EP0029038B1 - Produit pour la desulfuration des fontes et aciers - Google Patents
Produit pour la desulfuration des fontes et aciers Download PDFInfo
- Publication number
- EP0029038B1 EP0029038B1 EP80900923A EP80900923A EP0029038B1 EP 0029038 B1 EP0029038 B1 EP 0029038B1 EP 80900923 A EP80900923 A EP 80900923A EP 80900923 A EP80900923 A EP 80900923A EP 0029038 B1 EP0029038 B1 EP 0029038B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- granulated
- magnesium
- product according
- slag
- metal
- 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
- 239000010959 steel Substances 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 title claims description 10
- 235000000396 iron Nutrition 0.000 title abstract description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 70
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 48
- 239000011777 magnesium Substances 0.000 claims abstract description 48
- 239000002893 slag Substances 0.000 claims abstract description 28
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 7
- 239000004571 lime Substances 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000012159 carrier gas Substances 0.000 claims abstract description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 3
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 8
- -1 alkali metal borates Chemical class 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910001122 Mischmetal Inorganic materials 0.000 claims description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 235000013024 sodium fluoride Nutrition 0.000 claims description 2
- 238000007514 turning Methods 0.000 claims description 2
- 241000282887 Suidae Species 0.000 claims 3
- 238000001033 granulometry Methods 0.000 claims 2
- 241000022563 Rema Species 0.000 claims 1
- 229910052783 alkali metal Inorganic materials 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 239000000956 alloy Substances 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- 229910001634 calcium fluoride Inorganic materials 0.000 claims 1
- 239000011775 sodium fluoride Substances 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 27
- 239000007924 injection Substances 0.000 abstract description 27
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 13
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 4
- 238000007670 refining Methods 0.000 abstract description 4
- 229910000861 Mg alloy Inorganic materials 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 15
- 239000008187 granular material Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 238000005469 granulation Methods 0.000 description 6
- 230000003179 granulation Effects 0.000 description 6
- 238000006477 desulfuration reaction Methods 0.000 description 5
- 230000023556 desulfurization Effects 0.000 description 5
- 235000001508 sulfur Nutrition 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000003009 desulfurizing effect Effects 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 206010061218 Inflammation Diseases 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 235000013365 dairy product Nutrition 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- 239000011019 hematite Substances 0.000 description 2
- 230000004054 inflammatory process Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 206010001488 Aggression Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- SMDQFHZIWNYSMR-UHFFFAOYSA-N sulfanylidenemagnesium Chemical compound S=[Mg] SMDQFHZIWNYSMR-UHFFFAOYSA-N 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
Definitions
- the present invention relates to a new product for the desulfurization of refining and molding irons, and of steels, and for the nodulization of molding irons, product particularly well suited for direct injection, with a lance, in a gas stream.
- magnesium is absorbed on a porous support such as coke (French patent n ° 1 417 474 of American Cast Iron Pipe Company) or a porous ceramic (French patent n ° 1 357511 of Foseco Trading AG), or on an iron sponge (French patent No. 1,568,576 to Jarnforadling).
- a porous support such as coke (French patent n ° 1 417 474 of American Cast Iron Pipe Company) or a porous ceramic (French patent n ° 1 357511 of Foseco Trading AG), or on an iron sponge (French patent No. 1,568,576 to Jarnforadling).
- magnesium is mixed with a diluent, which can also play a role in the desulfurization process, such as lime, in particular in FR-A-1 125 154, 1 168 646, 1 168750 of l 'Institut deInstitut de fürs de la Sidérurgie, and in French patent FR-A-2,331,621 to Jones and Laughlin Steel Co.
- lime and magnesium are stored in two separate containers, and are mixed at the time of use, by simultaneous shipment in a predetermined proportion, in the injection pipe.
- the magnesium is coated with an inert substance (metal oxides, halogenated salts).
- the present invention satisfactorily solves the problem of injecting magnesium into a bath of cast iron or liquid steel, and ensures both personnel safety, regularity of operation, obtaining '' a minimum sulfur content and simplifies handling.
- a product for the desulfurization of cast irons and steels in the liquid state, by injection with a lance in a stream of carrier gas characterized in that it comprises, by weight, from 10 to 90%, preferably 20 to 80 %, granulated slag, the rest being magnesium shot.
- the granulated slag is obtained by granulation of slags of particular composition, either by pouring the molten slag in water, or by granulation in a jet of gas or steam, followed by drying and sieving.
- dairy products with a basic character are particularly well suited, with a basicity index greater than 1 and preferably greater than 2, which may contain, in addition to lime, alumina, silica and magnesia, one or more additional constituent (s) such as calcium fluorides or sodium fluorides, alkali metal oxides, alkali and alkaline earth metal borates which allow to adjust the melting point or viscosity or any other physico-chemical characteristic.
- Basicity can be identified by the weight index
- Magnesium shot can be obtained by any known means which makes it possible to give the particles a shape with rounded contours, free of sharp edges, which is essential for ensuring the product, object of the invention, good flow characteristics in the pipes and in the injection lance.
- the particle size can be chosen within relatively wide limits. In practice, a particle size between 0.1 and 3 mm, and preferably between 0.3 and 2 mm, gives the best results in terms of the use of the desulphurizing or inoculating product.
- the shot consists of unalloyed magnesium, containing the usual impurities; but it is also possible, depending on the results sought, either to facilitate the shaping of magnesium in the shot state, or to give cast iron or steel special properties, use shot which may contain, in addition to the magnesium, at least one additional element chosen from aluminum, up to 25% by weight, calcium up to 25% by weight, silicon up to 10% by weight, and one or more metals from the group of earths rare or their mixture called mischmetall, from 0.1 to 10% by weight.
- the desulphurizing or nodulating product which is the subject of the invention comprises varying proportions of granules and slag, depending on the applications. If one refers, for example, to the desulfurization of a hematite refining pig, it is known that the operation, for various reasons, should not last more than 6 to 8 minutes. Given the initial and final sulfur content targeted and the magnesium yield and the flow rate of the injection lance, it is easy to calculate the theoretical quantity of magnesium required, and adjust the mixture accordingly. It is thus possible, by adjusting the magnesium / milk ratio, to regulate the flow rate, the duration and the efficiency of the desulfurizing injection.
- composition intervals ranging from 10 to 90% (by weight) of magnesium shot, and from 90 to 10% of granulated slag make it possible to resolve all the cases which arise, the preferred compositions being in the range of 20 to 80% magnesium shot and 80 to 20% granulated slag.
- This slag comes from the manufacture of magnesium by the "Magnétherm” process, as described in French patents Nos. 1,194,556, 2,204,697 and 2,395,319. It was granulated by casting, in the state melted, in a large body of water, then dried and calibrated by sieving.
- the magnesium used was obtained by the same Magnetherm process with a magnesium titer greater than 99.5% and a particle size of 0.3 to 1.6 mm.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7913279 | 1979-03-15 | ||
| FR7913279A FR2456779A1 (fr) | 1979-05-15 | 1979-05-15 | Produit pour la desulfuration des fontes et aciers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0029038A1 EP0029038A1 (fr) | 1981-05-27 |
| EP0029038B1 true EP0029038B1 (fr) | 1983-11-30 |
Family
ID=9225838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80900923A Expired EP0029038B1 (fr) | 1979-05-15 | 1980-12-01 | Produit pour la desulfuration des fontes et aciers |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US4364771A (en:Method) |
| EP (1) | EP0029038B1 (en:Method) |
| JP (1) | JPS5942725B2 (en:Method) |
| AR (1) | AR219255A1 (en:Method) |
| AU (1) | AU532686B2 (en:Method) |
| BE (1) | BE883297A (en:Method) |
| BR (1) | BR8008679A (en:Method) |
| CA (1) | CA1150058A (en:Method) |
| DE (1) | DE3065758D1 (en:Method) |
| FR (1) | FR2456779A1 (en:Method) |
| IN (1) | IN152626B (en:Method) |
| IT (1) | IT1140849B (en:Method) |
| MX (1) | MX153816A (en:Method) |
| RO (1) | RO81381B (en:Method) |
| WO (1) | WO1980002565A1 (en:Method) |
| ZA (1) | ZA802844B (en:Method) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4490173A (en) * | 1982-09-30 | 1984-12-25 | Schwer John W | Steelmaking additive composition |
| US4684403A (en) * | 1986-06-19 | 1987-08-04 | Elkem Metals Company | Dephosphorization process for manganese-containing alloys |
| US4853034A (en) * | 1987-04-13 | 1989-08-01 | Quigley Joseph R | Method of ladle desulfurizing molten steel |
| FR2630131B1 (fr) * | 1988-04-14 | 1990-08-03 | Affival | Procede de desulfuration des fontes |
| US4752327A (en) * | 1987-05-08 | 1988-06-21 | Elkem Metals Company | Dephosphorization process for manganese alloys |
| DE3910776A1 (de) * | 1988-05-10 | 1989-11-23 | Fischer Ag Georg | Verfahren zur behandlung von gusseisenschmelzen in einer offenen pfanne mittels reinmagnesium |
| DE4002284A1 (de) * | 1989-12-04 | 1991-06-06 | Foseco Int | Mittel zum entschwefeln von eisenschmelzen |
| US5021086A (en) * | 1990-07-05 | 1991-06-04 | Reactive Metals And Alloys Corporation | Iron desulfurization additive and method for introduction into hot metal |
| US5358550A (en) * | 1992-10-26 | 1994-10-25 | Rossborough Manufacturing Company | Desulfurization agent |
| US5397379A (en) * | 1993-09-22 | 1995-03-14 | Oglebay Norton Company | Process and additive for the ladle refining of steel |
| DE19502302C2 (de) * | 1995-01-26 | 1996-12-05 | Deumu Deutsche Erz Und Metall | Mittel zur Entschwefelung von Eisenschmelzen |
| US6179895B1 (en) | 1996-12-11 | 2001-01-30 | Performix Technologies, Ltd. | Basic tundish flux composition for steelmaking processes |
| DE19654501C1 (de) * | 1996-12-18 | 1998-08-20 | Mannesmann Ag | Verfahren zur Roheisenentschwefelung |
| US6989040B2 (en) * | 2002-10-30 | 2006-01-24 | Gerald Zebrowski | Reclaimed magnesium desulfurization agent |
| JP4167101B2 (ja) * | 2003-03-20 | 2008-10-15 | 株式会社神戸製鋼所 | 粒状金属鉄の製法 |
| US7731778B2 (en) * | 2006-03-27 | 2010-06-08 | Magnesium Technologies Corporation | Scrap bale for steel making process |
| FR3018524B1 (fr) * | 2014-03-11 | 2017-03-10 | Affival | Procede de desulfuration d'une fonte liquide et fil fourre pour sa mise en oeuvre |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1684685A (en) * | 1925-01-06 | 1928-09-18 | Elmer H Records | Liquid fuel |
| FR1116581A (fr) * | 1953-12-30 | 1956-05-09 | Union Carbide & Carbon Corp | Fabrication de la fonte |
| FR1125154A (fr) | 1955-04-28 | 1956-10-25 | Siderurgie Fse Inst Rech | Procédé pour désulfurer les métaux en fusion et en particulièr la fonte |
| FR1166661A (fr) * | 1956-02-10 | 1958-11-13 | Union Carbide & Carbon Corp | Procédé et agent de traitement de produits ferreux |
| FR1168646A (fr) | 1957-02-21 | 1958-12-11 | Siderurgie Fse Inst Rech | Procédé d'insufflation pour désulfurer les métaux en fusion, en particulier la fonte et l'acier |
| FR1168750A (fr) | 1957-03-02 | 1958-12-15 | Siderurgie Fse Inst Rech | Affinage des fontes par insufflation de chaux pulvérulente et d'oxygène |
| US2971833A (en) * | 1958-04-09 | 1961-02-14 | Le Magnesium Thermique Soc | Process of manufacturing magnesium |
| US3765848A (en) * | 1971-01-22 | 1973-10-16 | G Brent | Motor fuel composition |
| US3957502A (en) * | 1971-11-17 | 1976-05-18 | Magnesium Elektron Limited | Addition of magnesium to molten metal |
| US4020798A (en) * | 1972-10-27 | 1977-05-03 | Skala Stephen F | Internal combustion engine fueled by NaK |
| US3953198A (en) * | 1973-08-03 | 1976-04-27 | N L Industries, Inc. | Method for treating molten iron using a magnesium infiltrated metal network |
| US3969105A (en) * | 1974-12-27 | 1976-07-13 | The Dow Chemical Company | Treating agent for high melting temperature metals |
| US4110082A (en) * | 1975-02-25 | 1978-08-29 | Michaels Christopher Van | Reformed hydrocarbons and alcohols from fuel alloys and reforming agents |
| US3998625A (en) * | 1975-11-12 | 1976-12-21 | Jones & Laughlin Steel Corporation | Desulfurization method |
| US4088454A (en) * | 1976-10-26 | 1978-05-09 | Ki Hyun Lee | Method for producing a liquid fuel composition |
| US4081252A (en) * | 1976-06-16 | 1978-03-28 | Hans Osborg | Method of improving combustion of fuels and fuel compositions |
| FR2395319A1 (fr) * | 1977-06-24 | 1979-01-19 | Sofrem | Perfectionnements aux procedes de production de magnesium par voie thermique |
-
1979
- 1979-05-15 FR FR7913279A patent/FR2456779A1/fr active Granted
-
1980
- 1980-04-24 IN IN475/CAL/80A patent/IN152626B/en unknown
- 1980-05-08 IT IT21891/80A patent/IT1140849B/it active
- 1980-05-12 US US06/224,535 patent/US4364771A/en not_active Expired - Fee Related
- 1980-05-12 AU AU59824/80A patent/AU532686B2/en not_active Ceased
- 1980-05-12 DE DE8080900923T patent/DE3065758D1/de not_active Expired
- 1980-05-12 RO RO102896A patent/RO81381B/ro unknown
- 1980-05-12 WO PCT/FR1980/000073 patent/WO1980002565A1/fr active IP Right Grant
- 1980-05-12 JP JP55501086A patent/JPS5942725B2/ja not_active Expired
- 1980-05-12 BR BR8008679A patent/BR8008679A/pt not_active IP Right Cessation
- 1980-05-13 MX MX182303A patent/MX153816A/es unknown
- 1980-05-13 ZA ZA00802844A patent/ZA802844B/xx unknown
- 1980-05-14 CA CA000351885A patent/CA1150058A/fr not_active Expired
- 1980-05-14 BE BE0/200613A patent/BE883297A/fr not_active IP Right Cessation
- 1980-05-15 AR AR281068A patent/AR219255A1/es active
- 1980-12-01 EP EP80900923A patent/EP0029038B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| WO1980002565A1 (fr) | 1980-11-27 |
| IT1140849B (it) | 1986-10-10 |
| AU5982480A (en) | 1981-01-15 |
| FR2456779B1 (en:Method) | 1984-10-05 |
| JPS5942725B2 (ja) | 1984-10-17 |
| MX153816A (es) | 1987-01-19 |
| DE3065758D1 (en) | 1984-01-05 |
| US4364771A (en) | 1982-12-21 |
| IT8021891A0 (it) | 1980-05-08 |
| RO81381B (ro) | 1984-11-30 |
| EP0029038A1 (fr) | 1981-05-27 |
| FR2456779A1 (fr) | 1980-12-12 |
| ZA802844B (en) | 1981-05-27 |
| BE883297A (fr) | 1980-11-14 |
| RO81381A (ro) | 1984-11-25 |
| AR219255A1 (es) | 1980-07-31 |
| CA1150058A (fr) | 1983-07-19 |
| AU532686B2 (en) | 1983-10-06 |
| JPS56500302A (en:Method) | 1981-03-12 |
| BR8008679A (pt) | 1981-04-14 |
| IN152626B (en:Method) | 1984-02-25 |
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