GB1603855A - Resin-impregnated sintered silver articles - Google Patents
Resin-impregnated sintered silver articles Download PDFInfo
- Publication number
- GB1603855A GB1603855A GB20002/77A GB2000277A GB1603855A GB 1603855 A GB1603855 A GB 1603855A GB 20002/77 A GB20002/77 A GB 20002/77A GB 2000277 A GB2000277 A GB 2000277A GB 1603855 A GB1603855 A GB 1603855A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resin
- article
- silver
- particles
- wax
- 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
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims description 28
- 229910052709 silver Inorganic materials 0.000 title claims description 25
- 239000004332 silver Substances 0.000 title claims description 25
- 229920005989 resin Polymers 0.000 claims description 53
- 239000011347 resin Substances 0.000 claims description 53
- 238000000034 method Methods 0.000 claims description 20
- 239000001993 wax Substances 0.000 claims description 16
- 239000011230 binding agent Substances 0.000 claims description 15
- 239000002923 metal particle Substances 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 14
- 239000002904 solvent Substances 0.000 claims description 9
- 238000001746 injection moulding Methods 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000005470 impregnation Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 6
- 239000013528 metallic particle Substances 0.000 claims description 5
- 239000012188 paraffin wax Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 229920000728 polyester Polymers 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 5
- 229910001111 Fine metal Inorganic materials 0.000 claims description 4
- NEIHULKJZQTQKJ-UHFFFAOYSA-N [Cu].[Ag] Chemical compound [Cu].[Ag] NEIHULKJZQTQKJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 229910000585 britannia silver Inorganic materials 0.000 claims description 3
- 239000010945 britannia silver Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 229920006397 acrylic thermoplastic Polymers 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 claims description 2
- 235000013871 bee wax Nutrition 0.000 claims description 2
- 239000012166 beeswax Substances 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- 125000003700 epoxy group Chemical group 0.000 claims description 2
- 150000002148 esters Chemical class 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 2
- 229910052753 mercury Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 239000000088 plastic resin Substances 0.000 claims description 2
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 claims description 2
- 235000013311 vegetables Nutrition 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 239000007970 homogeneous dispersion Substances 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000080 wetting agent Substances 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
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- 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
- B22F3/12—Both compacting and sintering
-
- 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
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
-
- 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
- B22F3/24—After-treatment of workpieces or articles
- B22F3/26—Impregnating
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Description
(54) RESIN-IMPREGNATED SINTERED SILVER ARTICLES (71) We, JOHNSON, MATTHEY & CO.,
LIMITED, a British Company, of 43 Hatton
Garden, London, EC1N 8EE do hereby declare the invention for which we pray that a Patent may be granted to us and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to the formation of a resin-impregnated sintered metallic article such as an article of costume jewellery.
Casting processes for the formation of metallic articles are well-known in the art but suffer from certain disadvantages, particularly in the production of articles having complex shapes or precise dimensions. It has, in the past, been the usual practice in such cases to cast an approximate shape somewhat oversize and then to grind or otherwise machine to the actual shape and within the tolerances required.
According to the present invention, a process for forming a metallic article comprises first forming a sintered porous shaped mass from silver particles and then impregnating the voids therein with a resin by evacuating the pores of the shaped mass, introducing the resin in liquid form so that it is drawn into the said pores, subjecting the mass to elevated pressure to complete the impregnation, and curing the resin.
Preferably, the porous shaped mass is formed by dissolving a meltable binder in a solvent, forming a slurry of the solution and metal particles, evaporating the solvent to give a mass or powder-like agglomerate of binder and metal particles, compacting and extruding said mass to give a shaped article and heating said article to remove said binder and sinter the metal particles.
In an alternative embodiment of the invention, the extruding step may be replaced with an injection moulding step.
The voids of the sintered article, which is of course porous, are impregnated with a resin material to render the article essentially non-porous. The impregnated article may, if desired, be subjected to any final machining, coining or polishing operations.
The proportion of metallic particles to binder is preferably selected so that the binder will substantially completely fill the voids between the particles at the compacted stage. If too much binder is used, the particles will not have sufficient mutual contact to provide a coherent form after sintering. On the other hand, too little binder leads to difficulties in extrusion or injection moulding and also tends to give a nonuniform density of product. The volume of binder relative to the volume of metallic particles is selected, subject to the overall practical limitations referred to above, according to the desired volume of said resin material which it is intended shall replace the binder in the finished article.
It is desirable that the metallic particles form an essentially homogeneous dispersion throughout the binder prior to extrusion or injection moulding and to this end a dispersion agent or wetting agent may be added to the slurry.
Typically, the meltable binder comprises paraffin wax, the solvent comprises carbon tetrachloride and a suitable dispersion agent comprises oleic acid. The metallic particles are not generally of any particular shape, for example spherical, and are typically but not essentially in the size range from 5-8 microns.
Preferably the resin comprises a polyester, an acrylic or an epoxy resin.
The invention will now be described by way of reference to the following example
A porous metallic sample containing 96%
Britannia silver was prepared as follows: 1. A supply of Johnson Matthey Type
EC silver powder particulate silver having an average particle size of 8 microns to 12 microns when a minus 200 mesh fraction of such a powder is measured on a Fisher Sub
Sieve Sizer.
2. Using a conventional powder metal compacting press a powder compact was produced at a relatively low pressure of 1 to 10 tons per square inch. The pressure should be adjusted to ensure that the compact is made to a density of about 6.0 gs/cc, i.e. 57% of the theoretical density of silver which is 10.5 gs/cc. If desired the powder may be precoated with synthetic resin or similar substance to improve the strength and precision of form.
3. Heat treat the compact for a suitable time at a convenient temperature, e.g. 34 minutes at 600"C to strengthen the compact further.
The porosity is then filled by impregnatin the article with a plastic resin.
By this means an article may be made of material which is predominantly silver by weight, e.g., 96% (Britannia) or 92.5% (Standard) and containing only a minor proportion by weight of resin, i.e. 4% or -/.5% respectively.
The resin impregnation step may be carried out as follows:1. Place heat treated article in an autoclave.
2. Close autoclave, operate vacuum sump and reduce pressure to a vacuum of 28t to 29" of mercury. Hold vacuum for 20 minutes.
3. Still under vacuum draw resin into autoclave to cover the article.
4. Shut off vacuum pump, allow interior to return to atmospheric pressure and then admit air under pressure until autoclave is at 90-100 p.s.i. Hold pressure for 30 minutes.
5. Resin is returned to reservoir, pressure released and article is then drained of resin.
Open autoclave and remove article.
6. Rinse article in cold water and dry.
7. Cure resin by heating article for 1 hour at 1300C.
Articles made in accordance with the above from Britannia silver exhibited the following characteristics: 1. Density-determined by weighing, measuring and calculation - 8.13 gs/cc. This compares well with the theoretical density of a material composed of 86.5% silver and 3.5% of resin, viz., 8.22 gs/cc.
The resin was said to have a density of 1.1 glcc.
The theoretical density of a conventional silver copper alloy containing 96.5% silver is 10.44 cc. Thus the silver resin product was of approximately 28% greater volume than an equivalent weight of silver copper of the same silver content.
2. The silver content determined by analysis was 96.5% 3. The silver content by volume calculated from the two determinations above was 75%.
In an alternative method according to the invention, the metal particles may be coated with a wax. After forming a compact by extrusion or injection moulding the wax is removed and the compact is sintered and impregnated with resin.
This alternative method overcomes the difficulties usually associated with compaction.
We have found that articles of complex form may easily be made by compaction of pretreated particles as follows: 1. To a supply of silver particles was added a proportion of paraffin wax so that the volume proportion of wax relative to the silver metal is the same as will be needed of resin in the finished article - approximately 6% by weight of wax in this example.
One method used to add or coat the metal particles with wax is to dissolve paraffin wax in carbon tetrachloride, add the metal particles and evaporate the solvent.
2. With a suitable set of tooling or dies in an extrusion press or in an injection moulding machine preforms of the required size and shape were made from the waxed particles.
3. The preforms, after removal of feeders and runners, were placed in a furnace or an oven and then heated to vaporise the wax and subsequently heat further to sinter the preform.
4. The pores of the preforms were then filled with resin in a similar manner to that described for the compacts. This resulted in an article containing 92.5 wt% standard (Sterling) silver and balance a resin of low density.
If desired, the resin may be loaded with fine metal or other particles or a colourant.
The waxes may be any suitable animal, mineral, vegetable or synthetic wax such as ester, beeswax and the higher molecular weight paraffins.
The resin used in the above example was a polyester thermosetting resin sold under the Registered Trade Mark METALSEAL
V15 by Industrial Impregnations Ltd. of
Colnbrook, England.
However, other resins may be used such as acrylics, epoxys, polystyrene, polymethylmethacrylate with or without colourants.
further the resins may be used in the form of solutions or dispersions.
WHAT WE CLAIM IS:
1. A process for forming a metallic article comprising first forming a sintered porous shaped mass from silver particles and then impregnating the voids therein with a resin by evacuating the pores of the shaped mass, introducing the resin in liquid form so that it is drawn into the said pores, subjecting the mass to elevated pressure to complete the impregnation, and curing the resin.
2. A process according to claim 1 in which the resin is a polyester, an acrylic or an epoxy resin.
3. A process according to any preceding claim in which the resin is loaded with fine metal particles or a colourant.
4. A process according to claim 1 in which the porous shaped mass is formed by the steps of dissolving a meltable binder in a solvent, forming a slurry of the solution and metal particles, evaporating the solvent to get a mass or powder-like agglomerate of
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
1. A process for forming a metallic article comprising first forming a sintered porous shaped mass from silver particles and then impregnating the voids therein with a resin by evacuating the pores of the shaped mass, introducing the resin in liquid form so that it is drawn into the said pores, subjecting the mass to elevated pressure to complete the impregnation, and curing the resin.
2. A process according to claim 1 in which the resin is a polyester, an acrylic or an epoxy resin.
3. A process according to any preceding claim in which the resin is loaded with fine metal particles or a colourant.
4. A process according to claim 1 in which the porous shaped mass is formed by the steps of dissolving a meltable binder in a solvent, forming a slurry of the solution and metal particles, evaporating the solvent to get a mass or powder-like agglomerate of
binder and metal particles, compacting or forming said mass to give a shaped article and heating said article to remove said binder and sinter the metal particles.
5. A process according to claim 1 in which the porous shaped mass is made by compacting metal powder at a pressure in the range -10 tonnes per square inch.
6. A process according to claim 1 in which the porous shaped mass is formed by extrusion.
7. A process according to claim 1 in which the porous shaped mass is formed by injection moulding.
8. An article of manufacture comprising a sintered particulate metallic body having impregnated within voids between the metallic particles a cured resin material, and produced by a process as claimed in any preceding claim.
9. An article of manufacture produced substantially as hereinbefore described with reference to the example.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB20002/77A GB1603855A (en) | 1978-05-10 | 1978-05-10 | Resin-impregnated sintered silver articles |
FR7813962A FR2390230A1 (en) | 1978-05-10 | 1978-05-11 | DEVELOPMENT CONCERNING THE MANUFACTURE OF METAL ARTICLES |
AT0341778A ATA341778A (en) | 1978-05-10 | 1978-05-11 | METHOD FOR PRODUCING METAL ITEMS |
DE19782820974 DE2820974A1 (en) | 1978-05-10 | 1978-05-12 | PROCESS FOR MANUFACTURING METAL OBJECTS |
JP5647078A JPS5415406A (en) | 1978-05-10 | 1978-05-12 | Molding method of metal articles and articles made of sintered particle metal |
IT2331478A IT1094654B (en) | 1978-05-10 | 1978-05-12 | Metal articles, e.g. silver jewelry prepn. - from metal powder slurried in binder soln., by evapn., shaping and sintering |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB20002/77A GB1603855A (en) | 1978-05-10 | 1978-05-10 | Resin-impregnated sintered silver articles |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1603855A true GB1603855A (en) | 1981-12-02 |
Family
ID=10138714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20002/77A Expired GB1603855A (en) | 1978-05-10 | 1978-05-10 | Resin-impregnated sintered silver articles |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS5415406A (en) |
AT (1) | ATA341778A (en) |
DE (1) | DE2820974A1 (en) |
FR (1) | FR2390230A1 (en) |
GB (1) | GB1603855A (en) |
IT (1) | IT1094654B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2126251A (en) * | 1982-09-14 | 1984-03-21 | Worcester Controls Corp | Sintered plastic impregnated metal body |
US4822694A (en) * | 1986-11-03 | 1989-04-18 | Asulab S.A. | Composite material |
US4968739A (en) * | 1988-11-29 | 1990-11-06 | Daicel Chemical Industries, Ltd. | Composition and method for producing a metallic sintered body |
WO2017037043A1 (en) * | 2015-08-31 | 2017-03-09 | Koninklijke Philips N.V. | Grid for selective transmission of x-ray radiation, and method of manufacturing such a grid |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3004209C2 (en) * | 1980-02-06 | 1983-02-03 | Sintermetallwerk Krebsöge GmbH, 5608 Radevormwald | Process for compacting powders and metals and their alloys into pre-pressed bodies |
DE3120501C2 (en) * | 1981-05-22 | 1983-02-10 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | "Process and device for the production of molded parts" |
WO1988007903A1 (en) * | 1987-04-09 | 1988-10-20 | Ceramic Process Systems Corporation | Complex ceramic and metallic shapes by low pressure forming and sublimative drying |
DE69009911T2 (en) * | 1989-09-05 | 1994-09-22 | Sumitomo Electric Industries | Electrode for electrical discharge machining. |
US5258151A (en) * | 1991-06-01 | 1993-11-02 | Hoechst Aktiengesellschaft | Molding composition for the production of inorganic sintered products |
IT1260928B (en) * | 1993-07-16 | 1996-04-29 | Fiat Auto Spa | PROCEDURE FOR THE REALIZATION OF METAL AND / OR CERAMIC SHEETS THROUGH SINTERING OF DUST AND RELATED PRODUCT. |
DE69432546T2 (en) * | 1993-09-16 | 2003-11-20 | Sumitomo Electric Industries, Ltd. | Metal housing for semiconductor device and method for its production |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1010978A (en) * | 1948-11-16 | 1952-06-17 | Edras | Process for obtaining complex masses by agglomeration of metal powders |
FR1466697A (en) * | 1966-01-25 | 1967-01-20 | Coors Porcelain Co | Process for the manufacture of ceramic objects |
GB1470054A (en) * | 1973-04-02 | 1977-04-14 | British Leyland Uk Ltd | Powdered metal components |
-
1978
- 1978-05-10 GB GB20002/77A patent/GB1603855A/en not_active Expired
- 1978-05-11 AT AT0341778A patent/ATA341778A/en not_active Application Discontinuation
- 1978-05-11 FR FR7813962A patent/FR2390230A1/en not_active Withdrawn
- 1978-05-12 IT IT2331478A patent/IT1094654B/en active
- 1978-05-12 DE DE19782820974 patent/DE2820974A1/en not_active Withdrawn
- 1978-05-12 JP JP5647078A patent/JPS5415406A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2126251A (en) * | 1982-09-14 | 1984-03-21 | Worcester Controls Corp | Sintered plastic impregnated metal body |
US4822694A (en) * | 1986-11-03 | 1989-04-18 | Asulab S.A. | Composite material |
US4968739A (en) * | 1988-11-29 | 1990-11-06 | Daicel Chemical Industries, Ltd. | Composition and method for producing a metallic sintered body |
WO2017037043A1 (en) * | 2015-08-31 | 2017-03-09 | Koninklijke Philips N.V. | Grid for selective transmission of x-ray radiation, and method of manufacturing such a grid |
Also Published As
Publication number | Publication date |
---|---|
IT1094654B (en) | 1985-08-02 |
FR2390230A1 (en) | 1978-12-08 |
ATA341778A (en) | 1982-12-15 |
JPS5415406A (en) | 1979-02-05 |
DE2820974A1 (en) | 1978-11-16 |
IT7823314A0 (en) | 1978-05-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |