CA2051016A1 - Nickel recovery process - Google Patents
Nickel recovery processInfo
- Publication number
- CA2051016A1 CA2051016A1 CA002051016A CA2051016A CA2051016A1 CA 2051016 A1 CA2051016 A1 CA 2051016A1 CA 002051016 A CA002051016 A CA 002051016A CA 2051016 A CA2051016 A CA 2051016A CA 2051016 A1 CA2051016 A1 CA 2051016A1
- Authority
- CA
- Canada
- Prior art keywords
- nickel
- column
- loaded
- corrugated
- effluent
- 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.)
- Abandoned
Links
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 44
- 238000011084 recovery Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000470 constituent Substances 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 10
- 239000002253 acid Substances 0.000 claims abstract description 9
- 150000001768 cations Chemical class 0.000 claims abstract description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 8
- 239000011707 mineral Substances 0.000 claims abstract description 8
- 239000004576 sand Substances 0.000 claims abstract description 8
- 238000005189 flocculation Methods 0.000 claims abstract description 7
- 230000016615 flocculation Effects 0.000 claims abstract description 7
- 239000003295 industrial effluent Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003513 alkali Substances 0.000 claims abstract description 5
- 230000003197 catalytic effect Effects 0.000 claims abstract description 5
- 229910000033 sodium borohydride Inorganic materials 0.000 claims abstract description 5
- 239000012279 sodium borohydride Substances 0.000 claims abstract description 5
- 229910001379 sodium hypophosphite Inorganic materials 0.000 claims abstract description 5
- 230000014759 maintenance of location Effects 0.000 claims abstract description 4
- 150000002500 ions Chemical class 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000013522 chelant Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- 150000002815 nickel Chemical class 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 235000002639 sodium chloride Nutrition 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000007868 Raney catalyst Substances 0.000 description 2
- 229910000564 Raney nickel Inorganic materials 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 238000009903 catalytic hydrogenation reaction Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000012208 gear oil Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 210000004379 membrane Anatomy 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0453—Treatment or purification of solutions, e.g. obtained by leaching
- C22B23/0461—Treatment or purification of solutions, e.g. obtained by leaching by chemical methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0045—Plurality of essentially parallel plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0057—Settling tanks provided with contact surfaces, e.g. baffles, particles with counter-current flow direction of liquid and solid particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/009—Heating or cooling mechanisms specially adapted for settling tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/90—Regeneration or reactivation
- B01J23/94—Regeneration or reactivation of catalysts comprising metals, oxides or hydroxides of the iron group metals or copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J25/00—Catalysts of the Raney type
- B01J25/04—Regeneration or reactivation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J45/00—Ion-exchange in which a complex or a chelate is formed; Use of material as complex or chelate forming ion-exchangers; Treatment of material for improving the complex or chelate forming ion-exchange properties
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0453—Treatment or purification of solutions, e.g. obtained by leaching
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/02—Apparatus therefor
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/42—Treatment or purification of solutions, e.g. obtained by leaching by ion-exchange extraction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Removal Of Specific Substances (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Water By Ion Exchange (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4028989A DE4028989C1 (OSRAM) | 1990-09-13 | 1990-09-13 | |
| DEP4028989.3 | 1990-09-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2051016A1 true CA2051016A1 (en) | 1992-03-14 |
Family
ID=6414136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002051016A Abandoned CA2051016A1 (en) | 1990-09-13 | 1991-09-11 | Nickel recovery process |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5238663A (OSRAM) |
| EP (1) | EP0475289A1 (OSRAM) |
| JP (1) | JPH0525560A (OSRAM) |
| CA (1) | CA2051016A1 (OSRAM) |
| DE (1) | DE4028989C1 (OSRAM) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0660881A1 (en) * | 1991-07-10 | 1995-07-05 | HOEFER, Dawn Annette | Recovery of nickel |
| US5800757A (en) * | 1994-03-31 | 1998-09-01 | Modern Technologies Corp. | System and method for molding a basketball backboard |
| US5695642A (en) * | 1995-08-15 | 1997-12-09 | Greenleigh; Stephen H. | Method for purifying contaminated water |
| US6085911A (en) * | 1997-08-07 | 2000-07-11 | Greenleigh; Stephen H. | Method and apparatus for extracting metallic contaminants from substrates |
| SE9904197D0 (sv) * | 1999-11-22 | 1999-11-22 | Amersham Pharm Biotech Ab | A method for anion exchange adsorption on matrices carrying mixed mode ligands |
| US20090264679A1 (en) * | 2004-12-14 | 2009-10-22 | Daniel Ostgard | Control of metal catalyst settling rates, settling densities and improved performance via use of flocculants |
| KR101372177B1 (ko) * | 2007-05-29 | 2014-03-07 | 에보니크 데구사 게엠베하 | 활성화된 베이스 금속 촉매 |
| US9643162B2 (en) * | 2007-05-29 | 2017-05-09 | Evonik Degussa Gmbh | Activated base metal catalysts |
| US8889911B2 (en) * | 2007-05-29 | 2014-11-18 | Evonik Degussa Gmbh | Activated base metal catalysts |
| BRPI0722161A2 (pt) * | 2007-10-15 | 2014-03-18 | Evonik Degussa Gmbh | Misturas catalíticas em pó de filtragem rápida |
| ES2795810T3 (es) * | 2011-06-06 | 2020-11-24 | Atotech Deutschland Gmbh | Dispositivo y método para recuperar níquel a partir del fluido de un baño de niquelado |
| WO2016165000A1 (en) * | 2015-04-13 | 2016-10-20 | Innovation Water Clarification Inc. | System and method for separation of suspended solids from waste fluid |
| CN107475517A (zh) * | 2017-09-29 | 2017-12-15 | 洛阳栾川钼业集团股份有限公司 | 一种铼回收系统过滤装置 |
| GB2585831A (en) * | 2019-07-15 | 2021-01-27 | Klinge Chemicals Ltd | Process |
| CN113480034A (zh) * | 2021-06-30 | 2021-10-08 | 昆山市格润生环保技术有限公司 | 一种含镍电镀废水处理系统及其处理回收方法 |
| CN113620471A (zh) * | 2021-08-25 | 2021-11-09 | 珠海市科立鑫金属材料有限公司 | 一种钴萃余液的深度去除镍、钴的方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3591010A (en) * | 1968-06-10 | 1971-07-06 | Pall Corp | Filter having a microporous layer attached thereto |
| JPS555732A (en) * | 1978-06-30 | 1980-01-16 | Tatsuaki Omasa | Treating method for sewage |
| JPS5591985A (en) * | 1979-01-05 | 1980-07-11 | Showa Denko Kk | Cathode for water electrolysis and production thereof |
| JPS5591986A (en) * | 1979-01-05 | 1980-07-11 | Showa Denko Kk | Cathode for water electrolysis and production thereof |
| US4303704A (en) * | 1980-05-19 | 1981-12-01 | Courduvelis Constantine I | Selective removal of copper or nickel from complexing agents in aqueous solution |
| DD204950A1 (de) * | 1982-03-30 | 1983-12-14 | Schilling Hans Joachim | Verfahren zur behandlung von stark sauren, nickel enthaltenden loesungen aus kationenaustauscherregeneraten und galvanotechnischen abwaessern |
| FR2608457B1 (fr) * | 1986-12-19 | 1993-09-10 | Charbonnages Ste Chimique | Procede d'extraction de cations et son application au traitement d'effluents aqueux |
-
1990
- 1990-09-13 DE DE4028989A patent/DE4028989C1/de not_active Expired - Fee Related
-
1991
- 1991-09-06 EP EP91115064A patent/EP0475289A1/de not_active Withdrawn
- 1991-09-11 CA CA002051016A patent/CA2051016A1/en not_active Abandoned
- 1991-09-12 US US07/758,070 patent/US5238663A/en not_active Expired - Fee Related
- 1991-09-13 JP JP3308596A patent/JPH0525560A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0525560A (ja) | 1993-02-02 |
| US5238663A (en) | 1993-08-24 |
| EP0475289A1 (de) | 1992-03-18 |
| DE4028989C1 (OSRAM) | 1991-08-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |