NO302748B1 - Fremgangsmåte ved fremstilling av svovelsyre - Google Patents
Fremgangsmåte ved fremstilling av svovelsyre Download PDFInfo
- Publication number
- NO302748B1 NO302748B1 NO905312A NO905312A NO302748B1 NO 302748 B1 NO302748 B1 NO 302748B1 NO 905312 A NO905312 A NO 905312A NO 905312 A NO905312 A NO 905312A NO 302748 B1 NO302748 B1 NO 302748B1
- Authority
- NO
- Norway
- Prior art keywords
- sulfuric acid
- gas
- particles
- smoke
- content
- Prior art date
Links
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 214
- 238000000034 method Methods 0.000 title claims description 38
- 239000007789 gas Substances 0.000 claims abstract description 137
- 239000002245 particle Substances 0.000 claims abstract description 83
- 239000000779 smoke Substances 0.000 claims abstract description 38
- 239000000443 aerosol Substances 0.000 claims abstract description 16
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 12
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims abstract description 11
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 4
- 238000010891 electric arc Methods 0.000 claims abstract description 4
- 229920001296 polysiloxane Polymers 0.000 claims abstract 3
- 239000000203 mixture Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 6
- 230000003197 catalytic effect Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- -1 siloxanes Chemical class 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 239000002912 waste gas Substances 0.000 claims description 2
- 239000002803 fossil fuel Substances 0.000 claims 1
- 150000004677 hydrates Chemical class 0.000 claims 1
- 230000003134 recirculating effect Effects 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- 239000000725 suspension Substances 0.000 claims 1
- 239000002253 acid Substances 0.000 abstract description 50
- 239000003595 mist Substances 0.000 abstract description 35
- 238000010899 nucleation Methods 0.000 abstract description 11
- 230000006911 nucleation Effects 0.000 abstract description 8
- 238000003466 welding Methods 0.000 abstract description 7
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 18
- 239000003921 oil Substances 0.000 description 11
- 238000009833 condensation Methods 0.000 description 10
- 230000005494 condensation Effects 0.000 description 10
- 239000011521 glass Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 7
- 238000007664 blowing Methods 0.000 description 6
- 239000004809 Teflon Substances 0.000 description 5
- 229920006362 Teflon® Polymers 0.000 description 5
- 239000003496 welding fume Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000003517 fume Substances 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000006735 deficit Effects 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000001117 sulphuric acid Substances 0.000 description 2
- 235000011149 sulphuric acid Nutrition 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
- C01B17/76—Preparation by contact processes
- C01B17/80—Apparatus
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
- C01B17/76—Preparation by contact processes
- C01B17/80—Apparatus
- C01B17/806—Absorbers; Heat exchangers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—Sulfur oxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
- C01B17/76—Preparation by contact processes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Treating Waste Gases (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Catalysts (AREA)
- Filtering Materials (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Sludge (AREA)
- Cleaning Or Drying Semiconductors (AREA)
- Coloring (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Chimneys And Flues (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK312588A DK168701B1 (da) | 1988-06-09 | 1988-06-09 | Fremgangsmåde til ved fremstilling af svovlsyre at udkondensere svovlsyredampe |
| PCT/DK1989/000133 WO1989012025A1 (en) | 1988-06-09 | 1989-05-22 | Condensing sulfuric acid vapours to produce sulfuric acid |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO905312D0 NO905312D0 (no) | 1990-12-07 |
| NO905312L NO905312L (no) | 1991-01-16 |
| NO302748B1 true NO302748B1 (no) | 1998-04-20 |
Family
ID=8119386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO905312A NO302748B1 (no) | 1988-06-09 | 1990-12-07 | Fremgangsmåte ved fremstilling av svovelsyre |
Country Status (23)
| Country | Link |
|---|---|
| US (1) | US5198206A (pl) |
| EP (1) | EP0419539B1 (pl) |
| JP (1) | JP2823618B2 (pl) |
| KR (1) | KR970007426B1 (pl) |
| CN (1) | CN1022310C (pl) |
| AT (1) | ATE118201T1 (pl) |
| AU (1) | AU625971B2 (pl) |
| BR (1) | BR8907477A (pl) |
| CA (1) | CA1338815C (pl) |
| CZ (1) | CZ284443B6 (pl) |
| DD (1) | DD283980A5 (pl) |
| DE (1) | DE68921074T2 (pl) |
| DK (1) | DK168701B1 (pl) |
| ES (1) | ES2013540A6 (pl) |
| FI (1) | FI91518C (pl) |
| HU (1) | HU207686B (pl) |
| IE (1) | IE66568B1 (pl) |
| NO (1) | NO302748B1 (pl) |
| PL (1) | PL163855B1 (pl) |
| RU (1) | RU1838232C (pl) |
| SK (1) | SK279647B6 (pl) |
| TR (1) | TR25214A (pl) |
| WO (1) | WO1989012025A1 (pl) |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK168702B1 (da) * | 1988-06-02 | 1994-05-24 | Topsoe Haldor As | Fremgangsmåde ved fremstilling af svovlsyre og apparat til anvendelse ved udøvelse af fremgangsmåden |
| FR2669027B1 (fr) * | 1990-11-13 | 1992-12-31 | Rhone Poulenc Chimie | Procede de fabrication d'oxalates doubles de terres rares et d'ammonium et leurs utilisations pour la fabrication d'oxydes de terres rares et oxydes de terres rares obtenus. |
| DE4114468C1 (pl) * | 1991-05-03 | 1992-12-10 | Hartmann & Braun Ag, 6000 Frankfurt, De | |
| DK167910B1 (da) * | 1991-05-24 | 1994-01-03 | Topsoe Haldor As | Fremgangsmaade til fjernelse af svovloxider fra afgasser |
| US6287534B1 (en) * | 1994-03-28 | 2001-09-11 | Ping Wha Lin | Method for manufacturing sulfuric acid |
| JPH08337406A (ja) * | 1995-06-15 | 1996-12-24 | Sumitomo Chem Co Ltd | 高純度硫酸の製造方法 |
| ES2157513T3 (es) * | 1996-11-26 | 2001-08-16 | Haldor Topsoe As | Procedimiento de concentracion de acido sulfurico. |
| ATE240772T1 (de) * | 1997-01-06 | 2003-06-15 | Haldor Topsoe As | Verfahren zur entschwefelung von gasen |
| DE19705897A1 (de) * | 1997-02-15 | 1998-08-27 | Veba Kraftwerke Ruhr | Verfahren zur Unterdrückung der Bildung von Schwefelsäureaerosolen in Abgasreinigungsanlagen |
| CN1111078C (zh) * | 1999-12-30 | 2003-06-11 | 赵善茂 | 一种锅炉烟气的综合利用方法 |
| JP4171300B2 (ja) | 2000-07-25 | 2008-10-22 | フェルプス ドッジ コーポレイション | 硫酸の生成および金属の回収のために高温圧力浸出を使用する元素硫黄含有材料の処理 |
| EP1443022B1 (en) * | 2003-01-18 | 2008-05-21 | Haldor Topsoe A/S | Process for condensation of sulphuric acid vapours to produce sulphuric acid |
| DE602005021003D1 (de) | 2004-02-27 | 2010-06-17 | Haldor Topsoe As | Vorrichtung zum Mischen von Fluidströmen |
| US7448794B2 (en) | 2004-02-27 | 2008-11-11 | Haldor Topsoe A/S | Method for mixing fluid streams |
| ATE527907T1 (de) * | 2004-04-23 | 2011-10-15 | Panasonic Elec Works Co Ltd | Gebläseheizung mit elektrostatischem zerstäuber |
| US7361326B2 (en) * | 2005-11-15 | 2008-04-22 | Haldor Topsoe A/S | Process for the production of sulfuric acid |
| BRPI0704106B1 (pt) * | 2006-09-25 | 2017-04-25 | Haldor Topsoe As | processo para a produção de ácido sulfúrico |
| CA2670295C (en) * | 2006-11-29 | 2012-10-16 | Kurt Agerbaek Christensen | Process for the production of sulfuric acid |
| EP2163515B1 (en) | 2008-09-12 | 2015-03-25 | Haldor Topsoe A/S | Process for the production of sulphuric acid |
| WO2010108677A2 (en) | 2009-03-26 | 2010-09-30 | Haldor Topsøe A/S | Ozone assisted mist control unit |
| US8025860B1 (en) | 2010-07-08 | 2011-09-27 | Air Products And Chemicals, Inc. | Removal of acid mists |
| WO2012171824A1 (en) | 2011-06-15 | 2012-12-20 | Haldor Topsøe A/S | High flow capacity condenser tube for sulphuric acid condensation |
| WO2014094838A1 (en) | 2012-12-19 | 2014-06-26 | Haldor Topsøe A/S | Combustor for sulfur containing material and method and plant for producing sulfuric acid |
| PL3077105T3 (pl) | 2013-12-02 | 2025-05-12 | Topsoe A/S | Sposób utleniania związków siarki |
| US11440798B2 (en) * | 2018-12-26 | 2022-09-13 | Keyon Process Co., Ltd | Process system and process method for conversion of sulfur-containing flue gas to sulfuric acid |
| US12599858B2 (en) | 2020-02-14 | 2026-04-14 | Topsoe A/S | Process for the removal of particulate matter from an aqueous stream |
| CA3250898A1 (en) * | 2022-05-06 | 2023-11-09 | Topsoe A/S | PROCESS FOR RECOVERING AND RECIRCULATING CONCENTRATED SULFURIC ACID |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA705824A (en) * | 1965-03-16 | Pauling Egon | Process for obtaining h2so4 from gases containing so2 | |
| GB1052188A (pl) * | 1900-01-01 | |||
| DK145457C (da) * | 1980-03-25 | 1983-04-18 | Haldor Topsoe As | Fremgangsmaade til fremstilling af svovlsyre,ved hvilken maengden af svovlsyretaage i afgangsgassen styres ved temperaturregulering |
| DK155723C (da) * | 1982-03-25 | 1989-10-09 | Haldor Topsoe As | Fremgangsmaade og apparat til fremstilling af svovlsyre |
| DK168702B1 (da) * | 1988-06-02 | 1994-05-24 | Topsoe Haldor As | Fremgangsmåde ved fremstilling af svovlsyre og apparat til anvendelse ved udøvelse af fremgangsmåden |
-
1988
- 1988-06-09 DK DK312588A patent/DK168701B1/da not_active IP Right Cessation
-
1989
- 1989-05-22 AT AT89907100T patent/ATE118201T1/de not_active IP Right Cessation
- 1989-05-22 AU AU38401/89A patent/AU625971B2/en not_active Expired
- 1989-05-22 WO PCT/DK1989/000133 patent/WO1989012025A1/en not_active Ceased
- 1989-05-22 JP JP1506964A patent/JP2823618B2/ja not_active Expired - Lifetime
- 1989-05-22 DE DE68921074T patent/DE68921074T2/de not_active Expired - Lifetime
- 1989-05-22 BR BR898907477A patent/BR8907477A/pt not_active IP Right Cessation
- 1989-05-22 US US07/623,409 patent/US5198206A/en not_active Expired - Lifetime
- 1989-05-22 HU HU893784A patent/HU207686B/hu unknown
- 1989-05-22 EP EP89907100A patent/EP0419539B1/en not_active Expired - Lifetime
- 1989-05-22 KR KR1019900700267A patent/KR970007426B1/ko not_active Expired - Fee Related
- 1989-05-23 IE IE167489A patent/IE66568B1/en not_active IP Right Cessation
- 1989-06-06 TR TR89/0474A patent/TR25214A/xx unknown
- 1989-06-06 CN CN89103840A patent/CN1022310C/zh not_active Expired - Lifetime
- 1989-06-07 DD DD89329354A patent/DD283980A5/de not_active IP Right Cessation
- 1989-06-08 PL PL89279853A patent/PL163855B1/pl unknown
- 1989-06-08 CA CA000602164A patent/CA1338815C/en not_active Expired - Lifetime
- 1989-06-09 CZ CS893518A patent/CZ284443B6/cs not_active IP Right Cessation
- 1989-06-09 SK SK3518-89A patent/SK279647B6/sk unknown
- 1989-06-09 ES ES8902022A patent/ES2013540A6/es not_active Expired - Lifetime
-
1990
- 1990-12-05 FI FI906010A patent/FI91518C/fi not_active IP Right Cessation
- 1990-12-07 NO NO905312A patent/NO302748B1/no not_active IP Right Cessation
- 1990-12-07 RU SU904894099A patent/RU1838232C/ru active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK1K | Patent expired |