GB1569714A - Nickel-rhenium hydrogenation catalyst and methods of preparing same and using same - Google Patents
Nickel-rhenium hydrogenation catalyst and methods of preparing same and using same Download PDFInfo
- Publication number
- GB1569714A GB1569714A GB376/77A GB37677A GB1569714A GB 1569714 A GB1569714 A GB 1569714A GB 376/77 A GB376/77 A GB 376/77A GB 37677 A GB37677 A GB 37677A GB 1569714 A GB1569714 A GB 1569714A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nickel
- rhenium
- composition
- catalyst
- support
- 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
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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/889—Manganese, technetium or rhenium
- B01J23/8896—Rhenium
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/04—Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups
- C07C209/14—Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups by substitution of hydroxy groups or of etherified or esterified hydroxy groups
- C07C209/16—Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups by substitution of hydroxy groups or of etherified or esterified hydroxy groups with formation of amino groups bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/24—Preparation of compounds containing amino groups bound to a carbon skeleton by reductive alkylation of ammonia, amines or compounds having groups reducible to amino groups, with carbonyl compounds
- C07C209/28—Preparation of compounds containing amino groups bound to a carbon skeleton by reductive alkylation of ammonia, amines or compounds having groups reducible to amino groups, with carbonyl compounds by reduction with other reducing agents
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/647,065 US4123462A (en) | 1976-01-07 | 1976-01-07 | Amination process using nickel-rhenium catalysts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1569714A true GB1569714A (en) | 1980-06-18 |
Family
ID=24595557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB376/77A Expired GB1569714A (en) | 1976-01-07 | 1977-01-06 | Nickel-rhenium hydrogenation catalyst and methods of preparing same and using same |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US4123462A (enExample) |
| JP (2) | JPS6038380B2 (enExample) |
| BE (1) | BE850144A (enExample) |
| CA (1) | CA1083558A (enExample) |
| DE (1) | DE2700339C3 (enExample) |
| FR (1) | FR2337585A1 (enExample) |
| GB (1) | GB1569714A (enExample) |
| IN (1) | IN145670B (enExample) |
| IT (1) | IT1082703B (enExample) |
| NL (1) | NL180914C (enExample) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0526851A3 (en) * | 1991-07-31 | 1993-05-19 | Tosoh Corporation | Process and catalyst for producing an ethylenamine |
| WO1997012928A1 (en) * | 1995-10-04 | 1997-04-10 | The Dow Chemical Company | Amine capped polyethers and process for producing same |
| US5817593A (en) * | 1995-06-02 | 1998-10-06 | The Dow Chemical Company | Catalyst and process for producing amines |
| JP2012162525A (ja) * | 2011-02-03 | 2012-08-30 | Evonik Degussa Gmbh | ポリアミド合成のための主鎖が線状の第1級ジアミンの製造 |
Families Citing this family (78)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2411030A1 (fr) * | 1977-12-12 | 1979-07-06 | Azote & Prod Chim | Catalyseur et procede de fabrication d'amines a partir d'alcools |
| EP0002630B2 (fr) * | 1977-12-12 | 1986-04-16 | Societe Chimique De La Grande Paroisse, Azote Et Produits Chimiques | Catalyseur et procédé de fabrication d'amines à partir d'alcools |
| FR2430262A2 (fr) * | 1978-07-04 | 1980-02-01 | Azote & Prod Chim | Catalyseur et procede de fabrication d'amines a partir d'alcools |
| US4209424A (en) | 1977-12-12 | 1980-06-24 | Societe Chimique de la Grande Paroisse, Azote et Products Chimiques | Catalyst for manufacturing amines from alcohols |
| US4400539A (en) * | 1981-09-30 | 1983-08-23 | Union Carbide Corporation | Process for the manufacture of ethylenediamine |
| US4404405A (en) * | 1981-09-30 | 1983-09-13 | Union Carbide Corporation | Process for the preparation of polyethylene polyamines |
| US4929759A (en) * | 1983-07-27 | 1990-05-29 | Basf Aktiengesellschaft | Production of amines from an olefin and ammonia or a primary or secondary amine |
| SE461095B (sv) * | 1983-09-09 | 1990-01-08 | Berol Kemi Ab | Amineringsfoerfarande med anvaendning av en ruteniumdopad nickel och/eller kovoltkatalysator |
| US4625030A (en) * | 1984-05-23 | 1986-11-25 | Union Carbide Corporation | Potentiated nickel catalysts for amination |
| US4647701A (en) * | 1984-05-23 | 1987-03-03 | Union Carbide Corporation | Processes for producing diethylenetriamine from monoethanolamine |
| US4827037A (en) * | 1985-04-04 | 1989-05-02 | Union Carbide Corporation | Quality of catalytically prepared polyalkylene polyamines |
| US4772750A (en) * | 1985-06-14 | 1988-09-20 | The Dow Chemical Company | Method of producing amines |
| GB8519425D0 (en) * | 1985-08-01 | 1985-09-04 | Ici Plc | Amine production |
| US4709034A (en) * | 1986-02-14 | 1987-11-24 | Air Products And Chemicals, Inc. | Process for the synthesis of hydroxyalkyl amines and hydroxyalkyl piperazines |
| US4918233A (en) * | 1986-07-08 | 1990-04-17 | Air Products And Chemicals, Inc. | Production of ethylenediamine from monoethanolamine and ammonia |
| US4774336A (en) * | 1986-10-02 | 1988-09-27 | Texaco Inc. | Process for preparing N-substituted piperazines from ethylene glycol and amines |
| GB8707304D0 (en) * | 1987-03-26 | 1987-04-29 | Bp Chem Int Ltd | Chemical process |
| US4795733A (en) * | 1987-11-27 | 1989-01-03 | Gaf Corporation | Hydrogenation catalyst and process for its preparation |
| GB8819663D0 (en) * | 1988-08-18 | 1988-09-21 | Bp Chem Int Ltd | Chemical process |
| GB8918965D0 (en) * | 1989-08-19 | 1989-10-04 | Bp Chem Int Ltd | Chemical process |
| DE4006540A1 (de) * | 1990-03-02 | 1991-09-05 | Huels Chemische Werke Ag | Katalysatoren fuer die metathese von olefinen und funktionalisierten olefinen |
| US5600000A (en) * | 1993-12-22 | 1997-02-04 | Union Carbide Chemicals & Plastics Technology Corporation | Reductive amination processes for the selective production of amino-ethylethanolamine |
| CA2146903C (en) * | 1993-12-22 | 2000-01-25 | Stephen Wayne King | Reductive amination catalysts for the selective production of aminoethylethanolamine |
| EP0737514B1 (en) * | 1993-12-22 | 2001-06-13 | Union Carbide Chemicals & Plastics Technology Corporation | Reductive amination processes for the selective production of aminoethylethanolamine |
| US5475138A (en) * | 1994-07-07 | 1995-12-12 | Pharm-Eco Laboratories Incorporated | Method preparing amino acid-derived diaminopropanols |
| US6063963A (en) * | 1995-07-05 | 2000-05-16 | Pharm-Eco Laboratories, Inc. | Amino acid-derived diaminopropanols |
| US5679862A (en) * | 1996-03-25 | 1997-10-21 | Chemical Research & Licensing Company | Amination process |
| SE513250C2 (sv) * | 1997-11-11 | 2000-08-07 | Akzo Nobel Nv | Amineringsförfarande för framställning av polyaminer |
| AU5280999A (en) * | 1998-07-21 | 2000-02-14 | Lonza A.G. | Method for producing amines |
