GB2245590A - Gold alloy for black coloring, processed article of black colored gold alloy and method for production of the processed article - Google Patents
Gold alloy for black coloring, processed article of black colored gold alloy and method for production of the processed article Download PDFInfo
- Publication number
- GB2245590A GB2245590A GB9014240A GB9014240A GB2245590A GB 2245590 A GB2245590 A GB 2245590A GB 9014240 A GB9014240 A GB 9014240A GB 9014240 A GB9014240 A GB 9014240A GB 2245590 A GB2245590 A GB 2245590A
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- GB
- United Kingdom
- Prior art keywords
- gold
- gold alloy
- weight
- alloy
- black
- 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.)
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- 239000003353 gold alloy Substances 0.000 title claims abstract description 73
- 229910001020 Au alloy Inorganic materials 0.000 title claims abstract description 70
- 238000004040 coloring Methods 0.000 title abstract description 29
- 238000004519 manufacturing process Methods 0.000 title description 5
- 229910000960 colored gold Inorganic materials 0.000 title description 4
- 238000000034 method Methods 0.000 claims description 12
- 239000010931 gold Substances 0.000 abstract description 44
- 229910052737 gold Inorganic materials 0.000 abstract description 37
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 36
- 229910052751 metal Inorganic materials 0.000 abstract description 20
- 229910052802 copper Inorganic materials 0.000 abstract description 9
- 229910052742 iron Inorganic materials 0.000 abstract description 9
- 229910052759 nickel Inorganic materials 0.000 abstract description 9
- 238000005275 alloying Methods 0.000 abstract description 8
- 230000001590 oxidative effect Effects 0.000 abstract description 8
- 229910052763 palladium Inorganic materials 0.000 abstract description 7
- 229910052741 iridium Inorganic materials 0.000 abstract description 6
- 229910052697 platinum Inorganic materials 0.000 abstract description 6
- 229910052703 rhodium Inorganic materials 0.000 abstract description 6
- 238000007792 addition Methods 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 239000000203 mixture Substances 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 9
- 238000005266 casting Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 229910052709 silver Inorganic materials 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 6
- 229910052762 osmium Inorganic materials 0.000 description 5
- 229910052707 ruthenium Inorganic materials 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229910017944 Ag—Cu Inorganic materials 0.000 description 1
- 229910002708 Au–Cu Inorganic materials 0.000 description 1
- 229910002482 Cu–Ni Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- GMMAPXRGRVJYJY-UHFFFAOYSA-J tetrasodium 4-acetamido-5-hydroxy-6-[[7-sulfonato-4-[(4-sulfonatophenyl)diazenyl]naphthalen-1-yl]diazenyl]naphthalene-1,7-disulfonate Chemical compound [Na+].[Na+].[Na+].[Na+].OC1=C2C(NC(=O)C)=CC=C(S([O-])(=O)=O)C2=CC(S([O-])(=O)=O)=C1N=NC(C1=CC(=CC=C11)S([O-])(=O)=O)=CC=C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 GMMAPXRGRVJYJY-UHFFFAOYSA-J 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C27/00—Making jewellery or other personal adornments
- A44C27/001—Materials for manufacturing jewellery
- A44C27/002—Metallic materials
- A44C27/003—Metallic alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/02—Alloys based on gold
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Adornments (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Contacts (AREA)
Abstract
A gold alloy for black coloring comprises gold and at least one coloring metallic element selected from the group consisting of Cu, Fe, Co and Ti with optional additions of at least one alloying element selected from the group consisting of Pt, Pd, Rh, Ir, flu, Os, Ag and Ni and/or of Zn. The gold alloy mentioned above, may be heat-treated in an oxidizing atmosphere and cooled.
Description
GOLD ALLOY FOR BLACK COLORING, PROCESSED ARTICLE OF BLACK COLORED GOLD
ALLOY AND METHOD FOR PRODUCTION OF THE PROCESSED ART-ICLE This invention relates to a gold alloy suitable for producing a colored gold alloy possessing a glossy black surface layer and used in ornaments of precious metal, a processed article of gold alloy, and a method for the production of the processed article.
As ornaments of gold, processed articles of 18- carat gold, i e an alloy having a gold content of 75 % by weight are widely available on the market The 18-carat gold is characterized by possessing the stablest mechanical, physical, and chemical properties, excelling in workability, and permitting easy variation of hue The processed articles of gold inherently have a gold hue and, because of this hue, are esteemed highly as ornaments In recent years, processed articles of gold have become increasingly intricate in design and demand for such articles in a wider variety of hues has increased.
The hues in which the products of gold alloys meeting this demand are currently available include a light greenish yellow color of the Au-Ag alloy (Metal Data Book, page 186, Maruzen, 1984), a yellow color of the Au- Ag-Cu alloy (ibid), a red color of the Au-Cu alloy (ibid), and a light yellowish white color of the Au-Cu-Ni -3 gold alloys for black coloring having the compositions described above, further comprising Zn, and containing the Zn in a concentration in the range of 0 5 to 10 % by weight; a processed article of gold alloy possessing a glossy black surface layer, obtained by shaping a gold alloy comprising gold and at least one coloring metallic element selected from the group consisting of Cu, Fe, Co, and Ti and containing the coloring metallic element in a concentration in the range of 5 to 65 % by weight, then heat-treating the shaped gold alloy in an oxidizing atmosphere at a temperature not exceeding the melting temperature of the gold alloy, and thereafter cooling the resultant shaped gold alloy; a processed article of gold alloy possessing a glossy black surface layer, obtained by shaping a gold alloy comprising gold, at least one alloying element selected from the group consisting of Pt, Pd, Rh, Ir, Ru, Os, Ag, and Ni, and at least one coloring metallic element selected from the group consisting of Cu, Fe, Co, and Ti, containing the gold in a proportion of at least 38 % by weight to the sum of the amount of the gold and the amount of the alloying element, having the content of the coloring metallic element in the gold alloy in the range of 5 to 40 % by weight in the case of Cu, 3 to 40 % by weight in the case of Fe, 3 to 40 % by weight in the case of Co, or 1 to 10 % by weight in the case of Ti, and having the total content of component element other than gold of the gold alloy in the range of 5 to 65 % by weight, then heat-treating the shaped gold alloy in an oxidizing atmosphere at a temperature not exceeding the melting temperature of the gold alloy, and thereafter cooling the resultant shaped gold alloy; processed articles of gold alloys possessing a glossy black surface layer having the compositions of gold alloy, which methods use gold alloys having the compositions described above, further comprising Zn, and containing the Zn in a concentration in the range of 0 5 to 10 % by weight.
This invention is based on the development of a novel gold alloy for black coloring The gold alloy of this invention is characterized by comprising gold and 5 to 65 % by weight of at least one coloring metallic element selected from the group consisting of Cu, Fe, Co, and Ni.
If the content of the coloring metallic element is less than 5 % by weight, the alloy composition cannot acquire the black layer on the surface as aimed at by the coloring treatment If this content exceeds 65 % by weight, the produced gold alloy is no longer capable of retaining the excellent characteristic properties inherent to the gold alloy of this invention.
Part of the gold in the gold alloy may be replaced by at least one member selected from the group consisting of the platinum group elements (Pt, Pd, Rh, Ir, Ru, and Os), Ag, and Ni In this case, the gold alloy is required to contain the gold in a proportion of at least 38 % by weight to the sum of the amount of the gold and the amount of at least one member selected from the group consisting of the platinum group elements, Ag, and Ni If the proportion is less than 38 % by weight, the final produced gold alloy no longer retains the characteristic quality of carat gold When part of the gold is replaced by at least one member selected from the group consisting of the platinum group elements, Ag, and Ni, the content of the coloring metallic element in the gold alloy is required to be in the range of 5 to 40 % by weight in the case of Cu, 3 to 40 % by weight in the case of Fe, 3 to 40 % by weight in the case of Co, or 1 to 10 % by weight in the case of Ti It is further an essential requirement that the total content of component elements other than gold -7 case, it is desired during the course of the casting to improve the filling property of the melt in the cavity of the mold by utilizing the pressure of inert gas or centrifugal force.
Then, on the casting product consequently obtained, proper finishing work such as, for example, filing, flaking, polishing with a grindstone, and buffing, is conducted.
Then, the finished casting product is heated in the atmosphere or in an oxidizing atmosphere kept under a pressure higher or lower than the partial pressure of the oxygen in the atmosphere and subsequently cooled suitably in the medium of air, oil, or water.
The temperature of the heating is lower than the melting point of the alloy composition of the casting product To be specific, this temperature is approximately in the range of 7000 C to 95000 when the heating is carried out in the natural atmosphere.
Generally, the temperature is not less than 70000 C The duration of the heating is determined by the size of the casting product and the degree of black color of the product The degree of black color increases in proportion as the duration of the heating is lengthened, for example When the processed article is a small product such as, for example, a ring or a brooch, the heating time is generally in the range of 20 to 30 minutes When the processed article has a slightly larger size, the heating time is sufficient in the range of 30 to minutes.
In consequence of the heat treatment performed as described above, the surface layer of the processed article acquires a black color.
When the black color developed on the surface of the processed article by slight buffing performed after completion of the treatment for black color development -9 soaked in the air at 8000 C for 20 minutes for coloring, and subsequently cooled with water When the processed articles were subsequently polished again by buffing, they acquired a brilliant black color Consequently, there were obtained processed articles of gold alloy each possessing a glossy black surface layer The black surface layers were approximately 3 to 4 um in thickness.
These black surface layers were composed of Au-containing Co O.
EXAMPLES 2 TO 16 Mixtures of pure gold with different elements were melted in the same manner as in Example 1 The resultant gold alloys were cast The casting products (ring and brooch) were soaked in the air and then cooled in the same manner as in Example 1 Consequently, there were obtained processed articles of gold alloy each possessing a glossy black surface layer.
The alloy compositions, the heating conditions, and the black surface layers were as shown in Table 1.
11 - EXAMPLES 17 TO 31 Processed articles of black colored gold alloy were obtained by following the procedure of Example 1, except that the alloy compositions were varied as indicated in Table 2 The black surface layers consequently formed measured 3 to 4 um in thickness and possessed a beautiful appearance.
EXAMPLE 32
A mixture consisting of 75 g of pure Au, 10 g of pure Pd, and 15 g of electrolytic Co was melted and cast in the same manner as in Example 1 The casting products (ring and brooch) consequently obtained were soaked in the air at 8000 C for 20 minutes for coloring, then cooled with air, and polished again by buffing As a result, beautiful, glossy black products were obtained The black surface layers formed by the coloring treatment measured 3 to 4 pm in thickness and were composed of Au, Pd, and Co O.
EXAMPLES 33 TO 42 Processed articles of gold alloy possessing a glossy black surface layer were obtained by following the procedure of Example 1, except that the alloy compositions were varied The alloy compositions, the heating conditions, and the black surface layers were as shown in Table 3.
_ 15 EXAMPLES 43 TO 57 Coloring processed articles of gold alloy were obtained by following the procedure of Example 1, except that alloy compositions were varied as indicated in Table 4 The black surface layers consequently formed measured 4 to 6 um in thickness and possessed a beautiful appearance.
17 - B The following working examples involved gold alloys of 14 carats (Au content 58 3 % by weight).
Processed articles of gold alloy possessing a black surface layer were obtained by following the procedure of Example 1, except that pure Au was mixed with different elements as shown in Table 5 The black surface layers in these products all measured approximately 5 to 6 Ium.
19 - C The following working examples involved gold alloys of carats (Au content 41 7 % by weight).
Processed articles of gold alloy possessing a black surface layer were obtained by following the procedure of Example 1, except that pure Au was mixed with different elements as shown in Table 6 The black surface layers in these products all measured approximately 5 to 6 )um.
COMPARATIVE EXPERIMENTS 1 TO 4 Processed articles of gold alloy were obtained by following the procedure of Example 1, except that pure Au was mixed with different elements as indicated in Table 7.
The surface layers formed on these processed articles possessed a color of yellow mixed with gray The black surface layers contemplated by this invention were not obtained in these processed products.
Table 7
Comparative Experiment No 1 2 3 4 Composition Pure Au 75 75 75 75 Oxygen-free Cu 1 Electrolytic iron 3 1 Electrolytic Co 3 2 1 5 Pure Ti 0 5 Pure Pt 10 Pure Pd o 10 Pure Ag 22 12 12 12 Electrolytic Ni 10 element in said gold alloy in the range of 5 to 40 % by weight in the case of Cu, 3 to 40 % by weight in the case of Fe, 3 to 40 % by weight in the case of Co, or 1 to 10 % by weight in the case of Ti, and having the total content of component elements other than gold of said gold alloy in the range of 5 to 65 % by weight.
4 A gold alloy for black coloring, characterized by consisting essentially of gold, at least one alloying element selected from the group consisting of Pt, Pd, Rh, Ir, Ru, Os, Ag, and Ni, at least one coloring metallic element selected from the group consisting of Cu, Fe, Co, and Ti, and Zn, containing said gold in a proportion of at least 38 % by weight to the sum of the amount of said gold and the amount of said alloying element, having the content of said coloring metallic element in said gold alloy in the range of 5 to 40 % by weight in the case of Cu, 3 to 40 % by weight in the case of Fe, 3 to 40 % by weight in the case of Co, or 1 to 10 % by weight in the case of Ti, containing Zn in a concentration in the range of 0 5 to 10 % by weight, and having the total content of component elements other than gold of said gold alloy in the range of 5 to 65 % by weight.
A processed article of gold alloy possessing a glossy black surface layer, characterized by being obtained by shaping a gold alloy comprising gold and at least one coloring metallic element selected from the group consisting of Cu, Fe, Co, and Ti and containing said coloring metallic element in a concentration in the range of 5 to 65 % by weight, then heat-treating the shaped gold alloy in an oxidizing atmosphere at a temperature not exceeding the melting temperature of said gold alloy, and thereafter cooling the resultant shaped gold alloy.
8 A processed article of gold alloy possessing a glossy black surface layer, characterized by being obtained by shaping a gold alloy comprising gold, at least one alloying element selected from the group consisting of Pt, Pd, Rh, Ir, Ru, Os, Ag, and Ni, at least one coloring metallic element selected from the group consisting of Cu, Fe, Co, and Ti, and Zn, containing said gold in a proportion of at least 38 % by weight to the sum of the amount of said gold and the amount of said alloying element, having the content of said coloring metallic element in said gold alloy in the range of 5 to 40 % by weight in the case of Cu, 3 to 40 % by weight in the case of Fe, 3 to 40 % by weight in the case of Co, or 1 to 10 % by weight in the case of Ti, containing Zn in a concentration in the range of 0 5 to 10 % by weight, and having the total content of component elements other than gold of said gold alloy in the range of 5 to 65 % by weight, then heat-treating the shaped gold alloy in an oxidizing atmosphere at a temperature not exceeding the melting temperature of said gold alloy, and thereafter cooling the resultant shaped gold alloy.
9 A method for the production of a processed article of gold alloy possessing a glossy black surface layer, characterized by consisting essentially of shaping a gold alloy comprising gold and at least one coloring metallic element selected from the group consisting of Cu, Fe, Co, and Ti, and containing said coloring metallic element in a concentration in the range of 5 to 65 % by weight, then heat-treating the shaped gold alloy in an oxidizing atmosphere at a temperature not exceeding the melting temperature of said gold alloy, and thereafter cooling the resultant gold alloy.
