Patent US4644674A successfully refreshed from Google Patents.
US4644674A
Expired / Lapsed
US
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Alloy for coins
Assignee: Deputy Master and Controller Royal Mint
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Filing: 1984-02-27
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Granted: 1987-02-24
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Expires: 2004-02-27
Abstract
Abstract A coin, a coin blank or metal strip for the production of a coin or a coin blank having as its surface a copper based alloy containing between 15% and 30% (by wt) zinc, between 2% and 7% (by wt) tin and, optionally, between 2% and 7% (by wt) nickel. The alloy is gold-colored, tarnish resistant, fabricable and wear resistant.
Inventors
- 👤 George R. Burrows
- 👤 Ian R. Scholes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:15
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/04; A; A44; A44C; A44C21/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12903
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
77 words
A coin wherein at least the surface of the coin is made of a copper-based alloy consisting essentially of from 20% to 30% (by wt) zinc, from 2% to 7% (by wt) tin, and up to 7% (by wt) nickel, the balance being copper apart from incidental impurities, said alloy being gold-colored, tarnish-resistant, fabricable, and wear-resistant, provided that when the alloy consists essentially of copper, zinc and tin, the alloy contains at least 3.5% (by wt) tin.
Claim 2
Dependent Claim
77 words
A coin wherein at least the surface of the coin is made of a copper-based alloy consisting essentially of from 20% to 30% (by wt) zinc, from 2% to 7% (by wt) tin, and up to 7% (by wt) nickel, the balance being copper apart from incidental impurities, said alloy being gold-colored, tarnish-resistant, fabricable, and wear-resistant, provided that when the alloy consists essentially of copper, zinc and tin, the alloy contains at least 3.5% (by wt) tin.
Claim 3
Dependent Claim
19 words
A coin according to claim 1 wherein the copper based alloy contains from 20% to 25% (by wt) zinc.
Claim 4
Dependent Claim
19 words
A coin according to claim 1 wherein the copper based alloy contains from 3% to 6% (by wt) tin.
Claim 5
Dependent Claim
19 words
A coin according to claim 3 wherein the copper based alloy contains from 4.5% to 5.5% (by wt) tin.
Claim 6
Dependent Claim
19 words
A coin according to claim 1 wherein the copper based alloy contains from 2% to 7% (by wt) nickel.
Claim 7
Dependent Claim
21 words
A coin according to claim 1 wherein the copper based alloy contains 20% (by wt) zinc and 5% (by wt) tin.
Claim 8
Dependent Claim
25 words
A coin according to claim 5 wherein the copper based alloy contains 25% (by wt) zinc, 5% (by wt) tin and 5% (by wt) nickel.
Claim 9
Dependent Claim
25 words
A coin according to claim 5 wherein the copper based alloy contains 20% (by wt) zinc, 4% (by wt) tin and 2% (by wt) nickel.
Claim 10
Dependent Claim
25 words
A coin according to claim 5 wherein the copper based alloy contains 20% (by wt) zinc, 4% (by wt) tin and 4% (by wt) nickel.
Claim 11
Dependent Claim
25 words
A coin according to claim 5 wherein the copper based alloy contains 20% (by wt) zinc, 5% (by wt) tin and 2% (by wt) nickel.
Claim 12
Dependent Claim
25 words
A coin according to claim 5 wherein the copper based alloy contains 25% (by wt) zinc, 3% (by wt) tin and 3% (by wt) nickel.
Claim 13
Dependent Claim
25 words
A coin according to claim 5 wherein the copper based alloy contains 25% (by wt) zinc, 3% (by wt) tin and 5% (by wt) nickel.
Claim 14
Dependent Claim
25 words
A coin according to claim 5 wherein the copper based alloy contains 25% (by wt) zinc, 5% (by wt) tin and 3% (by wt) nickel.
Claim 15
Dependent Claim
25 words
A coin according to claim 5 wherein the copper based alloy contains 25% (by wt) zinc, 5% (by wt) tin and 5% (by wt) nickel.
Claim 16
Dependent Claim
50 words
A coin wherein at least the surface of the coin is made of a copper-based alloy consisting essentially of from 20% to 30% (by wt) zinc and from 3.5% to 7% (by wt) tin, the balance being copper apart from incidental impurities, said alloy being gold-colored, tarnish-resistant, fabricable and wear-resistant.
Claim 17
Dependent Claim
50 words
A coin wherein at least the surface of the coin is made of a copper-based alloy consisting essentially of from 20% to 30% (by wt) zinc and from 3.5% to 7% (by wt) tin, the balance being copper apart from incidental impurities, said alloy being gold-colored, tarnish-resistant, fabricable and wear-resistant.
Claim 18
Dependent Claim
57 words
A coin wherein at least the surface of the coin is made of a copper-based alloy consisting essentially of from 20% to 30% (by wt) zinc, from 3.5% to 7% (by wt) tin, and from 2% to 7% (by wt) nickel, the balance being copper apart from incidental impurities, said alloy being gold-colored, tarnish-resistant, fabricable and wear-resistant.
Claim 19
Dependent Claim
57 words
A coin wherein at least the surface of the coin is made of a copper-based alloy consisting essentially of from 20% to 30% (by wt) zinc, from 3.5% to 7% (by wt) tin, and from 2% to 7% (by wt) nickel, the balance being copper apart from incidental impurities, said alloy being gold-colored, tarnish-resistant, fabricable and wear-resistant.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |