CA1201279A - Ceramic composite materials with high mechanical and heat resistance and their preparation - Google Patents
Ceramic composite materials with high mechanical and heat resistance and their preparationInfo
- Publication number
- CA1201279A CA1201279A CA000413416A CA413416A CA1201279A CA 1201279 A CA1201279 A CA 1201279A CA 000413416 A CA000413416 A CA 000413416A CA 413416 A CA413416 A CA 413416A CA 1201279 A CA1201279 A CA 1201279A
- Authority
- CA
- Canada
- Prior art keywords
- ceramic
- fibres
- matrix
- silica
- precursor
- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B30/00—Compositions for artificial stone, not containing binders
- C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/053—Fine ceramics
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/12—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on chromium oxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62625—Wet mixtures
- C04B35/6263—Wet mixtures characterised by their solids loadings, i.e. the percentage of solids
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/6303—Inorganic additives
- C04B35/6316—Binders based on silicon compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63432—Polystyrenes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63472—Condensation polymers of aldehydes or ketones
- C04B35/63476—Phenol-formaldehyde condensation polymers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
- C04B2235/522—Oxidic
- C04B2235/5224—Alumina or aluminates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
- C04B2235/522—Oxidic
- C04B2235/5232—Silica or silicates other than aluminosilicates, e.g. quartz
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
- C04B2235/524—Non-oxidic, e.g. borides, carbides, silicides or nitrides
- C04B2235/5244—Silicon carbide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5454—Particle size related information expressed by the size of the particles or aggregates thereof nanometer sized, i.e. below 100 nm
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/608—Green bodies or pre-forms with well-defined density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/616—Liquid infiltration of green bodies or pre-forms
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Reinforced Plastic Materials (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8119692A FR2514752A1 (fr) | 1981-10-20 | 1981-10-20 | Materiaux composites ceramises a resistance mecanique et thermique elevee et leur preparation |
| FR8119692 | 1981-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1201279A true CA1201279A (en) | 1986-03-04 |
Family
ID=9263209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000413416A Expired CA1201279A (en) | 1981-10-20 | 1982-10-14 | Ceramic composite materials with high mechanical and heat resistance and their preparation |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4461842A (enExample) |
| EP (1) | EP0078197B1 (enExample) |
| JP (1) | JPS5879875A (enExample) |
| AU (1) | AU549206B2 (enExample) |
| BR (1) | BR8206092A (enExample) |
| CA (1) | CA1201279A (enExample) |
| DE (1) | DE3265260D1 (enExample) |
| ES (1) | ES516598A0 (enExample) |
| FR (1) | FR2514752A1 (enExample) |
| IL (1) | IL66923A (enExample) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2547577B1 (fr) * | 1983-06-20 | 1989-12-15 | Aerospatiale | Matiere refractaire composite renforcee de fibres refractaires et son procede de fabrication |
| DE3444406A1 (de) * | 1984-12-05 | 1986-06-05 | Kolbenschmidt AG, 7107 Neckarsulm | Gegossene bauteile fuer brennkraftmaschinen mit eingegossenen bewehrungskoerpern sowie verfahren zur herstellung der verbindung zwischen den bauteilen und den bewehrungskoerpern |
| JPS62230680A (ja) * | 1986-03-31 | 1987-10-09 | 住友電気工業株式会社 | セラミツクス複合体の製造方法 |
| JPS63215574A (ja) * | 1987-03-04 | 1988-09-08 | 品川白煉瓦株式会社 | 耐火ブロックの製造方法 |
| FR2629814B1 (fr) * | 1988-04-06 | 1991-03-22 | Aerospatiale | Procede pour la realisation d'un materiau ceramique composite a structure fibreuse et materiau ainsi obtenu |
| US5167271A (en) * | 1988-10-20 | 1992-12-01 | Lange Frederick F | Method to produce ceramic reinforced or ceramic-metal matrix composite articles |
| GB2230259B (en) * | 1989-04-14 | 1993-11-17 | Gen Electric | Fibre reinforced ceramic matrix composite member and method for making |
| US5162270A (en) * | 1991-08-27 | 1992-11-10 | Third Millennium Technologies, Inc. | Structural ceramics incorporating boron carbide whiskers for the strengthening thereof |
| US5856252A (en) * | 1995-06-07 | 1999-01-05 | The Regents Of The University Of California | Damage tolerant ceramic matrix composites by a precursor infiltration |
| US5573985A (en) * | 1995-09-18 | 1996-11-12 | Millennium Materials, Inc. | Ceramic matrix composites using strengthening agents of silicon borides of the form Si-B-C |
| RU2127712C1 (ru) * | 1997-01-27 | 1999-03-20 | Борис Геннадиевич Гольденфанг | Способ получения теплоизоляционного материала на основе минерального волокна, способ и установка для формования изделия по этому способу |
| RU2162458C1 (ru) * | 1999-05-17 | 2001-01-27 | Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" им. С.П. Королева" | Способ изготовления высокотемпературного электроизоляционного стеклотекстолита |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3019117A (en) * | 1957-12-23 | 1962-01-30 | Johns Manville Fiber Glass Inc | Refractory blocks |
| US3752683A (en) * | 1969-10-06 | 1973-08-14 | Foseco Int | Protection of turbine casings |
| US3702279A (en) * | 1971-04-07 | 1972-11-07 | Atomic Energy Commission | Fibrous thermal insulation and method for preparing same |
| GB1423167A (en) * | 1972-04-18 | 1976-01-28 | Zirconal Processes Ltd | Method of binding ceramic fibres and articles made from ceramic fibres |
| JPS515309A (ja) * | 1974-07-02 | 1976-01-17 | Sharp Kk | Seramitsukukozotaino seizohoho |
| JPS5163812A (ja) * | 1974-11-30 | 1976-06-02 | Toyota Motor Co Ltd | Dannetsuyoseramitsukuseniseikeitai |
| JPS5247012A (en) * | 1975-10-13 | 1977-04-14 | Mitsuo Koji | Hardeing body containing inorganic fibers |
| JPS5851913B2 (ja) * | 1976-03-26 | 1983-11-18 | 三菱重工業株式会社 | 繊維強化セラミツクスの製造方法 |
| US4252588A (en) * | 1977-09-19 | 1981-02-24 | Science Applications, Inc. | Method for fabricating a reinforced composite |
| GB2049751B (en) * | 1979-05-11 | 1983-08-03 | Ultraseal International Ltd | Impregnation of porous articles |
| US4284664A (en) * | 1979-12-05 | 1981-08-18 | General Electric Company | Fiber reinforced ceramics produced without pressing or sintering using a slurry comprising a silicate and a powdered ceramic |
-
1981
- 1981-10-20 FR FR8119692A patent/FR2514752A1/fr active Granted
-
1982
- 1982-09-28 US US06/425,623 patent/US4461842A/en not_active Expired - Lifetime
- 1982-09-30 IL IL66923A patent/IL66923A/xx not_active IP Right Cessation
- 1982-10-14 CA CA000413416A patent/CA1201279A/en not_active Expired
- 1982-10-15 DE DE8282401902T patent/DE3265260D1/de not_active Expired
- 1982-10-15 EP EP82401902A patent/EP0078197B1/fr not_active Expired
- 1982-10-18 ES ES516598A patent/ES516598A0/es active Granted
- 1982-10-19 BR BR8206092A patent/BR8206092A/pt not_active IP Right Cessation
- 1982-10-19 JP JP57182236A patent/JPS5879875A/ja active Granted
- 1982-10-19 AU AU89481/82A patent/AU549206B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6319474B2 (enExample) | 1988-04-22 |
| FR2514752B1 (enExample) | 1984-03-23 |
| AU549206B2 (en) | 1986-01-16 |
| EP0078197A1 (fr) | 1983-05-04 |
| IL66923A0 (en) | 1982-12-31 |
| EP0078197B1 (fr) | 1985-08-07 |
| IL66923A (en) | 1986-01-31 |
| JPS5879875A (ja) | 1983-05-13 |
| US4461842A (en) | 1984-07-24 |
| BR8206092A (pt) | 1983-09-13 |
| AU8948182A (en) | 1983-04-28 |
| ES8306690A1 (es) | 1983-06-16 |
| DE3265260D1 (en) | 1985-09-12 |
| ES516598A0 (es) | 1983-06-16 |
| FR2514752A1 (fr) | 1983-04-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |