US3620714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing noble metal alloy powders
Assignee: EIDP Inc
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Filing: 1970-02-26
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Granted: 1971-11-16
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Expires: 1990-02-26
Abstract
Abstract A method of preparing alloy powders which exhibit low, if any, catalytic activity. Acid chloride solutions of noble metals are prepared; the metal alloy is precipitated as an alloy-ammonia complex and then reduced to yield a relatively coarse noble metal alloy precipitate powder. The important process parameters include the particular chemical reagents utilized, pH control and the rates of precipitation and reduction.
Inventors
- 👤 Oliver A Short
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:24
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
A process in accordance with claim 1 wherein the noble metal chlorides are gold chloride and palladium chloride, and the powder produced is a gold/palladium alloy.
Claim 2
Dependent Claim
28 words
A process in accordance with claim 1 wherein the noble metal chlorides are gold chloride, palladium chloride and platinum chloride, and the powder produced is a gold/palladium/platinum alloy.
Claim 3
Dependent Claim
26 words
A process in accordance with claim 1 wherein the noble metal chlorides are gold chloride and platinum chloride, and the powder produced is a gold/palladium alloy.
Claim 4
Dependent Claim
26 words
A process in accordance with claim 1 wherein the pH is also raised to 10-11 after the reduction step (3) by the addition of ammonium hydroxide.
Claim 5
Dependent Claim
20 words
A process in accordance with claim 5 wherein the ammonium hydroxide is rapidly added to the noble metal chloride solution.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |