US4165983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jewelry alloys
Assignee: Johnson Matthey PLC
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Filing: 1978-02-23
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Granted: 1979-08-28
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Expires: 1998-02-23
Abstract
Abstract An alloy suitable for use in the fabrication of jewelry containing at least 95% by weight platinum and 1.5 to 3.5% by weight gallium, the balance being at least one of indium, gold, palladium, silver, copper, cobalt, nickel, ruthenium, iridium and rhodium. A Ga/Au/Pt alloy is preferred for ornamental application, and a Ga/In/Pt possibly including gold, silver or palladium is preferred for use in the manufacture of springs and clasps. Alloys are described which comply with hallmarking requirements but yet casting may be effected more easily than with pure platinum.
Inventors
- 👤 Alan A. Bourne
- 👤 Arthur G. Knapton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:26
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
49 words
An alloy suitable for use in the fabrication of jewelery consisting essentially of, apart from impurities, at least 95% by weight platinum, and 1.5 to 3.5% by weight gallium, the balance being at least one of the metals indium, gold, palladium, silver, copper, cobalt, nickel, ruthenium, iridium and rhodium.
Claim 2
Dependent Claim
49 words
An alloy suitable for use in the fabrication of jewelery consisting essentially of, apart from impurities, at least 95% by weight platinum, and 1.5 to 3.5% by weight gallium, the balance being at least one of the metals indium, gold, palladium, silver, copper, cobalt, nickel, ruthenium, iridium and rhodium.
Claim 3
Dependent Claim
17 words
An alloy according to claim 1 wherein the gallium content ranges from 2 to 3% by weight.
Claim 4
Dependent Claim
24 words
An alloy according to claim 2 wherein the balance is made up by gold in an amount of from 2 to 3% by weight.
Claim 5
Dependent Claim
20 words
An alloy according to claim 3 containing 2% by weight gallium, 3% by weight gold and 95% by weight platinum.
Claim 6
Dependent Claim
37 words
An alloy according to claim 1 containing 1.5 to 3.5% by weight gallium, 0.5 to 3.5% by weight indium and the balance, if any, being made up of one or more of the said metals excluding indium.
Claim 7
Dependent Claim
28 words
An alloy according to claim 5 wherein the gallium content ranges from 2.5 to 3.0% by weight and the indium content ranges from 1.0 to 1.5% by weight.
Claim 8
Dependent Claim
17 words
An alloy according to claim 6 wherein the balance is made up by gold, silver or palladium.
Claim 9
Dependent Claim
14 words
An alloy according to claim 1 modified in that it contains a deoxidising agent.
Claim 10
Dependent Claim
22 words
An alloy according to claim 8 wherein the deoxidising agent is yttrium and is present in any amount of 0.1% by weight.
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) | 1982-08-27 | 1983-02-26 | 1983-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-27 | 1987-02-26 | 1987-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-27 | 1991-02-26 | 1991-08-28 | $7700.00 | Window Closed / Lapsed |