ES2041806T3 - Una silice amorfa. - Google Patents
Una silice amorfa.Info
- Publication number
- ES2041806T3 ES2041806T3 ES198888308426T ES88308426T ES2041806T3 ES 2041806 T3 ES2041806 T3 ES 2041806T3 ES 198888308426 T ES198888308426 T ES 198888308426T ES 88308426 T ES88308426 T ES 88308426T ES 2041806 T3 ES2041806 T3 ES 2041806T3
- Authority
- ES
- Spain
- Prior art keywords
- reaction
- range
- silica
- mineral acid
- electrolyte
- 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 - Lifetime
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 6
- 238000006243 chemical reaction Methods 0.000 abstract 3
- 239000000377 silicon dioxide Substances 0.000 abstract 3
- 239000002253 acid Substances 0.000 abstract 2
- 239000003792 electrolyte Substances 0.000 abstract 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 2
- 239000011707 mineral Substances 0.000 abstract 2
- 238000001556 precipitation Methods 0.000 abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract 1
- 229920005439 Perspex® Polymers 0.000 abstract 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract 1
- 239000004115 Sodium Silicate Substances 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 1
- 238000005299 abrasion Methods 0.000 abstract 1
- 239000003082 abrasive agent Substances 0.000 abstract 1
- 230000002378 acidificating effect Effects 0.000 abstract 1
- 150000001450 anions Chemical class 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 abstract 1
- 150000001768 cations Chemical class 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 239000004926 polymethyl methacrylate Substances 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 239000011591 potassium Substances 0.000 abstract 1
- 229910052700 potassium Inorganic materials 0.000 abstract 1
- 239000000376 reactant Substances 0.000 abstract 1
- 239000012429 reaction media Substances 0.000 abstract 1
- 239000011734 sodium Substances 0.000 abstract 1
- 229910052708 sodium Inorganic materials 0.000 abstract 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052911 sodium silicate Inorganic materials 0.000 abstract 1
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 1
- 239000000606 toothpaste Substances 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
- C01B33/187—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates
- C01B33/193—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates of aqueous solutions of silicates
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/25—Silicon; Compounds thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q11/00—Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/41—Particular ingredients further characterized by their size
- A61K2800/412—Microsized, i.e. having sizes between 0.1 and 100 microns
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/02—Amorphous compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/14—Pore volume
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/16—Pore diameter
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/90—Other properties not specified above
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Veterinary Medicine (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Epidemiology (AREA)
- Birds (AREA)
- Silicon Compounds (AREA)
- Cosmetics (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Saccharide Compounds (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
SE PUEDEN PREPARAR SILICES AMORFAS ADECUADAS PARA USARLAS COMO ABRASIVOS EN PASTAS DE DIENTES TRANSPARENTES, POR UN METODO DE PRECIPITACION. ESTAS SILICES SE DISTINGUEN POR TENER UNA SUPERFICIE ESPECIFICA BET DE 420 A 550 M2/G, UN TAMAÑO DE PARTICULA MEDIO DE 5 A 20 MICRAS, UN INDICE DE ABRASION DE POLIACRILATO DE 15 A 28, UN DIAMETRO DE PORO MEDIO DE 3 A 8 MM Y UNA TRANSMISION DE AL MENOS EL 70% EN LA GAMA DE R1 DE 1.444 A 1.460.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB878721644A GB8721644D0 (en) | 1987-09-15 | 1987-09-15 | Silicas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES2041806T3 true ES2041806T3 (es) | 1993-12-01 |
Family
ID=10623782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES198888308426T Expired - Lifetime ES2041806T3 (es) | 1987-09-15 | 1988-09-13 | Una silice amorfa. |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US4992251A (es) |
| EP (1) | EP0308165B1 (es) |
| JP (1) | JPH01111710A (es) |
| AT (1) | ATE77352T1 (es) |
| AU (1) | AU612406B2 (es) |
| CA (1) | CA1307647C (es) |
| DE (1) | DE3872125T2 (es) |
| ES (1) | ES2041806T3 (es) |
| GB (1) | GB8721644D0 (es) |
| ZA (1) | ZA886845B (es) |
Families Citing this family (50)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8707526D0 (en) * | 1987-03-30 | 1987-05-07 | Unilever Plc | Amorphous silicas |
| US6143281A (en) * | 1987-03-31 | 2000-11-07 | Smithkline Beecham P.L.C. | Dentifrice compositions |
| FR2622439B1 (fr) * | 1987-11-04 | 1991-07-12 | Rhone Poulenc Chimie | Silice pour compositions dentifrices compatible notamment avec la chlorhexidine |
| US5370852A (en) * | 1989-09-25 | 1994-12-06 | Japan Insulation Co., Ltd. | Primary particles of amorphous silica composite material, secondary particles of amorphous silica composite material, shaped bodies thereof and processes for their preparation |
| US5225177A (en) * | 1990-01-19 | 1993-07-06 | J. M. Huber Corporation | Dentifrice abrasives and compositions |
| US5234673A (en) * | 1990-02-20 | 1993-08-10 | J. M. Huber Corporation | Low temperature-very high structure silica and methods |
| WO1991019780A1 (en) * | 1990-06-21 | 1991-12-26 | Ppg Industries, Inc. | Protein removal using precipitated silica |
| DE69127964T3 (de) * | 1990-08-06 | 2004-09-02 | Ineos Silicas Ltd. | Kieselsäuren |
| US5108734A (en) * | 1991-07-01 | 1992-04-28 | Colgate-Palmolive Company | Prophy mouthfeel dentifrice having low RDA value |
| KR960010781B1 (ko) * | 1991-10-02 | 1996-08-08 | 유니레버 엔브이 | 실리카 |
| IT1263807B (it) * | 1992-01-24 | 1996-09-03 | Mizusawa Industrial Chem | Granuli sferici di silice porosa oppure di silicato poroso, procedimento per la loro produzione e loro impiego |
| ES2092334T5 (es) * | 1992-10-28 | 2003-01-16 | Ineos Silicas Ltd | Silices. |
| DE4427137B4 (de) * | 1993-10-07 | 2007-08-23 | Degussa Gmbh | Fällungskieselsäure |
| US5571494A (en) * | 1995-01-20 | 1996-11-05 | J. M. Huber Corporation | Temperature-activated polysilicic acids |
| US5747003A (en) * | 1995-03-22 | 1998-05-05 | Ppg Industries, Inc. | Amorphous precipitated silica abrasive |
| US5676932A (en) † | 1995-05-02 | 1997-10-14 | J.M. Huber Corporation | Silica abrasive compositions |
| US5658553A (en) * | 1995-05-02 | 1997-08-19 | The Procter & Gamble Company | Dentifrice compositions |
| US5651958A (en) * | 1995-05-02 | 1997-07-29 | The Procter & Gamble Company | Dentifrice compositions |
| US5589160A (en) * | 1995-05-02 | 1996-12-31 | The Procter & Gamble Company | Dentifrice compositions |
| BR9609526A (pt) * | 1995-06-30 | 1999-02-23 | Crosfield Joseph & Sons | Sílica amorfa processo para sua preparação e composições oral e de pasta de dentes |
| US5891421A (en) * | 1996-03-22 | 1999-04-06 | J.M. Huber Corporation | Precipitated silicas having improved dentifrice performance characteristics and methods of preparation |
| FR2750692B1 (fr) * | 1996-07-05 | 1998-10-16 | Rhone Poulenc Chimie | Nouvelle silice abrasive, utilisable dans les dentifrices, son procede de preparation et compositions dentifrices la contenant |
| WO2003000217A2 (en) | 2001-06-25 | 2003-01-03 | The Procter & Gamble Company | Oral care compositions |
| US6616916B1 (en) * | 2001-12-10 | 2003-09-09 | J. M. Huber Corporation | Transparent dentifrices |
| US7008617B1 (en) | 2001-12-10 | 2006-03-07 | J.M. Huber Corporation | Precipitated silicas |
| US6869595B2 (en) * | 2001-12-21 | 2005-03-22 | J.M. Huber Corporation | Abrasive compositions for clear toothpaste |
| US20030131536A1 (en) * | 2001-12-21 | 2003-07-17 | Kostinko John A. | Precipitated silica |
| JP2004292190A (ja) * | 2003-03-25 | 2004-10-21 | Univ Shinshu | 二酸化ケイ素薄膜とその製造法 |
| US7306788B2 (en) * | 2004-11-24 | 2007-12-11 | J.M. Huber Corporation | High-cleaning/moderate abrasive silica materials and dentifrice containing such materials |
| US7267814B2 (en) * | 2004-11-24 | 2007-09-11 | J.M. Huber Corporation | High-cleaning/low abrasive silica and materials and dentifrice containing such materials |
| US7303742B2 (en) * | 2004-11-24 | 2007-12-04 | J.M. Huber Corporation | Viscosity-modifying silica materials that exhibit low cleaning and abrasive levels and dentifrices thereof |
| US7670593B2 (en) * | 2004-11-24 | 2010-03-02 | J.M. Huber Corporation | High-cleaning silica materials and dentifrice containing such |
| US20060110307A1 (en) * | 2004-11-24 | 2006-05-25 | Mcgill Patrick D | High-cleaning silica materials made via product morphology control and dentifrice containing such |
| GB0525369D0 (en) | 2005-12-14 | 2006-01-18 | Ineos Silicas Ltd | Silicas |
| US20070154413A1 (en) * | 2005-12-30 | 2007-07-05 | Nolan Lee Phillips | Dentifrices comprising biogenic silica materials |
| US20070154412A1 (en) * | 2005-12-30 | 2007-07-05 | Nolan Lee Phillips | Dentifrices comprising biogenic silica materials |
| US7270803B1 (en) | 2006-03-23 | 2007-09-18 | J.M. Huber Corporation | High-cleaning, low abrasion, high brightness silica materials for dentrifices |
| US20070224133A1 (en) * | 2006-03-23 | 2007-09-27 | Mcgill Patrick D | High-cleaning silica materials made via product morphology control under high shear conditions |
| FR2902781B1 (fr) * | 2006-06-27 | 2008-09-05 | Rhodia Recherches Et Technologies Sas | Silice precipitee pour application papier |
| US20080159968A1 (en) * | 2006-12-27 | 2008-07-03 | Fultz William C | Dentifrices comprising biogenic silica materials and calcium carbonate |
| US20080159967A1 (en) * | 2006-12-27 | 2008-07-03 | Fultz William C | Dentifrices comprising biogenic silica materials and at least one calcium phosphate |
| US20090297459A1 (en) * | 2008-06-03 | 2009-12-03 | Duen-Wu Hua | Transparent silica gel/precipitated silica composite materials for dentifrices |
| US8088277B2 (en) * | 2008-06-11 | 2012-01-03 | General Electric Company | Methods and system for removing impurities from heavy fuel |
| JP6029420B2 (ja) * | 2012-01-13 | 2016-11-24 | ホーユー株式会社 | 毛髪脱色・脱染剤組成物 |
| EP2895182B1 (en) | 2012-09-11 | 2019-05-01 | SLH Optimal Health LLC | Dental cleaning composition |
| US9957431B2 (en) * | 2013-11-11 | 2018-05-01 | Heraeus Quarzglas Gmbh & Co. Kg | Composite material, heat-absorbing component, and method for producing the composite material |
| DE102014113411A1 (de) | 2014-09-17 | 2016-03-17 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Anorganische, Silica-basierte Feststoff-Schaumpartikel mit geschlossenen Innenporen, ihre Herstellung und ihre Verwendung als Füll- oder Speicherstoff |
| JP2023553948A (ja) | 2020-12-11 | 2023-12-26 | ピーキュー シリカス ユーケー リミテッド | 研磨性シリカ粒子 |
| IL314498A (en) * | 2022-02-04 | 2024-09-01 | Sigrid Therapeutics Ab | A preparation for oral care that includes porous silica particles |
| GB202312179D0 (en) * | 2023-08-09 | 2023-09-20 | Sigrid Therapeutics Ab | New compositions and uses |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE343477C (sv) * | 1966-12-05 | 1977-09-26 | Unilever Nv | Tandkremskomposition innehallande en kiseldioxid |
| GB1264292A (es) * | 1969-03-28 | 1972-02-16 | ||
| FR2257658A1 (en) * | 1973-10-03 | 1975-08-08 | Sifrance | Polymsd synthetic silica pigments for toothpastes - prepd. by pptn. from a soln. contg. silicate, acid and electrolyte |
| US3977893A (en) * | 1973-10-03 | 1976-08-31 | J. M. Huber Corporation | Amorphous precipitated siliceous pigments and improved process for producing such pigments |
| US3960586A (en) * | 1973-10-03 | 1976-06-01 | J. M. Huber Corporation | Amorphous precipitated siliceous pigments and improved process for producing such pigments |
| GB1482354A (en) * | 1973-10-03 | 1977-08-10 | Huber Corp J M | Amorphous precipitated siliceous pigments and process for producing such pigments |
| DE2853647C3 (de) * | 1978-12-13 | 1988-04-14 | Grace Gmbh, 2000 Norderstedt | Verfahren zur Herstellung von Kieselsäuregelen sowie deren Verwendung |
| US4262171A (en) * | 1979-01-08 | 1981-04-14 | Catalyst Research Corporation | Telephone system in which communication between stations is controlled by computers at each individual station |
| US4294894A (en) * | 1979-01-15 | 1981-10-13 | E. R. Squibb & Sons, Inc. | Transparent toothpaste having a medicinal action and process for its production |
| JPS6039327B2 (ja) * | 1979-08-31 | 1985-09-05 | ライオン株式会社 | 歯磨組成物 |
| JPS60105609A (ja) * | 1983-03-04 | 1985-06-11 | Taki Chem Co Ltd | 歯磨用シリカ基剤及びその製造方法 |
| JPS59163306A (ja) * | 1983-03-08 | 1984-09-14 | Taki Chem Co Ltd | 歯磨用シリカ基剤及びその製法 |
| JPH0647452B2 (ja) * | 1985-08-27 | 1994-06-22 | 東ソー株式会社 | 液体クロマトグラフイ−用シリカゲルの製造方法 |
| GB8529796D0 (en) * | 1985-12-03 | 1986-01-08 | Unilever Plc | Precipitated silicas |
| GB8604985D0 (en) * | 1986-02-28 | 1986-04-09 | Unilever Plc | Precipitated silicas |
-
1987
- 1987-09-15 GB GB878721644A patent/GB8721644D0/en active Pending
-
1988
- 1988-09-07 CA CA000576695A patent/CA1307647C/en not_active Expired - Lifetime
- 1988-09-12 AU AU22137/88A patent/AU612406B2/en not_active Expired - Fee Related
- 1988-09-13 ES ES198888308426T patent/ES2041806T3/es not_active Expired - Lifetime
- 1988-09-13 AT AT88308426T patent/ATE77352T1/de not_active IP Right Cessation
- 1988-09-13 EP EP19880308426 patent/EP0308165B1/en not_active Expired - Lifetime
- 1988-09-13 DE DE8888308426T patent/DE3872125T2/de not_active Expired - Lifetime
- 1988-09-14 JP JP63231431A patent/JPH01111710A/ja active Granted
- 1988-09-14 ZA ZA886845A patent/ZA886845B/xx unknown
- 1988-09-15 US US07/244,898 patent/US4992251A/en not_active Expired - Lifetime
-
1990
- 1990-10-29 US US07/604,235 patent/US5035879A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| AU612406B2 (en) | 1991-07-11 |
| ATE77352T1 (de) | 1992-07-15 |
| DE3872125T2 (de) | 1992-12-03 |
| CA1307647C (en) | 1992-09-22 |
| EP0308165B1 (en) | 1992-06-17 |
| DE3872125D1 (de) | 1992-07-23 |
| EP0308165A2 (en) | 1989-03-22 |
| JPH01111710A (ja) | 1989-04-28 |
| EP0308165A3 (en) | 1989-05-03 |
| US4992251A (en) | 1991-02-12 |
| US5035879A (en) | 1991-07-30 |
| ZA886845B (en) | 1990-05-30 |
| JPH057327B2 (es) | 1993-01-28 |
| AU2213788A (en) | 1989-03-16 |
| GB8721644D0 (en) | 1987-10-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG2A | Definitive protection |
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