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Found results for
patents
1.
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Process for making finished or semi-finished articles of silver alloy
Application Number |
12830612 |
Grant Number |
09222150 |
Status |
In Force |
Filing Date |
2010-07-06 |
First Publication Date |
2010-10-21 |
Grant Date |
2015-12-29 |
Owner |
MIDDLESEX SILVER CO. LIMITED (United Kingdom)
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Inventor |
Johns, Peter Gamon
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Abstract
A process for making a finished or semi-finished article of silver alloy, said process comprising the steps of providing a silver alloy containing silver in an amount of at least 77 wt %, copper and an amount of germanium that is preferably at least 0.5 wt % and is effective to reduce tarnishing and/or firestain, making or processing the finished or semi-finished article of the alloy by heating at least to an annealing temperature, gradually cooling the article; and reheating the article to effect precipitation hardening thereof. The avoidance of quenching reduces the risk of damage to the article.
IPC Classes ?
- C22F 1/14 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon
- C22C 5/06 - Alloys based on silver
- C22C 5/08 - Alloys based on silver with copper as the next major constituent
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2.
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MASTER ALLOY MANUFACTURING
Application Number |
GB2007050034 |
Publication Number |
2007/083169 |
Status |
In Force |
Filing Date |
2007-01-23 |
Publication Date |
2007-07-26 |
Owner |
MIDDLESEX SILVER CO. LIMITED (United Kingdom)
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Inventor |
Johns, Peter, Gamon
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Abstract
A method is provided for method for making a gold alloy, including the steps of: (a) forming a master alloy consisting essentially of constituents of said gold alloy and inevitable impurities (e.g. an AgCu alloy, AgCuZn alloy, CuZn alloy or AgZn alloy optionally containing one or more incidental ingredients selected from Ni, Fe and Si.) ; and (b) melting together the master alloy and gold to form the desired gold alloy; wherein the step of forming the master alloy includes adding boron as a compound selecting from the group consisting of alkyl boron compounds, boron hydrides, boron halides metal borohydrides metal borohalides, and mixtures thereof. The boron compound may be added to the master alloy in the gas, liquid or solid phase, and in the latter embodiment to minimize evaporation of the boron on contact with the precursor alloy melt, the boron compound may be wrapped in a metal foil formed from constituents of the precious metal alloy or master alloy. The cast precious metal allo y or master alloy has been found to have a reduced number of hard spots when compared to conventional casting methods.
IPC Classes ?
- C22C 1/03 - Making non-ferrous alloys by melting using master alloys
- C22C 5/02 - Alloys based on gold
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3.
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SILVER WIRE
Application Number |
GB2006050171 |
Publication Number |
2007/023308 |
Status |
In Force |
Filing Date |
2006-06-28 |
Publication Date |
2007-03-01 |
Owner |
MIDDLESEX SILVER CO. LIMITED (United Kingdom)
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Inventor |
Bratton, Graham John
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Abstract
This invention relates to silver alloy fibres or wire of sufficiently small diameter that they have properties similar to conventional textile fibres, to structures e.g. woven, non-woven or knitted products from said fibres and to their manufacture. The fibres may be of Ag Cu Ge alloy and of diameter less than 200 m. The invention relates to articles e.g woven, non-woven, knitted, needle-punched twisted, linked or braided articles comprising fibres as aforesaid either alone or combination with other e.g. natural or synthetic organic fibres for a variety of applications including filtration or catalyst support, formation of composite materials and formation of textile products.
IPC Classes ?
- C22C 5/06 - Alloys based on silver
- C22C 5/08 - Alloys based on silver with copper as the next major constituent
- C22F 1/00 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- D04B 1/14 - Other fabrics or articles characterised primarily by the use of particular thread materials
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4.
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SILVER ALLOY
Application Number |
GB2006050150 |
Publication Number |
2007/007121 |
Status |
In Force |
Filing Date |
2006-06-12 |
Publication Date |
2007-01-18 |
Owner |
MIDDLESEX SILVER CO. LIMITED (United Kingdom)
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Inventor |
Johns, Peter, Gamon
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Abstract
A firestain and tarnish-resistant alloy of silver, copper and germanium contains more than 94.5 wt% to 95.5 wt% Ag, from 1.0 to 1.5 wt% Ge and the remainder, apart from up to 0.5wt% incidental ingredients (if any), impurities and boron in an amount effective to bring about grain refinement, copper, the weight ratio of Cu to Ge being from 2.5:1 to less than 3:1.
IPC Classes ?
- C22C 5/06 - Alloys based on silver
- C22C 5/08 - Alloys based on silver with copper as the next major constituent
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5.
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SILVER SOLDER OR BRAZING ALLOYS AND THEIR USE
Application Number |
GB2006050149 |
Publication Number |
2007/007120 |
Status |
In Force |
Filing Date |
2006-06-12 |
Publication Date |
2007-01-18 |
Owner |
MIDDLESEX SILVER CO. LIMITED (United Kingdom)
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Inventor |
Johns, Peter, Gamon
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Abstract
The present invention relates to silver solder or brazing alloys and to their use in making soldered joints in various grades of silver, particularly silversmithing grades. They alloys are silver solder or brazing alloy of the Ag-Cu-Zn family containing more than 7o wt % Ag and from 0.5 to 3 wt% Ge. They can exhibit an advantageous combination of colour, flowability and firestain or tarnish resistance.
IPC Classes ?
- B23K 35/30 - Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
- C22C 5/08 - Alloys based on silver with copper as the next major constituent
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6.
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SILVER-COPPER-GERMANIUM ALLOY MANUFACTURING
Application Number |
GB2006050116 |
Publication Number |
2006/123190 |
Status |
In Force |
Filing Date |
2006-05-19 |
Publication Date |
2006-11-23 |
Owner |
MIDDLESEX SILVER CO. LIMITED (United Kingdom)
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Inventor |
Johns, Peter, Gamon
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Abstract
Silver alloys containing copper and germanium e.g. about 1 wt% Ge and of very low copper content e.g. about 0.8 wt % Cu can be precipitation hardened to 65 HV or above, whereas alloys of similar copper content and not containing germanium remain soft. In an embodiment, a silver alloy comprises 92.5 - 97 wt% Ag, 1-4.5 wt% Cu, 0.4-4 wt% Zn, 0.8-1.5 wt% Ge, 0 to 0.2 wt% Si5 In or Sn and 0-0.2 wt% Mn, the balance being boron as grain refiner, incidental ingredients and impurities. The said alloy preferably comprises boron as grain refiner added as a boron hydride, e.g. sodium borohydride. A further group of alloys comprises a ternary alloy of silver, copper and germanium containing from more than 93.5 wt% to 95.5 wt% Ag, from 0.5 to 3 wt% Ge and the remainder, apart from incidental ingredients (if any), impurities and grain refiner, copper, the grain refiner being sodium borohydride or another boron hydride. Silicon-containing casting grain that gives rise to bright as-cast products is also disclosed. In a further embodiment, a zinc-containing silver alloy resistant to tarnish under severe conditions e.g. exposure to human sweat or French dressing comprises 1-5 wt% Zn, 0.7-3 wt% Cu, 0.1-3 wt% Ge, 0-0.3 wt% Mn, 0-0.25 wt% Si, B in an amount effective for grain refinement, up to 0.5 wt% incidental ingredients, the balance being Ag in an amount of 92.5-96 wt%, and impurities. A preferred manufacturing method giving an alloy with favourable physical properties involves melting together the ingredients, and incorporating boron by dispersing into molten silver alloy to form the whole or a precursor part of said alloy a compound selecting from alkyl boron compounds, boron hydrides, boron halides, boron-containing metal hydrides, boron- containing metal halides and mixtures thereof. The alloy is particularly suitable for castings which may be hardened in an oven e.g. at about 3000C for 30-45 min.
IPC Classes ?
- C22C 5/06 - Alloys based on silver
- C22F 1/14 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon
- B23K 35/30 - Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
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7.
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METHOD FOR ADDING BORON TO METAL ALLOYS
Application Number |
US2006014835 |
Publication Number |
2006/113847 |
Status |
In Force |
Filing Date |
2006-04-19 |
Publication Date |
2006-10-26 |
Owner |
- STERN LEACH COMPANY (USA)
- MIDDLESEX SILVER CO LMITED (United Kingdom)
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Inventor |
- Davis, Samuel, Albert
- Johns, Peter, Gamon
- Baker, Neil, Dalton
- Riskalla, John
- Carrano, Richard, V.
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Abstract
A method to grain refine and deoxidize a precious metal alloy or a master alloy includes the steps of (a) forming a precursor melt (10) consisting essentially of constituents of the precious metal alloy or master alloy and inevitable impurities; (b) dispersing (14) a compound selected from the group consisting of boron containing metal hydrides, boron containing metal fluorides and mixtures thereof throughout the precursor melt; and (c) solidifying (20) the boron containing precious melt alloy or master alloy. One suitable compound is solid sodium borohydride (sodium tetrahydroborate). To minimize evaporation of the boron on contact with the precursor alloy melt, the sodium 0 borohydride may be wrapped in a metal foil formed from constituents of the precious metal alloy or master alloy. The cast precious metal alloy or master alloy has been found to have a reduced number of hard spots and reduced silicon contamination when compared to conventional casting methods.
IPC Classes ?
- C22B 9/05 - Refining by treating with gases, e.g. gas flushing
- C22B 9/10 - General processes of refining or remelting of metalsApparatus for electroslag or arc remelting of metals with refining or fluxing agentsUse of materials therefor
- C22C 5/08 - Alloys based on silver with copper as the next major constituent
- C22C 5/02 - Alloys based on gold
- C22C 5/04 - Alloys based on a platinum group metal
- C22C 1/06 - Making non-ferrous alloys with the use of special agents for refining or deoxidising
- B22D 11/116 - Refining the metal
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