13 | Evonik Degussa Gmbh | Absorbents, process for the production thereof and use thereof |
| US7560414B2 (en) | 2001-08-31 | 2009-07-14 | Degussa Ag | Adsorbents, process for the production thereof and use thereof |
| WO2014001539A1 (de) * | 2012-06-29 | 2014-01-03 | Pyrolyx Ag | Verfahren und vorrichtung zur herstellung von hybrid-carbon black-teilchen |
| US9676943B2 (en) | 2012-06-29 | 2017-06-13 | Prolyx AG | Process for producing hybrid carbon black particles |
| US9938465B2 (en) | 2012-06-29 | 2018-04-10 | Pyrolyx Ag | Apparatus for producing hybrid carbon black particles |
| EP2913368A1 (en) * | 2014-02-28 | 2015-09-02 | Orion Engineered Carbons GmbH | Pelleted acetylene black |
| WO2015128278A1 (en) * | 2014-02-28 | 2015-09-03 | Orion Engineered Carbons Gmbh | Pelleted acetylene black |
| US10179859B2 (en) | 2014-02-28 | 2019-01-15 | Orion Engineered Carbons Gmbh | Pelleted acetylene black |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1060301A (ja) | 1998-03-03 |
| BR9703525A (pt) | 1999-01-05 |
| CN1152926C (zh) | 2004-06-09 |
| HU220108B (hu) | 2001-10-28 |
| CN1171418A (zh) | 1998-01-28 |
| AU712127B2 (en) | 1999-10-28 |
| MX9704297A (es) | 1998-06-30 |
| DE59701081D1 (de) | 2000-03-09 |
| PL185634B1 (pl) | 2003-06-30 |
| HRP970317A2 (en) | 1998-02-28 |
| EP0814133B1 (de) | 2000-02-02 |
| MY132461A (en) | 2007-10-31 |
| EP0814133A1 (de) | 1997-12-29 |
| HU9701029D0 (en) | 1997-08-28 |
| ES2142121T3 (es) | 2000-04-01 |
| KR980002167A (ko) | 1998-03-30 |
| CZ291112B6 (cs) | 2002-12-11 |
| AU2480097A (en) | 1997-12-18 |
| US6231624B1 (en) | 2001-05-15 |
| CA2207525A1 (en) | 1997-12-11 |
| PT814133E (pt) | 2000-06-30 |
| HRP970317B1 (en) | 2001-12-31 |
| PL320498A1 (en) | 1997-12-22 |
| EG21101A (en) | 2000-11-29 |
| IN191978B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 2004-01-31 |
| HUP9701029A1 (hu) | 2000-05-28 |
| TR199700488A2 (xx) | 1997-12-21 |
| ZA975142B (en) | 1998-01-05 |
| TR199700488A3 (tr) | 1997-12-21 |
| CZ172697A3 (en) | 1997-12-17 |
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