GB1424284A - Catalyst for producing oxirane compounds by epoxidizing olefins with hydroperoxides - Google Patents
Catalyst for producing oxirane compounds by epoxidizing olefins with hydroperoxidesInfo
- Publication number
- GB1424284A GB1424284A GB1145673A GB1145673A GB1424284A GB 1424284 A GB1424284 A GB 1424284A GB 1145673 A GB1145673 A GB 1145673A GB 1145673 A GB1145673 A GB 1145673A GB 1424284 A GB1424284 A GB 1424284A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hydroperoxide
- reaction
- hydroperoxides
- march
- carbon atoms
- 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
- 150000001336 alkenes Chemical class 0.000 title abstract 3
- 150000002432 hydroperoxides Chemical class 0.000 title abstract 2
- 150000002924 oxiranes Chemical class 0.000 title abstract 2
- 239000003054 catalyst Substances 0.000 title 1
- 125000004432 carbon atom Chemical group C* 0.000 abstract 3
- GQNOPVSQPBUJKQ-UHFFFAOYSA-N 1-hydroperoxyethylbenzene Chemical compound OOC(C)C1=CC=CC=C1 GQNOPVSQPBUJKQ-UHFFFAOYSA-N 0.000 abstract 2
- XXROGKLTLUQVRX-UHFFFAOYSA-N allyl alcohol Chemical compound OCC=C XXROGKLTLUQVRX-UHFFFAOYSA-N 0.000 abstract 2
- 150000001875 compounds Chemical class 0.000 abstract 2
- LVBXEMGDVWVTGY-VOTSOKGWSA-N (E)-oct-2-enal Chemical compound CCCCC\C=C\C=O LVBXEMGDVWVTGY-VOTSOKGWSA-N 0.000 abstract 1
- XRXANEMIFVRKLN-UHFFFAOYSA-N 2-hydroperoxy-2-methylbutane Chemical compound CCC(C)(C)OO XRXANEMIFVRKLN-UHFFFAOYSA-N 0.000 abstract 1
- -1 2-phenylpropyl Chemical group 0.000 abstract 1
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical compound COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 abstract 1
- OSDWBNJEKMUWAV-UHFFFAOYSA-N Allyl chloride Chemical compound ClCC=C OSDWBNJEKMUWAV-UHFFFAOYSA-N 0.000 abstract 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 abstract 1
- 125000000217 alkyl group Chemical group 0.000 abstract 1
- 125000003118 aryl group Chemical group 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 125000005843 halogen group Chemical group 0.000 abstract 1
- 125000001867 hydroperoxy group Chemical group [*]OO[H] 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract 1
- 150000002927 oxygen compounds Chemical class 0.000 abstract 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 abstract 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 239000011949 solid catalyst Substances 0.000 abstract 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical group CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 abstract 1
Classifications
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- 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
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/617—500-1000 m2/g
-
- 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
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
-
- 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
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
-
- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/0234—Nitrogen-, phosphorus-, arsenic- or antimony-containing compounds
- B01J31/0235—Nitrogen containing compounds
- B01J31/0254—Nitrogen containing compounds on mineral substrates
-
- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/0272—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing elements other than those covered by B01J31/0201 - B01J31/0255
- B01J31/0274—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing elements other than those covered by B01J31/0201 - B01J31/0255 containing silicon
-
- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
-
- 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
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/613—10-100 m2/g
-
- 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
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/615—100-500 m2/g
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0203—Impregnation the impregnation liquid containing organic compounds
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/086—Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/12—Oxidising
- B01J37/14—Oxidising with gases containing free oxygen
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/02—Synthesis of the oxirane ring
- C07D301/03—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds
- C07D301/19—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds with organic hydroperoxides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/04—Compounds containing oxirane rings containing only hydrogen and carbon atoms in addition to the ring oxygen atoms
-
- 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
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/30—After treatment, characterised by the means used
- B01J2229/32—Reaction with silicon compounds, e.g. TEOS, siliconfluoride
-
- 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
- B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
- B01J2231/70—Oxidation reactions, e.g. epoxidation, (di)hydroxylation, dehydrogenation and analogues
- B01J2231/72—Epoxidation
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
- Epoxy Compounds (AREA)
- Catalysts (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00234301A US3829392A (en) | 1970-10-01 | 1972-03-13 | Heterogeneous catalysts for olefin epoxidation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1424284A true GB1424284A (en) | 1976-02-11 |
Family
ID=22880798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1145673A Expired GB1424284A (en) | 1972-03-13 | 1973-03-09 | Catalyst for producing oxirane compounds by epoxidizing olefins with hydroperoxides |
Country Status (17)
| Country | Link |
|---|---|
| JP (1) | JPS5635941B2 (es) |
| AR (1) | AR196234A1 (es) |
| BE (1) | BE796437R (es) |
| BR (1) | BR7301701D0 (es) |
| CA (1) | CA1015761A (es) |
| CH (1) | CH582021A5 (es) |
| DE (1) | DE2311822C2 (es) |
| DK (1) | DK150593C (es) |
| ES (2) | ES412496A2 (es) |
| FR (1) | FR2175844B2 (es) |
| GB (1) | GB1424284A (es) |
| IE (1) | IE37389B1 (es) |
| IT (1) | IT1053715B (es) |
| NL (1) | NL168835C (es) |
| NO (1) | NO143520C (es) |
| SE (2) | SE409034B (es) |
| ZA (1) | ZA731655B (es) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006087522A2 (en) * | 2005-02-17 | 2006-08-24 | Bp Exploration Operating Company Limited | Silyl-modified catalyst and use of this catalyst for the conversion of synthesis gas to hydrocarbons |
| WO2009034046A1 (en) * | 2007-09-10 | 2009-03-19 | Shell Internationale Research Maatschappij B.V. | Process for stabilising a fischer tropsch catalyst |
| CN113636991A (zh) * | 2021-08-13 | 2021-11-12 | 中国天辰工程有限公司 | 一种环氧环己烷的合成方法 |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5253678A (en) * | 1975-10-29 | 1977-04-30 | Hitachi Ltd | Semiconductor integrated circuit and productin of the same |
| JPS63120437A (ja) * | 1986-11-10 | 1988-05-24 | Agency Of Ind Science & Technol | 半導体集積回路構造 |
| DE3734138A1 (de) * | 1987-10-09 | 1989-04-20 | Scharmer Klaus Dr Ing | Saurer katalysator und verfahren zum herstellen des katalysators |
| DE19545042A1 (de) * | 1995-12-02 | 1997-06-05 | Studiengesellschaft Kohle Mbh | Amorphe mikroporöse Mischoxidkatalysatoren mit kontrollierter Oberflächenpolarität für die selektive heterogene Katalyse Adsorption und Stofftrennung |
| JP2007031449A (ja) * | 2006-10-19 | 2007-02-08 | Repsol Quimica Sa | 溶媒の存在下での過酸化水素によるオレフィン性化合物のエポキシ化方法 |
| TWI628146B (zh) * | 2016-11-28 | 2018-07-01 | 東聯化學股份有限公司 | Preparation method and application of titanium-containing cerium oxide material with high thermal stability |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3391213A (en) * | 1967-06-12 | 1968-07-02 | Shell Oil Co | Isoprene production from isopentane via hydroperoxide and borate ester |
| JPS5440526A (en) * | 1977-09-07 | 1979-03-30 | Toshiba Corp | Integrated drawing processor |
-
1973
- 1973-02-13 CA CA163,568A patent/CA1015761A/en not_active Expired
- 1973-03-08 BE BE1004871A patent/BE796437R/xx active
- 1973-03-09 NO NO953/73A patent/NO143520C/no unknown
- 1973-03-09 SE SE7303377A patent/SE409034B/xx unknown
- 1973-03-09 DE DE2311822A patent/DE2311822C2/de not_active Expired
- 1973-03-09 FR FR7308484A patent/FR2175844B2/fr not_active Expired
- 1973-03-09 IT IT21417/73A patent/IT1053715B/it active
- 1973-03-09 JP JP2721573A patent/JPS5635941B2/ja not_active Expired
- 1973-03-09 BR BR731701A patent/BR7301701D0/pt unknown
- 1973-03-09 ES ES412496A patent/ES412496A2/es not_active Expired
- 1973-03-09 ZA ZA731655A patent/ZA731655B/xx unknown
- 1973-03-09 IE IE388/73A patent/IE37389B1/xx unknown
- 1973-03-09 AR AR246987A patent/AR196234A1/es active
- 1973-03-09 DK DK131673A patent/DK150593C/da not_active IP Right Cessation
- 1973-03-09 CH CH352473A patent/CH582021A5/xx not_active IP Right Cessation
- 1973-03-09 GB GB1145673A patent/GB1424284A/en not_active Expired
- 1973-03-12 NL NLAANVRAGE7303415,A patent/NL168835C/xx active
-
1974
- 1974-02-09 ES ES423071A patent/ES423071A1/es not_active Expired
-
1976
- 1976-02-25 SE SE7602414A patent/SE415146B/xx not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006087522A2 (en) * | 2005-02-17 | 2006-08-24 | Bp Exploration Operating Company Limited | Silyl-modified catalyst and use of this catalyst for the conversion of synthesis gas to hydrocarbons |
| WO2006087522A3 (en) * | 2005-02-17 | 2006-12-21 | Bp Exploration Operating | Silyl-modified catalyst and use of this catalyst for the conversion of synthesis gas to hydrocarbons |
| US7666917B2 (en) | 2005-02-17 | 2010-02-23 | Bp Exploration Operating Company Limited | Modified catalyst and use of this catalyst for the conversion of synthesis gas to hydrocarbons |
| WO2009034046A1 (en) * | 2007-09-10 | 2009-03-19 | Shell Internationale Research Maatschappij B.V. | Process for stabilising a fischer tropsch catalyst |
| CN113636991A (zh) * | 2021-08-13 | 2021-11-12 | 中国天辰工程有限公司 | 一种环氧环己烷的合成方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| IE37389L (en) | 1973-09-13 |
| BE796437R (nl) | 1973-09-10 |
| DK150593C (da) | 1987-11-23 |
| JPS492795A (es) | 1974-01-11 |
| SE409034B (sv) | 1979-07-23 |
| IE37389B1 (en) | 1977-07-06 |
| SE7602414L (sv) | 1976-02-25 |
| DK150593B (da) | 1987-04-06 |
| NL7303415A (es) | 1973-09-17 |
| AR196234A1 (es) | 1973-12-10 |
| CA1015761A (en) | 1977-08-16 |
| NL168835B (nl) | 1981-12-16 |
| DE2311822A1 (de) | 1973-09-27 |
| ES423071A1 (es) | 1976-06-16 |
| FR2175844B2 (es) | 1976-09-10 |
| NO143520C (no) | 1981-03-04 |
| FR2175844A2 (es) | 1973-10-26 |
| AU5316473A (en) | 1974-09-12 |
| NL168835C (nl) | 1982-05-17 |
| ES412496A2 (es) | 1976-03-01 |
| NO143520B (no) | 1980-11-24 |
| BR7301701D0 (pt) | 1974-07-11 |
| CH582021A5 (es) | 1976-11-30 |
| DE2311822C2 (de) | 1982-11-04 |
| ZA731655B (en) | 1974-01-30 |
| JPS5635941B2 (es) | 1981-08-20 |
| SE415146B (sv) | 1980-09-15 |
| IT1053715B (it) | 1981-10-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] |