DE2336496C2 - Verfahren zur Herstellung vorreduzierter Eisenoxid-Pellets mit niedrigem Schwefelgehalt - Google Patents
Verfahren zur Herstellung vorreduzierter Eisenoxid-Pellets mit niedrigem SchwefelgehaltInfo
- Publication number
- DE2336496C2 DE2336496C2 DE2336496A DE2336496A DE2336496C2 DE 2336496 C2 DE2336496 C2 DE 2336496C2 DE 2336496 A DE2336496 A DE 2336496A DE 2336496 A DE2336496 A DE 2336496A DE 2336496 C2 DE2336496 C2 DE 2336496C2
- Authority
- DE
- Germany
- Prior art keywords
- pellets
- carbon
- reduction
- sulfur
- treatment temperature
- 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
- 239000008188 pellet Substances 0.000 title claims description 144
- 229910052717 sulfur Inorganic materials 0.000 title claims description 42
- 239000011593 sulfur Substances 0.000 title claims description 42
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims description 39
- 238000000034 method Methods 0.000 title claims description 33
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 230000008569 process Effects 0.000 title claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 4
- 230000009467 reduction Effects 0.000 claims description 59
- 229910052799 carbon Inorganic materials 0.000 claims description 56
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 52
- 238000010438 heat treatment Methods 0.000 claims description 44
- 238000011282 treatment Methods 0.000 claims description 24
- 239000000654 additive Substances 0.000 claims description 21
- 239000000571 coke Substances 0.000 claims description 16
- 239000011230 binding agent Substances 0.000 claims description 14
- 238000004939 coking Methods 0.000 claims description 13
- 238000005453 pelletization Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 4
- 239000003245 coal Substances 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- GJEAMHAFPYZYDE-UHFFFAOYSA-N [C].[S] Chemical compound [C].[S] GJEAMHAFPYZYDE-UHFFFAOYSA-N 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 claims description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims 1
- 229910000019 calcium carbonate Inorganic materials 0.000 claims 1
- 239000001110 calcium chloride Substances 0.000 claims 1
- 229910001628 calcium chloride Inorganic materials 0.000 claims 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims 1
- 239000000292 calcium oxide Substances 0.000 claims 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims 1
- 229910001629 magnesium chloride Inorganic materials 0.000 claims 1
- 239000000395 magnesium oxide Substances 0.000 claims 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 1
- 108090000623 proteins and genes Proteins 0.000 claims 1
- 239000003921 oil Substances 0.000 description 22
- 239000007789 gas Substances 0.000 description 13
- 239000002245 particle Substances 0.000 description 12
- 230000008901 benefit Effects 0.000 description 9
- 238000006477 desulfuration reaction Methods 0.000 description 9
- 230000023556 desulfurization Effects 0.000 description 9
- 239000007787 solid Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 235000013980 iron oxide Nutrition 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- 238000007792 addition Methods 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 239000011294 coal tar pitch Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000003209 petroleum derivative Substances 0.000 description 3
- 239000011233 carbonaceous binding agent Substances 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910001510 metal chloride Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 101150017816 40 gene Proteins 0.000 description 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 102000011045 Chloride Channels Human genes 0.000 description 1
- 108010062745 Chloride Channels Proteins 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 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
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- 239000000370 acceptor Substances 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 229910000614 lithium tin phosphorous sulfides (LSPS) Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 210000002105 tongue Anatomy 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US273522A US3865574A (en) | 1972-07-20 | 1972-07-20 | Process for the production of low-sulfur prereduced iron pellets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2336496A1 DE2336496A1 (de) | 1974-01-31 |
| DE2336496C2 true DE2336496C2 (de) | 1982-06-24 |
Family
ID=23044284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2336496A Expired DE2336496C2 (de) | 1972-07-20 | 1973-07-18 | Verfahren zur Herstellung vorreduzierter Eisenoxid-Pellets mit niedrigem Schwefelgehalt |
Country Status (12)
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZW18288A1 (en) * | 1988-01-05 | 1989-04-19 | Middelburg Steel & Alloys Pty | Sulphur and silicon control in ferrochromium production |
| US5213742A (en) * | 1990-09-11 | 1993-05-25 | Vitaphore Corporation | Method of producing pores of controlled geometry on a thermoplastic polymer |
| CN1080315C (zh) * | 1996-03-15 | 2002-03-06 | 株式会社神户制钢所 | 生产金属铁的方法及设备 |
| BE1010766A3 (fr) * | 1996-11-25 | 1999-01-05 | Centre Rech Metallurgique | Procede pour fabriquer une eponge de fer a faible teneur en soufre. |
| US6342089B1 (en) * | 1997-09-02 | 2002-01-29 | Mcgaa John R. | Direct reduced iron pellets |
| JP4153281B2 (ja) * | 2002-10-08 | 2008-09-24 | 株式会社神戸製鋼所 | 酸化チタン含有スラグの製造方法 |
| CN102605126A (zh) * | 2005-08-30 | 2012-07-25 | 纳幕尔杜邦公司 | 矿石还原方法以及钛氧化物和铁金属化产物 |
| AU2012200914B2 (en) * | 2005-08-30 | 2012-05-03 | E. I. Du Pont De Nemours And Company | Ore reduction process and titanium oxide and iron metallization product |
| US8372179B2 (en) * | 2007-10-15 | 2013-02-12 | E I Du Pont De Nemours And Company | Ore reduction process using carbon based materials having a low sulfur content and titanium oxide and iron metallization product therefrom |
| US8202480B2 (en) * | 2009-06-25 | 2012-06-19 | Uop Llc | Apparatus for separating pitch from slurry hydrocracked vacuum gas oil |
| US8231775B2 (en) | 2009-06-25 | 2012-07-31 | Uop Llc | Pitch composition |
| US8540870B2 (en) * | 2009-06-25 | 2013-09-24 | Uop Llc | Process for separating pitch from slurry hydrocracked vacuum gas oil |
| US9150470B2 (en) | 2012-02-02 | 2015-10-06 | Uop Llc | Process for contacting one or more contaminated hydrocarbons |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2805141A (en) * | 1954-05-24 | 1957-09-03 | Univ Minnesota | Pelletizing process |
| US2811434A (en) * | 1954-12-21 | 1957-10-29 | Nat Lead Co | Process for treating ilmenite-containing materials to produce metallic iron concentrates and titanium dioxide concentrates |
| US2944884A (en) * | 1958-01-23 | 1960-07-12 | United States Steel Corp | Method of beneficiating reducing and briquetting iron ore |
| US3093474A (en) * | 1959-02-20 | 1963-06-11 | Elektrokemisk As | Process of reducing metal oxides |
| GB1008407A (en) * | 1960-12-06 | 1965-10-27 | Yawata Iron & Steel Co | Process for separating non-molten slag from titanium-containing iron sands |
| DE1262311B (de) * | 1962-06-30 | 1968-03-07 | Metallgesellschaft Ag | Verfahren und Vorrichtung zum Reduzieren von Eisenoxyden (Konzentraten) zu Eisenschwamm |
| US3314780A (en) * | 1964-07-07 | 1967-04-18 | Inland Steel Co | Process of pelletizing ore |
| US3420656A (en) * | 1966-09-02 | 1969-01-07 | Lummus Co | Process for forming hard oxide pellets and product thereof |
| US3427148A (en) * | 1966-10-10 | 1969-02-11 | Bergwerksverband Gmbh | Process of producing iron-coke bodies |
| US3495971A (en) * | 1967-05-19 | 1970-02-17 | Mcdowell Wellman Eng Co | Smelting furnace charge composition and method of making same |
| US3642465A (en) * | 1969-06-16 | 1972-02-15 | Lummus Co | Process for the production of highly prereduced oxide pellets |
-
1972
- 1972-07-20 US US273522A patent/US3865574A/en not_active Expired - Lifetime
-
1973
- 1973-07-18 JP JP8040973A patent/JPS5529132B2/ja not_active Expired
- 1973-07-18 DE DE2336496A patent/DE2336496C2/de not_active Expired
- 1973-07-19 SE SE7310086A patent/SE403137B/xx unknown
- 1973-07-19 ZA ZA734932A patent/ZA734932B/xx unknown
- 1973-07-19 BR BR5466/73A patent/BR7305466D0/pt unknown
- 1973-07-19 BE BE133681A patent/BE802581A/xx not_active IP Right Cessation
- 1973-07-19 CA CA176,814A patent/CA988722A/en not_active Expired
- 1973-07-19 GB GB3435873A patent/GB1444183A/en not_active Expired
- 1973-07-19 IT IT26800/73A patent/IT991294B/it active
- 1973-07-20 LU LU68061A patent/LU68061A1/xx unknown
- 1973-07-20 FR FR7326784A patent/FR2193879B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1444183A (en) | 1976-07-28 |
| ZA734932B (en) | 1974-06-26 |
| LU68061A1 (US06252093-20010626-C00008.png) | 1973-09-26 |
| JPS5529132B2 (US06252093-20010626-C00008.png) | 1980-08-01 |
| US3865574A (en) | 1975-02-11 |
| AU5821073A (en) | 1975-01-23 |
| DE2336496A1 (de) | 1974-01-31 |
| FR2193879A1 (US06252093-20010626-C00008.png) | 1974-02-22 |
| CA988722A (en) | 1976-05-11 |
| IT991294B (it) | 1975-07-30 |
| SE403137B (sv) | 1978-07-31 |
| BE802581A (fr) | 1973-11-16 |
| FR2193879B1 (US06252093-20010626-C00008.png) | 1980-10-17 |
| JPS4944924A (US06252093-20010626-C00008.png) | 1974-04-27 |
| BR7305466D0 (pt) | 1974-08-15 |
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Legal Events
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|---|---|---|---|
| OD | Request for examination | ||
| Q176 | The application caused the suspense of an application |
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| 8339 | Ceased/non-payment of the annual fee |