GB1382984A - Treatment of gases - Google Patents
Treatment of gasesInfo
- Publication number
- GB1382984A GB1382984A GB1003471A GB1003471A GB1382984A GB 1382984 A GB1382984 A GB 1382984A GB 1003471 A GB1003471 A GB 1003471A GB 1003471 A GB1003471 A GB 1003471A GB 1382984 A GB1382984 A GB 1382984A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gases
- catalyst
- oxide
- cobalt
- fibre
- 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
- 239000007789 gas Substances 0.000 title abstract 11
- 239000003054 catalyst Substances 0.000 abstract 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract 4
- 239000000835 fiber Substances 0.000 abstract 4
- 229910052751 metal Inorganic materials 0.000 abstract 4
- 239000002184 metal Substances 0.000 abstract 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 3
- 230000003197 catalytic effect Effects 0.000 abstract 3
- 239000003795 chemical substances by application Substances 0.000 abstract 3
- 229910017052 cobalt Inorganic materials 0.000 abstract 3
- 239000010941 cobalt Substances 0.000 abstract 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract 3
- 230000003647 oxidation Effects 0.000 abstract 3
- 238000007254 oxidation reaction Methods 0.000 abstract 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 abstract 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract 2
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 229910052741 iridium Inorganic materials 0.000 abstract 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 abstract 2
- 150000002739 metals Chemical class 0.000 abstract 2
- 229910052759 nickel Inorganic materials 0.000 abstract 2
- 229920000620 organic polymer Polymers 0.000 abstract 2
- 230000001590 oxidative effect Effects 0.000 abstract 2
- 230000000737 periodic effect Effects 0.000 abstract 2
- 229910052703 rhodium Inorganic materials 0.000 abstract 2
- 239000010948 rhodium Substances 0.000 abstract 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 abstract 2
- 229910052707 ruthenium Inorganic materials 0.000 abstract 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract 1
- 239000005864 Sulphur Substances 0.000 abstract 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- 239000000654 additive Substances 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 239000007864 aqueous solution Substances 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 239000010953 base metal Substances 0.000 abstract 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract 1
- 239000000292 calcium oxide Substances 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 1
- 159000000007 calcium salts Chemical class 0.000 abstract 1
- 229910000428 cobalt oxide Inorganic materials 0.000 abstract 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 abstract 1
- 239000008119 colloidal silica Substances 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 239000000446 fuel Substances 0.000 abstract 1
- 239000003966 growth inhibitor Substances 0.000 abstract 1
- 229930195733 hydrocarbon Natural products 0.000 abstract 1
- 150000002430 hydrocarbons Chemical class 0.000 abstract 1
- 229910052809 inorganic oxide Inorganic materials 0.000 abstract 1
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract 1
- 229920002689 polyvinyl acetate Polymers 0.000 abstract 1
- 239000011118 polyvinyl acetate Substances 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 239000003381 stabilizer Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 1
- 229910052721 tungsten Inorganic materials 0.000 abstract 1
- 239000010937 tungsten Substances 0.000 abstract 1
- 229910052727 yttrium Inorganic materials 0.000 abstract 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical class [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 abstract 1
- 150000003754 zirconium Chemical class 0.000 abstract 1
- 229910052726 zirconium Inorganic materials 0.000 abstract 1
Classifications
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/58—Fabrics or filaments
-
- 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
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
-
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
-
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
-
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20738—Iron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20746—Cobalt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20753—Nickel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/92—Dimensions
- B01D2255/9202—Linear dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/92—Dimensions
- B01D2255/9207—Specific surface
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1382984 Treating exhaust gas IMPERIAL CHEMICAL INDUSTRIES Ltd 12 April 1972 [20 April 1971] 10034/71 Heading F1B A method for reducing the quantity of carbon monoxide, hydrocarbons or nitrogen oxides in gases which comprises contacting the said gases under substantially non-oxidizing conditions i.e. the oxygen content of the gases is less than the equivalent of the oxidizable materials present in the gases with a fibrous catalyst comprising a synthetic refractory fibre and a catalytic agent which promotes one or more reactions by which at least one of the said components is wholly or partly destroyed. The fibrous catalyst is prepared by fibrizing an aqueous solution of alumina and/or zirconium and a water-soluble organic polymer, preferably partially hydrolyzed polyvinyl acetate, drying the fibre and heatingto decompose the organic polymer and the aluminium or zirconium salt to form a fibre comprising the oxides of the metals. The fibres may include additives such as:- grain growth inhibitors e.g. magnesium or calcium salts; phase change stabilizers, e.g. salts of yttrium or the rare earths, calcium oxide or zirconia; reinforcing particles e.g. colloidal silica; or compounds which improve the refractory qualities of the fibres e.g. acid oxides. The average diameter of the fibres is less than 20 microns e.g. 0À5 to 5 microns. Their thermal conductivity is less than 0À02 e.g. 0À0001 to 0À01 calories per second per degree C per centimetre cube. Their surface area is greater than 0À5 sq. m/gm. preferably 5 to 150 sq. m/gm. The catalytic agents include Group VIII metals of the Periodic Table, especially ruthenium, iridium, rhodium, nickel or cobalt, singly or in mixtures, and may be present as elementary metal in finely-divided form or as an oxide. When the fuel producing the gases contains a considerable quantity of sulphur (200 to 1,000 ppm, w/w) a first stage of the catalyst is preferably cobalt, suitably cobalt oxide. The gases contact the catalyst at a temperature of at least 400C, preferably 600C to 1000C. When an engine which produces the gases is being started-up, oxidizing air is initially added to the gases until the fibrous catalyst reaches its working temperature. A second stage of the catalyst comprises an oxidation stage and/or further reaction over a carbon monoxide shift or methanation catalyst. The synthetic refractory fibre is an inorganic oxide of alumina, zirconia, titania or silica. The proportion of catalytic agent in the fibrous catalyst is 0À001 to 1À0 wt. per cent in the case of ruthenium, iridium or rhodium and 1À0 to 10À0 wt. per cent in the case of nickel or cobalt. The oxidation stage is carried out using a platinum group metal in a concentration of 0À002 to 1À0% on a refractory support. Alternatively the oxidation catalyst is an oxide of one or more base metals from Group VIII of the periodic table or an oxide of chromium or tungsten. Some of the exhaust gas may be recycled to the engine inlet.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1003471A GB1382984A (en) | 1971-04-20 | 1971-04-20 | Treatment of gases |
| IT23368/72A IT959599B (en) | 1971-04-20 | 1972-04-19 | METHOD FOR THE TREATMENT OF GAS AND RELATED EQUIPMENT |
| SE7205129A SE377825B (en) | 1971-04-20 | 1972-04-19 | |
| FR7213833A FR2136529A5 (en) | 1971-04-20 | 1972-04-19 | |
| ZA722672A ZA722672B (en) | 1971-04-20 | 1972-04-20 | Treatment of gases |
| NL7205319A NL7205319A (en) | 1971-04-20 | 1972-04-20 | |
| DE19722219425 DE2219425A1 (en) | 1971-04-20 | 1972-04-20 | Process for reducing the amount of undesirable constituents in gases |
| BE782422A BE782422A (en) | 1971-04-20 | 1972-04-20 | GAS TREATMENT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1003471A GB1382984A (en) | 1971-04-20 | 1971-04-20 | Treatment of gases |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1382984A true GB1382984A (en) | 1975-02-05 |
Family
ID=9960245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1003471A Expired GB1382984A (en) | 1971-04-20 | 1971-04-20 | Treatment of gases |
Country Status (8)
| Country | Link |
|---|---|
| BE (1) | BE782422A (en) |
| DE (1) | DE2219425A1 (en) |
| FR (1) | FR2136529A5 (en) |
| GB (1) | GB1382984A (en) |
| IT (1) | IT959599B (en) |
| NL (1) | NL7205319A (en) |
| SE (1) | SE377825B (en) |
| ZA (1) | ZA722672B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2000046A (en) * | 1977-07-01 | 1979-01-04 | Johnson Matthey Co Ltd | Catalytic Conversion of Exhaust Gas |
| WO2005021137A1 (en) * | 2003-09-03 | 2005-03-10 | Hte Aktiengeselschaft | Catalyst for removing pollutants from exhaust gases from lean-burn engines, with ruthenium as active metal |
| EP1874440A2 (en) * | 2005-03-03 | 2008-01-09 | ConocoPhillips Company | Mercury removal sorbent |
| US11766662B2 (en) | 2020-09-21 | 2023-09-26 | Unifrax I Llc | Homogeneous catalytic fiber coatings and methods of preparing same |
| US11987914B2 (en) | 2018-04-04 | 2024-05-21 | Unifrax I Llc | Activated porous fibers and products including same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2424061A1 (en) * | 1978-04-25 | 1979-11-23 | Lyon Applic Catalytiques | NEW CONTACT MASS FOR HETEROGENOUS CATALYSIS |
| WO1980002566A1 (en) * | 1979-05-16 | 1980-11-27 | L Roos | A process for bonding agglomerates |
-
1971
- 1971-04-20 GB GB1003471A patent/GB1382984A/en not_active Expired
-
1972
- 1972-04-19 FR FR7213833A patent/FR2136529A5/fr not_active Expired
- 1972-04-19 SE SE7205129A patent/SE377825B/xx unknown
- 1972-04-19 IT IT23368/72A patent/IT959599B/en active
- 1972-04-20 ZA ZA722672A patent/ZA722672B/en unknown
- 1972-04-20 NL NL7205319A patent/NL7205319A/xx unknown
- 1972-04-20 BE BE782422A patent/BE782422A/en unknown
- 1972-04-20 DE DE19722219425 patent/DE2219425A1/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2000046A (en) * | 1977-07-01 | 1979-01-04 | Johnson Matthey Co Ltd | Catalytic Conversion of Exhaust Gas |
| GB2000046B (en) * | 1977-07-01 | 1982-03-24 | Johnson Matthey Co Ltd | Improved catalyst |
| WO2005021137A1 (en) * | 2003-09-03 | 2005-03-10 | Hte Aktiengeselschaft | Catalyst for removing pollutants from exhaust gases from lean-burn engines, with ruthenium as active metal |
| EP1874440A2 (en) * | 2005-03-03 | 2008-01-09 | ConocoPhillips Company | Mercury removal sorbent |
| EP1874440A4 (en) * | 2005-03-03 | 2008-12-31 | Conocophillips Co | Mercury removal sorbent |
| US11987914B2 (en) | 2018-04-04 | 2024-05-21 | Unifrax I Llc | Activated porous fibers and products including same |
| US11766662B2 (en) | 2020-09-21 | 2023-09-26 | Unifrax I Llc | Homogeneous catalytic fiber coatings and methods of preparing same |
Also Published As
| Publication number | Publication date |
|---|---|
| IT959599B (en) | 1973-11-10 |
| NL7205319A (en) | 1972-10-24 |
| SE377825B (en) | 1975-07-28 |
| BE782422A (en) | 1972-10-20 |
| ZA722672B (en) | 1973-12-19 |
| FR2136529A5 (en) | 1972-12-22 |
| DE2219425A1 (en) | 1972-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |