US3658517A - Production of strip from powdered metal - Google Patents
Production of strip from powdered metal Download PDFInfo
- Publication number
- US3658517A US3658517A US838325A US3658517DA US3658517A US 3658517 A US3658517 A US 3658517A US 838325 A US838325 A US 838325A US 3658517D A US3658517D A US 3658517DA US 3658517 A US3658517 A US 3658517A
- Authority
- US
- United States
- Prior art keywords
- process according
- support surface
- slurry
- coating
- release agent
- 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
- 239000012255 powdered metal Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 17
- 239000000194 fatty acid Substances 0.000 claims abstract description 17
- 229930195729 fatty acid Natural products 0.000 claims abstract description 17
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000576 coating method Methods 0.000 claims description 17
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 9
- 239000010408 film Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 239000000725 suspension Substances 0.000 claims description 7
- 125000005313 fatty acid group Chemical group 0.000 claims description 6
- 235000021355 Stearic acid Nutrition 0.000 claims description 5
- 239000001913 cellulose Substances 0.000 claims description 5
- 229920002678 cellulose Polymers 0.000 claims description 5
- 238000005056 compaction Methods 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 5
- 150000005846 sugar alcohols Polymers 0.000 claims description 5
- 239000010409 thin film Substances 0.000 claims description 5
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 4
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 4
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 4
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000005642 Oleic acid Substances 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 4
- 229920001296 polysiloxane Chemical class 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 239000008117 stearic acid Substances 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 229920001515 polyalkylene glycol Polymers 0.000 claims description 3
- 238000007581 slurry coating method Methods 0.000 claims description 3
- 235000000346 sugar Nutrition 0.000 claims description 3
- 150000008163 sugars Chemical class 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 229920003086 cellulose ether Polymers 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- 150000002888 oleic acid derivatives Chemical class 0.000 claims 1
- 239000011230 binding agent Substances 0.000 abstract description 15
- 239000000843 powder Substances 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 235000021313 oleic acid Nutrition 0.000 abstract description 4
- 150000002889 oleic acids Chemical class 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 229910000640 Fe alloy Inorganic materials 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- -1 e.g. Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid group Chemical group C(CCCCCCC\C=C/CCCCCCCC)(=O)O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 2
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 2
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229930195725 Mannitol Natural products 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 229960004903 invert sugar Drugs 0.000 description 1
- 239000000594 mannitol Substances 0.000 description 1
- 235000010355 mannitol Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 235000010356 sorbitol Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
Definitions
- ABSTRACT A process is provided for rolling metal strip particularly iron or iron alloy strip, directly from powdered metal using a technique in which a self-supporting metal powder/binder strip is formed on a support surface from a slurry containing the metal and binder composition, the support surface being precoated with a release agent.
- Typical release agents are mono-basic fatty acids, such as steric and oleic acids.
- This invention relates to a process for the production of metal strip from powdered metal which is particularly, but not exclusively, applicable to the production of steel strip.
- the powdered metal is initially deposited onto the support surface as a coating in the form of a slurry comprising a suspension of metal powder in a binder composition, one example of a suitable binder composition being an aqueous methyl cellulose solution.
- the resulting metal powder binder strip is removed from the substrate and then subjected to rolling to effect compaction of the powdered metal and the compacted strip is then sintered.
- the slurry formed from the binder and the powdered metal is sufficiently viscous, little difficulty is normally experienced in cleanly stripping the dried film from a smooth substrate, such as a stainless steel band. It is, however, desirable in order to increase the line speed of the process to reduce the viscosity of the slurry to the minimum consistent with maintaining good metal powder/binder strip formation and adequate suspension of the powdered metal.
- the hygroscopic substance is a water-soluble polyhydroxy compound, such as glycerol, low moleculor weight polyalkylene glycols, e.g., trimethylene glycol, polyhydric alcohols, e.g., sorbitol, mannitol, and sugars, e.g., invert sugar.
- Inorganic hydroscopic materials may also be employed, such as calcium chloride.
- the hydroscopic substance is preferably present in an amount up to 1.0 percent by weight of the suspension employed. It has been noted that if a substantially larger portion of the hydroscopic substance is employed, too much water tends to be retained in the cellulose derivative during the slurry drying which leads to difficulties in the subsequent processing steps.
- the present application is concerned with a solution to the problem of undesirable adhesion to the substrate of dried films formed from powdered metal/binder compositions. We have now discovered, that this difficulty can be overcome by coating the substrate with a thin film of a release agent prior to the deposition of the slurry of powdered metal and binder composition.
- Suitable release agents are fatty acids, e.g., mono-basic acids such as oleic and stearic acids fluorinated hydrocarbons, particularly fluorinated hydrocarbon polymers,
- the release agent is desirably coated in a thin film onto the support surface and in the case of mono-basic fatty acid, this may be achieved directly (i.e. alone without the agency of a solvent or dispersant) or in the form of a solution or dispersion with subsequent removal of the continuous phase of the solution or dispersion.
- Convenient solvents for fatty acids are, for example, trichloroethylene or ethanol.
- the solution or dispersion (when used) may be applied to the support surface by any convenient method, such as roller coating, spraying or using a rotating lambswool coated roller impregnated with the solution.
- the continuous phase may be evaporated or allowed to evaporate before the suspension of powdered metal and binder composition is applied to the support surface.
- a 1 percent solution of a mono-basic fatty acid such as oleic or stearic acid
- a mono-basic fatty acid such as oleic or stearic acid
- trichloroethylene or ethanol a very thin film of oleic acid or stearic acid can be applied to the surface and this ensures that the deposited, dried metal powder/binder strip film can be readily removed from the substrate.
- the fatty acid is applied continuously to the support surface.
- the slurry is coated continuously onto an endless belt or drum, as described in our co-pending application Ser. No. 683,983 the fatty acid is conveniently applied continuously to the belt or drum at a point upstream of the slurry coating station.
- a process for the production of a strip from powdered metal which comprises:
- slurry comprising a suspension of powdered metal in an aqueous solution of a film-forming cellulose derivative, said slurry having a viscosity of less than 50,000 centipoises;
- the support surface is a drum or an endless metal belt onto which the slurry is continuously coated and from which the dried coating is continuously removed.
- release agent is a fluorinated hydrocarbon or a silicone.
- release agent is a fatty acid and is deposited on the support surface from a solution or dispersion.
- the slurry includes a hygroscopic substance selected from the group consisting of, low molecular weight polyalkylene glycols, polyhydric alcohols, sugars, and calcium chloride.
- a process for the production of a strip from powdered metal which comprises:
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Powder Metallurgy (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3295768 | 1968-07-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3658517A true US3658517A (en) | 1972-04-25 |
Family
ID=10346528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US838325A Expired - Lifetime US3658517A (en) | 1968-07-10 | 1969-07-01 | Production of strip from powdered metal |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3658517A (enrdf_load_stackoverflow) |
| AT (1) | AT295173B (enrdf_load_stackoverflow) |
| BE (1) | BE735806A (enrdf_load_stackoverflow) |
| ES (1) | ES369321A1 (enrdf_load_stackoverflow) |
| FR (1) | FR2012647A1 (enrdf_load_stackoverflow) |
| GB (1) | GB1257033A (enrdf_load_stackoverflow) |
| LU (1) | LU59065A1 (enrdf_load_stackoverflow) |
| NL (1) | NL6910545A (enrdf_load_stackoverflow) |
| SE (1) | SE356452B (enrdf_load_stackoverflow) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3839026A (en) * | 1966-11-18 | 1974-10-01 | British Steel Corp | PROCESS FOR THE PRODUCTION OF METAL STRIP FROM Fe POWDER |
| US4592780A (en) * | 1984-04-07 | 1986-06-03 | Mixalloy Limited | Production of flat products in strip sheet or like form |
| US4602954A (en) * | 1984-04-07 | 1986-07-29 | Mixalloy Limited | Metal strip |
| US4772322A (en) * | 1986-05-20 | 1988-09-20 | John Bellis | Production of flat products from particulate material |
| US4777015A (en) * | 1988-01-14 | 1988-10-11 | Gte Products Corporation | Process for producing tungsten heavy alloy sheet using a metallic salt binder system |
| US5011654A (en) * | 1989-07-29 | 1991-04-30 | Roy Mathers | Production of flat products |
| US5127146A (en) * | 1988-12-14 | 1992-07-07 | Sulzer Brothers, Ltd. | Method for production of thin sections of reactive metals |
| US5409660A (en) * | 1993-04-08 | 1995-04-25 | Corning Incorporated | Sintering metal parts with a release agent |
| US5590387A (en) * | 1993-10-27 | 1996-12-31 | H. C. Starck, Gmbh & Co, Kg | Method for producing metal and ceramic sintered bodies and coatings |
| US5903813A (en) * | 1998-07-24 | 1999-05-11 | Advanced Materials Products, Inc. | Method of forming thin dense metal sections from reactive alloy powders |
| US20030231973A1 (en) * | 2002-06-12 | 2003-12-18 | The University Of Chicago | Compositionally graded metallic plates for planar solid oxide fuel cells |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8621712D0 (en) * | 1986-09-09 | 1986-10-15 | Mixalloy Ltd | Flat products |
| WO2014148356A1 (ja) | 2013-03-18 | 2014-09-25 | インターメタリックス株式会社 | ＲＦｅＢ系焼結磁石製造方法及びＲＦｅＢ系焼結磁石 |
| KR20150128960A (ko) * | 2013-03-18 | 2015-11-18 | 인터메탈릭스 가부시키가이샤 | RFeB계 소결 자석 제조 방법 및 RFeB계 소결 자석 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3043728A (en) * | 1958-03-17 | 1962-07-10 | Nat Res Corp | Apparatus and process for metallic vapor coating |
| US3115698A (en) * | 1960-02-29 | 1963-12-31 | Gen Electric | Casting metal powders |
| US3284248A (en) * | 1963-01-07 | 1966-11-08 | Brown Co | Metal surface treatment |
| US3335000A (en) * | 1965-10-04 | 1967-08-08 | Texas Instruments Inc | Manufacture of metal foil |
| US3444032A (en) * | 1966-01-20 | 1969-05-13 | George J Kreier Jr | Metallic sculptured bas-relief article and method of forming the same |
| US3518756A (en) * | 1967-08-22 | 1970-07-07 | Ibm | Fabrication of multilevel ceramic,microelectronic structures |
-
1968
- 1968-07-10 GB GB3295768A patent/GB1257033A/en not_active Expired
-
1969
- 1969-07-01 US US838325A patent/US3658517A/en not_active Expired - Lifetime
- 1969-07-04 AT AT642669A patent/AT295173B/de active
- 1969-07-08 LU LU59065D patent/LU59065A1/xx unknown
- 1969-07-08 FR FR6923117A patent/FR2012647A1/fr not_active Withdrawn
- 1969-07-08 BE BE735806D patent/BE735806A/xx not_active IP Right Cessation
- 1969-07-09 ES ES369321A patent/ES369321A1/es not_active Expired
- 1969-07-09 SE SE09726/69A patent/SE356452B/xx unknown
- 1969-07-09 NL NL6910545A patent/NL6910545A/xx active Search and Examination
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3043728A (en) * | 1958-03-17 | 1962-07-10 | Nat Res Corp | Apparatus and process for metallic vapor coating |
| US3115698A (en) * | 1960-02-29 | 1963-12-31 | Gen Electric | Casting metal powders |
| US3284248A (en) * | 1963-01-07 | 1966-11-08 | Brown Co | Metal surface treatment |
| US3335000A (en) * | 1965-10-04 | 1967-08-08 | Texas Instruments Inc | Manufacture of metal foil |
| US3444032A (en) * | 1966-01-20 | 1969-05-13 | George J Kreier Jr | Metallic sculptured bas-relief article and method of forming the same |
| US3518756A (en) * | 1967-08-22 | 1970-07-07 | Ibm | Fabrication of multilevel ceramic,microelectronic structures |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3839026A (en) * | 1966-11-18 | 1974-10-01 | British Steel Corp | PROCESS FOR THE PRODUCTION OF METAL STRIP FROM Fe POWDER |
| US4592780A (en) * | 1984-04-07 | 1986-06-03 | Mixalloy Limited | Production of flat products in strip sheet or like form |
| US4602954A (en) * | 1984-04-07 | 1986-07-29 | Mixalloy Limited | Metal strip |
| US4772322A (en) * | 1986-05-20 | 1988-09-20 | John Bellis | Production of flat products from particulate material |
| US4777015A (en) * | 1988-01-14 | 1988-10-11 | Gte Products Corporation | Process for producing tungsten heavy alloy sheet using a metallic salt binder system |
| US5127146A (en) * | 1988-12-14 | 1992-07-07 | Sulzer Brothers, Ltd. | Method for production of thin sections of reactive metals |
| US5011654A (en) * | 1989-07-29 | 1991-04-30 | Roy Mathers | Production of flat products |
| US5409660A (en) * | 1993-04-08 | 1995-04-25 | Corning Incorporated | Sintering metal parts with a release agent |
| US5590387A (en) * | 1993-10-27 | 1996-12-31 | H. C. Starck, Gmbh & Co, Kg | Method for producing metal and ceramic sintered bodies and coatings |
| US5903813A (en) * | 1998-07-24 | 1999-05-11 | Advanced Materials Products, Inc. | Method of forming thin dense metal sections from reactive alloy powders |
| US20030231973A1 (en) * | 2002-06-12 | 2003-12-18 | The University Of Chicago | Compositionally graded metallic plates for planar solid oxide fuel cells |
| US6843960B2 (en) * | 2002-06-12 | 2005-01-18 | The University Of Chicago | Compositionally graded metallic plates for planar solid oxide fuel cells |
Also Published As
| Publication number | Publication date |
|---|---|
| NL6910545A (enrdf_load_stackoverflow) | 1970-01-13 |
| LU59065A1 (enrdf_load_stackoverflow) | 1969-11-20 |
| AT295173B (de) | 1971-12-27 |
| BE735806A (enrdf_load_stackoverflow) | 1969-12-16 |
| ES369321A1 (es) | 1971-07-16 |
| SE356452B (enrdf_load_stackoverflow) | 1973-05-28 |
| DE1935129B2 (de) | 1976-11-11 |
| GB1257033A (enrdf_load_stackoverflow) | 1971-12-15 |
| FR2012647A1 (enrdf_load_stackoverflow) | 1970-03-20 |
| DE1935129A1 (de) | 1970-01-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: MIXALLOY LTD, ANTELOPE INDUSTRIAL ESTATE, , Free format text: ASSIGNS THE ENTIRE INTEREST, SUBJECT TO LICENSE AND CONDITIONS RECITED;ASSIGNOR:BRITISH STEEL CORPORATION;REEL/FRAME:004146/0326 Effective date: 19830207 Owner name: BRITISH STEEL CORPORATION, 33 GROSVENOR PLACE LOND Free format text: ASSIGNOR AGREED TO TRANSFER THE ENTIRE INTEREST UNDER SAID PATENTS SUBJECT TO CONDITIONS RECITED;ASSIGNOR:BRITISH IRON AND STEEL RESEARCH ASSOCIATION, THE;REEL/FRAME:004146/0331 Effective date: 19790330 Owner name: MIXALLOY LTD, ANTELOPE INDUSTRIAL ESTATE, RHYDYMWY Free format text: ASSIGNS THE ENTIRE INTEREST, SUBJECT TO LICENSE AND CONDITIONS RECITED;ASSIGNOR:BRITISH STEEL CORPORATION;REEL/FRAME:004146/0326 Effective date: 19830207 Owner name: BRITISH STEEL CORPORATION, 33 GROSVENOR PLACE, LON Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BRITISH IRON AND STEEL RESEARCH ASSOCIATION, THE;REEL/FRAME:004146/0319 Effective date: 19811008 |