A method for the production of a processed 10.
k 27 - layer, characterized by consisting essentially of shaping a gold alloy comprising gold, at least one alloying element selected from the group consisting of Pt, Pd, Rh, Ir, Ru, Os, Ag, and Ni, at least one coloring metallic element selected from the group consisting of Cu, Fe, Co, and Ti, and Zn, containing said gold in a proportion of at least 38 % by weight to the sum of the amount of said gold and the amount of said metallic element, having the content of said coloring metallic element in said gold alloy in the range of 5 to 40 % by weight in the case of Cu, 3 to 40 % by weight in the case of Fe, 3 to 40 % by weight in the case of Co, or 1 to 10 % by weight in the case of Ti, containing Zn in a concentration in the range of 0 5 to 10 % by weight, and having the total content of component elements other than gold of said gold alloy in the range of 5 to 65 % by weight, then heat-treating the shaped gold alloy in an oxidizing atmosphere at a temperature not exceeding the melting temperature of said gold alloy, and thereafter cooling the resultant gold alloy.
Claims (1)
13 A gold alloy as claimed in Claim 1 and substantially as described in
the examples.
14 A processed article as claimed in Claim 5 and substantially as described in the examples.
A method as claimed in Claim 9 substantially as described with reference to the examples.
Published 1991 at The Patent Office Concept House Cardiff Road Newport Gwent NP 9 IREH Further copies may be obtained from Sales Branch Unit 6 Nine Mile Point Cwmfelinfach Cross Keys Newport, N Pl 7 HZ Printed by Multiplex techniques ltd, St Mary Cray Kent.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1045420A JPH02225655A (en) | 1989-02-28 | 1989-02-28 | Gold alloy capable of coloring into bright black color and coloring method therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9014240D0 GB9014240D0 (en) | 1990-08-15 |
| GB2245590A true GB2245590A (en) | 1992-01-08 |
Family
ID=12718777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9014240A Withdrawn GB2245590A (en) | 1989-02-28 | 1990-06-26 | Gold alloy for black coloring, processed article of black colored gold alloy and method for production of the processed article |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPH02225655A (en) |
| CH (1) | CH680735A5 (en) |
| DE (1) | DE4020329A1 (en) |
| FR (1) | FR2643649B1 (en) |
| GB (1) | GB2245590A (en) |
| IT (1) | IT1240937B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2302694B (en) * | 1995-06-27 | 1998-11-11 | Silmar Spa | A gold alloy |
| WO2010027329A1 (en) * | 2008-09-08 | 2010-03-11 | Autium Pte Ltd | Coloured gold alloy and method for forming the same |
| IT201800004444A1 (en) * | 2018-04-12 | 2019-10-12 | 14K GOLD ALLOY RESISTANT TO TARNISHING AND PRODUCTION METHOD OF THE SAME | |
| EP3553192A1 (en) * | 2018-04-12 | 2019-10-16 | Argor-Heraeus S.A. | Tarnishing resistant gold alloy at 14k and method of production thereof |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02197539A (en) * | 1989-01-26 | 1990-08-06 | Tanaka Kikinzoku Kogyo Kk | Co-containing noble metallic material for ornaments |
| JPH04183836A (en) * | 1990-11-19 | 1992-06-30 | Seiko Instr Inc | Surface hardened colored gold alloy |
| JPH0657356A (en) * | 1991-11-14 | 1994-03-01 | Nippon Kogyo Ginkou:Kk | Gold alloy for decoration |
| US5853661A (en) * | 1994-07-05 | 1998-12-29 | Cendres Et Metaux Sa | High gold content bio--compatible dental alloy |
| WO2006111178A1 (en) * | 2005-04-19 | 2006-10-26 | Ludwig Müller S.A. | Precious metal alloy |
| CH697875B1 (en) * | 2005-07-16 | 2009-03-13 | Ludwig Mueller | precious metal alloy. |
| EP3040790A1 (en) * | 2014-12-29 | 2016-07-06 | Montres Breguet S.A. | Timepiece or piece of jewellery made of a light titanium-based precious alloy |
| RU2625199C1 (en) * | 2016-07-11 | 2017-07-12 | Юлия Алексеевна Щепочкина | Gold-based alloy |
| CN112251625B (en) * | 2020-10-15 | 2022-04-15 | 深圳市宝瑞莱珠宝首饰有限公司 | Fading-resistant 18K black gold processing technology for jewelry |
| EP4249149A1 (en) | 2022-03-24 | 2023-09-27 | Richemont International S.A. | Composite gold material for dark colouring and method for manufacturing same |
| IT202200010889A1 (en) * | 2022-05-25 | 2023-11-25 | Patros S R L | Method for obtaining an object comprising titanium for jewellery, goldsmithing or costume jewelery and object thus obtained. |
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| DE3502914A1 (en) * | 1985-01-29 | 1986-07-31 | International Gold Corp. Ltd., Johannesburg | USE OF TITANIUM GOLD ALLOYS |
| DE3835593C1 (en) * | 1988-10-19 | 1989-11-16 | Degussa Ag, 6000 Frankfurt, De |
-
1989
- 1989-02-28 JP JP1045420A patent/JPH02225655A/en active Pending
- 1989-12-04 CH CH4326/89A patent/CH680735A5/de not_active IP Right Cessation
-
1990
- 1990-01-12 IT IT67023A patent/IT1240937B/en active IP Right Grant
- 1990-01-29 FR FR9000981A patent/FR2643649B1/en not_active Expired - Fee Related
- 1990-06-26 DE DE4020329A patent/DE4020329A1/en not_active Ceased
- 1990-06-26 GB GB9014240A patent/GB2245590A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3189482A (en) * | 1961-03-09 | 1965-06-15 | Gen Mills Inc | Metal film resistor and method of its formation |
| GB1519578A (en) * | 1976-05-14 | 1978-08-02 | Howmedica | Low intrinsic value alloys |
| GB2041974A (en) * | 1979-01-18 | 1980-09-17 | Murao Shoten | Gold alloy |
| GB2066291A (en) * | 1979-12-14 | 1981-07-08 | Atomic Energy Authority Uk | Ternary alloys |
| GB2091294A (en) * | 1981-01-16 | 1982-07-28 | Citizen Watch Co Ltd | Pink-tinted gold alloy |
| GB2108152A (en) * | 1981-10-27 | 1983-05-11 | Leybold Heraeus Gmbh & Co Kg | Gold alloy for sputtering targets |
| EP0101936A2 (en) * | 1982-07-28 | 1984-03-07 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Boride-dispersed alloy material and process for manufacturing same |
| GB2138027A (en) * | 1983-04-12 | 1984-10-17 | Citizen Watch Co Ltd | A process for plating an article with a gold-based alloy and an alloy therefor |
| GB2184457A (en) * | 1985-12-06 | 1987-06-24 | Vittorio Antoniazzi | Gold alloy for jewellery |
| EP0234790A1 (en) * | 1986-02-07 | 1987-09-02 | Citizen Watch Co. Ltd. | Permanent magnetic alloy comprising gold, platinum and cobalt |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2302694B (en) * | 1995-06-27 | 1998-11-11 | Silmar Spa | A gold alloy |
| WO2010027329A1 (en) * | 2008-09-08 | 2010-03-11 | Autium Pte Ltd | Coloured gold alloy and method for forming the same |
| IT201800004444A1 (en) * | 2018-04-12 | 2019-10-12 | 14K GOLD ALLOY RESISTANT TO TARNISHING AND PRODUCTION METHOD OF THE SAME | |
| EP3553192A1 (en) * | 2018-04-12 | 2019-10-16 | Argor-Heraeus S.A. | Tarnishing resistant gold alloy at 14k and method of production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| IT9067023A1 (en) | 1991-07-12 |
| FR2643649A1 (en) | 1990-08-31 |
| IT9067023A0 (en) | 1990-01-12 |
| IT1240937B (en) | 1993-12-27 |
| DE4020329A1 (en) | 1992-01-02 |
| GB9014240D0 (en) | 1990-08-15 |
| CH680735A5 (en) | 1992-10-30 |
| FR2643649B1 (en) | 1994-05-13 |
| JPH02225655A (en) | 1990-09-07 |
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| Date | Code | Title | Description |
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| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |