SE445209B - Pigment av syntetisk romboid magnetit - Google Patents
Pigment av syntetisk romboid magnetitInfo
- Publication number
- SE445209B SE445209B SE8001030A SE8001030A SE445209B SE 445209 B SE445209 B SE 445209B SE 8001030 A SE8001030 A SE 8001030A SE 8001030 A SE8001030 A SE 8001030A SE 445209 B SE445209 B SE 445209B
- Authority
- SE
- Sweden
- Prior art keywords
- magnetite
- particle size
- average particle
- pigment
- color strength
- Prior art date
Links
- 239000000049 pigment Substances 0.000 title description 5
- 239000002245 particle Substances 0.000 claims description 38
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 36
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 19
- 238000006243 chemical reaction Methods 0.000 description 15
- 239000000203 mixture Substances 0.000 description 14
- 238000003756 stirring Methods 0.000 description 14
- 238000005554 pickling Methods 0.000 description 12
- 239000000047 product Substances 0.000 description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 11
- 239000007788 liquid Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 11
- 239000003513 alkali Substances 0.000 description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 description 8
- 235000010216 calcium carbonate Nutrition 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 6
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 description 5
- 235000017550 sodium carbonate Nutrition 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 4
- 238000005273 aeration Methods 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- 239000001054 red pigment Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 229910021577 Iron(II) chloride Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 3
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 3
- 238000004438 BET method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 150000002505 iron Chemical class 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000003923 scrap metal Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/08—Ferroso-ferric oxide [Fe3O4]
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
- C02F1/64—Heavy metal compounds of iron or manganese
- C02F1/645—Devices for iron precipitation and treatment by air
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C09C1/22—Compounds of iron
- C09C1/24—Oxides of iron
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- 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
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- 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
- C02F2101/203—Iron or iron compound
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Nanotechnology (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Composite Materials (AREA)
- Compounds Of Iron (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Paints Or Removers (AREA)
- Hard Magnetic Materials (AREA)
- Magnetic Treatment Devices (AREA)
- Rehabilitation Tools (AREA)
- Developing Agents For Electrophotography (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US1064779A | 1979-02-09 | 1979-02-09 | |
| US7562879A | 1979-09-14 | 1979-09-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE8001030L SE8001030L (sv) | 1980-08-10 |
| SE445209B true SE445209B (sv) | 1986-06-09 |
Family
ID=26681426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8001030A SE445209B (sv) | 1979-02-09 | 1980-02-08 | Pigment av syntetisk romboid magnetit |
Country Status (14)
| Country | Link |
|---|---|
| KR (1) | KR830001565B1 (nl) |
| AR (1) | AR224757A1 (nl) |
| AU (1) | AU516998B2 (nl) |
| BR (1) | BR8000787A (nl) |
| CA (1) | CA1149582A (nl) |
| DE (1) | DE3004718C2 (nl) |
| ES (1) | ES8101517A1 (nl) |
| FR (1) | FR2448559A1 (nl) |
| GB (1) | GB2040904B (nl) |
| IT (1) | IT1147301B (nl) |
| MX (1) | MX154219A (nl) |
| NL (1) | NL181190C (nl) |
| NO (1) | NO156489C (nl) |
| SE (1) | SE445209B (nl) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3500470A1 (de) * | 1985-01-09 | 1986-07-10 | Bayer Ag, 5090 Leverkusen | Verfahren zur herstellung heller farbreiner eisenoxidrotpigmente |
| DE3500471A1 (de) * | 1985-01-09 | 1986-07-10 | Bayer Ag, 5090 Leverkusen | Verfahren zur herstellung von isometrischen magnetischen eisenoxidpigmenten |
| US5518633A (en) * | 1994-10-21 | 1996-05-21 | E. I. Du Pont De Nemours And Company | Process for treating aqueous media containing metal ions |
| DE19919791A1 (de) | 1999-04-30 | 2000-11-02 | Bayer Ag | Verfahren zur Herstellung von Fällungsmagnetiten |
| DE10043492A1 (de) | 2000-09-01 | 2002-03-14 | Bayer Ag | Verwendung von Magnetteilchen und Verfahren zu deren Herstellung |
| DE10044397A1 (de) | 2000-09-08 | 2002-03-21 | Bayer Ag | Magnetite und deren Verwendung bei der Herstellung von Tonern |
| DE10101769A1 (de) | 2001-01-17 | 2002-07-18 | Bayer Ag | Verfahren zur Herstellung von Magnetitteilchen |
| US6800260B2 (en) * | 2002-02-11 | 2004-10-05 | Millennium Inorganic Chemicals, Inc. | Processes for treating iron-containing waste streams |
| DE10209150A1 (de) | 2002-03-01 | 2003-09-11 | Bayer Ag | Verfahren zur Herstellung von Magnetitteilchen und deren Verwendung |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB190905618A (en) * | 1909-03-09 | 1910-01-13 | John Gill | Improvements in the Manufacture of Ferric Oxide. |
| US1269442A (en) * | 1917-11-10 | 1918-06-11 | Addison F Hoffman | Process of producing by-products from waste pickle liquor. |
| US1824936A (en) * | 1928-06-30 | 1931-09-29 | Ohio Sanitary Engineering Corp | Process for purifying industrial waste liquors |
| DE900257C (de) * | 1938-08-11 | 1953-12-21 | Bayer Ag | Herstellung schwarzer Eisenoxydpigmente |
| DE1263452B (de) * | 1962-11-05 | 1968-03-14 | Du Pont | Verfahren zum Aufarbeiten von verbrauchten Beizloesungen |
| US3261665A (en) * | 1962-11-05 | 1966-07-19 | Du Pont | Process for the treatment of waste sulfuric acid pickle liquor |
| US3434797A (en) * | 1967-07-27 | 1969-03-25 | Du Pont | Process for treatment of hydrochloric acid waste pickle liquor |
| GB1218601A (en) * | 1968-01-01 | 1971-01-06 | Unifloc Ltd | Disposal of waste liquors from pickling processes |
| US3617560A (en) * | 1969-09-17 | 1971-11-02 | Us Interior | Limestone neutralization of dilute acid waste waters |
| US3617562A (en) * | 1970-05-08 | 1971-11-02 | Allen Cywin | Neutralization of ferrous iron-containing acid wastes |
| US3927173A (en) * | 1974-02-22 | 1975-12-16 | Armco Steel Corp | Treatment of acid waste waters to produce ferromagnetic sludges |
| DE2518283C3 (de) * | 1975-04-24 | 1979-02-15 | Bayer Ag, 5090 Leverkusen | Verfahren zur Herstellung von Eisenoxidschwarzpigmenten |
| AU512846B2 (en) * | 1976-07-02 | 1980-10-30 | Toledo Pickling and Steel Service, Inc | System for the regeneration of waste hydrochloric acid pickle liquor |
-
1980
- 1980-02-04 CA CA000344970A patent/CA1149582A/en not_active Expired
- 1980-02-06 GB GB8003907A patent/GB2040904B/en not_active Expired
- 1980-02-07 AR AR279898A patent/AR224757A1/es active
- 1980-02-08 FR FR8002784A patent/FR2448559A1/fr active Granted
- 1980-02-08 DE DE3004718A patent/DE3004718C2/de not_active Expired
- 1980-02-08 SE SE8001030A patent/SE445209B/sv not_active IP Right Cessation
- 1980-02-08 ES ES488433A patent/ES8101517A1/es not_active Expired
- 1980-02-08 BR BR8000787A patent/BR8000787A/pt unknown
- 1980-02-08 IT IT19809/80A patent/IT1147301B/it active
- 1980-02-08 MX MX181120A patent/MX154219A/es unknown
- 1980-02-08 AU AU55383/80A patent/AU516998B2/en not_active Ceased
- 1980-02-08 NO NO800345A patent/NO156489C/no unknown
- 1980-02-08 NL NLAANVRAGE8000795,A patent/NL181190C/nl not_active IP Right Cessation
- 1980-02-08 KR KR1019800000506A patent/KR830001565B1/ko active
Also Published As
| Publication number | Publication date |
|---|---|
| IT8019809A0 (it) | 1980-02-08 |
| IT1147301B (it) | 1986-11-19 |
| NL8000795A (nl) | 1980-08-12 |
| AR224757A1 (es) | 1982-01-15 |
| AU5538380A (en) | 1980-08-14 |
| BR8000787A (pt) | 1980-10-21 |
| KR830001565B1 (ko) | 1983-08-12 |
| GB2040904A (en) | 1980-09-03 |
| AU516998B2 (en) | 1981-07-02 |
| SE8001030L (sv) | 1980-08-10 |
| ES488433A0 (es) | 1980-12-16 |
| NO156489C (no) | 1987-09-30 |
| FR2448559B1 (nl) | 1983-12-09 |
| MX154219A (es) | 1987-06-19 |
| NL181190C (nl) | 1987-07-01 |
| NL181190B (nl) | 1987-02-02 |
| FR2448559A1 (fr) | 1980-09-05 |
| CA1149582A (en) | 1983-07-12 |
| NO156489B (no) | 1987-06-22 |
| ES8101517A1 (es) | 1980-12-16 |
| DE3004718C2 (de) | 1984-07-05 |
| KR830001815A (ko) | 1983-05-19 |
| DE3004718A1 (de) | 1980-08-14 |
| NO800345L (no) | 1980-08-11 |
| GB2040904B (en) | 1983-01-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |
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