| US6534441B1 (en) | 1999-03-06 | 2003-03-18 | Union Carbide Chemicals & Plastics Technology Corporation | Nickel-rhenium catalyst for use in reductive amination processes |
| US6309758B1 (en) * | 1999-05-06 | 2001-10-30 | W. R. Grace & Co.-Conn. | Promoted porous catalyst |
| DE10145119A1 (de) * | 2001-09-13 | 2003-04-03 | Basf Ag | Verfahren zur Herstellung von Aminen |
| CA2476421A1 (en) * | 2002-03-08 | 2003-09-18 | Sensys Medical, Inc. | Compact apparatus for noninvasive measurement of glucose through near-infrared spectroscopy |
| US7022645B2 (en) * | 2003-08-04 | 2006-04-04 | Catalytic Distillation Technologies | Ni hydrogenation catalysts, manufacture and use |
| US7131446B2 (en) * | 2004-03-25 | 2006-11-07 | Tang Kenneth Y | Light-triggered tattoo process |
| US7619119B2 (en) * | 2006-06-07 | 2009-11-17 | The Procter & Gamble Company | Processes for converting glycerol to amino alcohols |
| ES2402216T3 (es) * | 2006-06-07 | 2013-04-29 | The Procter & Gamble Company | Procesos para convertir glicerol en aminoalcoholes |
| US7619118B2 (en) | 2006-06-07 | 2009-11-17 | The Procter & Gamble Company | Process for the conversion of glycerol to propylene glycol and amino alcohols |
| JP2011508753A (ja) * | 2008-01-03 | 2011-03-17 | アクゾ ノーベル ナムローゼ フェンノートシャップ | エチレンアミンを調製する方法 |
| WO2009155466A2 (en) | 2008-06-19 | 2009-12-23 | Honda Motor Co. Ltd. | Low temperature single-wall carbon nanotube synthesis |
| CN102227258B (zh) | 2008-10-06 | 2014-02-19 | 联合碳化化学品及塑料技术公司 | 包括酸性混合金属氧化物作为载体的低金属(镍和铼)催化剂组合物 |
| WO2010042159A1 (en) * | 2008-10-06 | 2010-04-15 | Union Carbide Chemicals & Plastics Technology Llc | Methods of making cyclic, n-amino functional triamines |
| US8188318B2 (en) * | 2008-10-06 | 2012-05-29 | Union Carbide Chemicals & Plastics Technology Llc | Method of manufacturing ethyleneamines |
| CN102171178B (zh) * | 2008-10-06 | 2015-07-29 | 联合碳化化学品及塑料技术公司 | 乙二胺和其它乙撑胺的连续氨基转移 |
| JP5612583B2 (ja) | 2008-10-06 | 2014-10-22 | ダウ グローバル テクノロジーズ エルエルシー | エチレンオキサイド及びアンモニアからのエタノールアミン及びエチレンアミンの製造方法並びに関連方法 |
| CN102171179B (zh) * | 2008-10-06 | 2014-04-30 | 联合碳化化学品及塑料技术公司 | 亲核化合物的烷氧基转移 |
| EP2352585B1 (en) | 2008-10-06 | 2020-06-17 | Union Carbide Corporation | Low metal loaded, alumina supported, catalyst compositions and amination process |
| CN101875014B (zh) * | 2009-11-17 | 2012-10-03 | 中国科学院大连化学物理研究所 | 一种在临氢条件下一乙醇胺和氨转化为乙二胺的催化剂 |
| US8735616B2 (en) | 2010-05-21 | 2014-05-27 | H R D Corporation | Process for upgrading low value renewable oils |
| DE102011004465A1 (de) | 2010-09-10 | 2012-03-15 | Evonik Degussa Gmbh | Verfahren zur direkten Aminierung sekundärer Alkohole mit Ammoniak zu primären Aminen |
| DE102011075162A1 (de) | 2010-12-08 | 2012-06-14 | Evonik Degussa Gmbh | Verfahren zur homogen-katalysierte, hochselektiven direkten Aminierung von primären Alkoholen mit Ammoniak zu primären Aminen bei hohem Volumenverhältnis von Flüssig- zu Gasphase und/oder hohen Drücken |
| JP5933599B2 (ja) | 2011-02-21 | 2016-06-15 | エボニック デグサ ゲーエムベーハーEvonik Degussa GmbH | キサントホス触媒系を用いた、第一級アミンを得るための、アンモニアによるアルコールの直接アミノ化法 |
| US9353044B2 (en) | 2011-12-22 | 2016-05-31 | Dow Global Technologies, Llc | Reductive amination of diethanolamine and resulting product mixture |
| US8952198B2 (en) | 2013-01-30 | 2015-02-10 | Ian Williams | Amination process for manufacturing amines using catalyst |
| EP3077444B1 (en) | 2013-12-02 | 2018-04-25 | Dow Global Technologies LLC | Preparation of high molecular weight, branched, acyclic polyalkyleneamines and mixtures thereof |
| KR101981157B1 (ko) | 2016-02-12 | 2019-05-22 | 아크조 노벨 케미칼즈 인터내셔널 비.브이. | 고급 에틸렌아민 및 에틸렌아민 유도체의 제조 방법 |
| BR112018014267B1 (pt) * | 2016-02-12 | 2021-12-28 | Akzo Nobel Chemicals International B.V. | Processo de preparação de etilenoaminas |
| US10428011B2 (en) | 2016-02-12 | 2019-10-01 | Nouryon Chemicals International B.V. | Process to prepare higher ethylene amines and ethylene amine derivatives |
| CA3023946C (en) | 2016-05-11 | 2024-02-13 | Reg Synthetic Fuels, Llc | Biorenewable kerosene, jet fuel, jet fuel blendstock, and method of manufacturing |
| BR112019008783A2 (pt) * | 2016-11-30 | 2019-07-16 | Basf Se | processo para a conversão de etano-1,2-diol em etano-1,2-diamina |
| US10836704B2 (en) | 2016-12-15 | 2020-11-17 | Basf Se | Method for producing ethanolamines and/or ethyleneamines |
| CN110709380A (zh) | 2017-06-09 | 2020-01-17 | 巴斯夫欧洲公司 | 制备亚乙基胺的方法 |
| BR112019025633B1 (pt) | 2017-06-09 | 2023-05-09 | Basf Se | Processo para a preparação de alcanolaminas e/ou etilenoaminas |
| WO2018224321A1 (de) | 2017-06-09 | 2018-12-13 | Basf Se | Verfahren zur herstellung von ethylenaminen |
| TWI762669B (zh) | 2017-07-10 | 2022-05-01 | 荷蘭商安科智諾貝爾化學國際公司 | 製造較高分子量伸乙基胺之方法 |
| EP3700883B1 (de) | 2017-10-27 | 2022-04-20 | Basf Se | Verfahren zur herstellung von ethylenaminen |
| BR112020006435B1 (pt) | 2017-10-27 | 2023-03-21 | Basf Se | Processo de preparação de etilenoaminas e/ou alcanolaminas |
| US11225455B2 (en) | 2017-10-27 | 2022-01-18 | Basf Se | Separation of n-methylethylenediamine from EDA-containing mixtures |
| BR112020006442B1 (pt) | 2017-10-27 | 2023-03-21 | Basf Se | Processo de purificação de etilenodiamina |
| CN107913694A (zh) * | 2017-10-31 | 2018-04-17 | 山东玉皇化工有限公司 | 一种胺化催化剂载体的调变方法及其应用 |
| CN109734601B (zh) * | 2019-01-25 | 2021-11-12 | 浙江师范大学 | 一种制备1,3-丙二胺的方法 |
| WO2020178085A1 (en) | 2019-03-06 | 2020-09-10 | Basf Se | Method for the production of ethyleneamines |
| US12398090B2 (en) | 2019-12-13 | 2025-08-26 | Basf Se | Separation of n-methylethylenediamine from EDA-containing mixtures |
| WO2023135035A1 (en) | 2022-01-14 | 2023-07-20 | Basf Se | Method for the manufacture or conversion of alkanolamines |
| CN119486997A (zh) | 2022-06-29 | 2025-02-18 | 巴斯夫欧洲公司 | 用于制造亚乙基胺的方法 |
| WO2024002748A1 (en) | 2022-06-29 | 2024-01-04 | Basf Se | Method for manufacture of ethyleneamines |
| WO2025125094A1 (en) | 2023-12-14 | 2025-06-19 | Basf Se | Process for preparing diethylenetriamine and/or ethylene glycol |
| CN118253311A (zh) * | 2024-04-08 | 2024-06-28 | 卫星化学股份有限公司 | 一种用于乙二胺和哌嗪制备的催化剂及其制备方法和应用 |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3240782A (en) * | 1966-03-15 | Method of converting z-dehydro-isoeme tine into z-dehydro-emetine and inter- mediates therein | ||
| DE1034184B (de) * | 1957-01-23 | 1958-07-17 | Basf Ag | Verfahren zur Herstellung von 1, 3-Propylendiamin |
| US3022349A (en) * | 1957-12-30 | 1962-02-20 | Union Carbide Corp | Production of amines |
| NL248643A (enExample) * | 1959-02-27 | |||
| DE1172268B (de) * | 1962-02-21 | 1964-06-18 | Basf Ag | Verfahren zur Herstellung von Diaminen |
| FR1360740A (fr) * | 1963-02-12 | 1964-05-15 | British Petroleum Co | Perfectionnements relatifs à l'hydrogénation des paraffines |
| FR1368177A (fr) * | 1963-06-07 | 1964-07-31 | Comp Generale Electricite | Procédé de préparation d'un catalyseur d'hydrogénation, catalyseur ainsi obtenu et applications |
| US3387032A (en) * | 1965-06-08 | 1968-06-04 | Jackson D. Leonard | Process for the manufacture of methylamines |
| US3492314A (en) * | 1965-08-23 | 1970-01-27 | Mitsubishi Petrochemical Co | Process for catalytic hydrogenation of dicarboxylic acid anhydride and catalyst therefor |
| US3520933A (en) * | 1966-10-28 | 1970-07-21 | Basf Ag | Production of amines |
| US3666412A (en) * | 1968-10-21 | 1972-05-30 | Du Pont | Dispersed phase activated and stabilized metal catalysts |
| US3708539A (en) * | 1970-02-06 | 1973-01-02 | Union Oil Co | Condensation of ammonia or a primary or secondary amine with an alcohol |
| BE765482A (fr) * | 1970-04-20 | 1971-08-30 | Du Pont | Catalyseur de reforming modifie au rhenium |
| JPS4734181U (enExample) * | 1971-05-07 | 1972-12-16 | ||
| US3739029A (en) * | 1971-12-29 | 1973-06-12 | Shell Oil Co | N-alkyl amine production |
| FR2252330B1 (enExample) * | 1973-11-23 | 1978-06-16 | Ruhrchemie Ag | |
| US4036883A (en) * | 1974-11-27 | 1977-07-19 | Basf Aktiengesellschaft | Manufacture of isomer-free 3-methylbutylamine |
-
1976
- 1976-01-07 US US05/647,065 patent/US4123462A/en not_active Expired - Lifetime
- 1976-10-06 US US05/730,291 patent/US4111840A/en not_active Expired - Lifetime
- 1976-12-22 CA CA268,485A patent/CA1083558A/en not_active Expired
-
1977
- 1977-01-05 IT IT67020/77A patent/IT1082703B/it active
- 1977-01-05 DE DE2700339A patent/DE2700339C3/de not_active Expired
- 1977-01-06 FR FR7700256A patent/FR2337585A1/fr active Granted
- 1977-01-06 JP JP52000249A patent/JPS6038380B2/ja not_active Expired
- 1977-01-06 GB GB376/77A patent/GB1569714A/en not_active Expired
- 1977-01-06 BE BE173885A patent/BE850144A/xx not_active IP Right Cessation
- 1977-01-06 NL NLAANVRAGE7700084,A patent/NL180914C/xx not_active IP Right Cessation
- 1977-01-06 IN IN13/CAL/77A patent/IN145670B/en unknown
-
1980
- 1980-12-12 JP JP17480380A patent/JPS56108534A/ja active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0526851A3 (en) * | 1991-07-31 | 1993-05-19 | Tosoh Corporation | Process and catalyst for producing an ethylenamine |
| US5321160A (en) * | 1991-07-31 | 1994-06-14 | Tosoh Corporation | Process for producing an ethylenamine |
| US5817593A (en) * | 1995-06-02 | 1998-10-06 | The Dow Chemical Company | Catalyst and process for producing amines |
| US5952529A (en) * | 1995-06-02 | 1999-09-14 | The Dow Chemical Company | Catalyst and process for producing amines |
| WO1997012928A1 (en) * | 1995-10-04 | 1997-04-10 | The Dow Chemical Company | Amine capped polyethers and process for producing same |
| US5789490A (en) * | 1995-10-04 | 1998-08-04 | The Dow Chemical Company | Amine capped polyethers and process for producing same |
| JP2012162525A (ja) * | 2011-02-03 | 2012-08-30 | Evonik Degussa Gmbh | ポリアミド合成のための主鎖が線状の第1級ジアミンの製造 |
Also Published As
| Publication number | Publication date |
|---|---|
| BE850144A (fr) | 1977-07-06 |
| CA1083558A (en) | 1980-08-12 |
| NL7700084A (nl) | 1977-07-11 |
| US4123462A (en) | 1978-10-31 |
| JPS6038380B2 (ja) | 1985-08-31 |
| FR2337585B1 (enExample) | 1983-10-07 |
| IN145670B (enExample) | 1978-11-25 |
| JPS5285991A (en) | 1977-07-16 |
| NL180914C (nl) | 1987-05-18 |
| DE2700339C3 (de) | 1980-06-19 |
| DE2700339A1 (de) | 1977-08-18 |
| US4111840A (en) | 1978-09-05 |
| FR2337585A1 (fr) | 1977-08-05 |
| JPS56108534A (en) | 1981-08-28 |
| JPS6241064B2 (enExample) | 1987-09-01 |
| IT1082703B (it) | 1985-05-21 |
| DE2700339B2 (enExample) | 1979-08-09 |
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| Date | Code | Title | Description |
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| PS | Patent sealed [section 19, patents act 1949] | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19970105 |