US3762911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining scrap especially of copper nickel alloy
Assignee: Vereinigte Deutsche Metallwerke AG
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Filing: 1971-05-14
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Granted: 1973-10-02
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Expires: 1991-05-14
Abstract
Abstract A method of refining scrap of a high-melting-point metal alloy, especially a copper-nickel alloy, in which the scrap is heated in vacuo to a temperature lower than the smelting point of the scrap, at which impurities, e.g. lead, tin and zinc, or compounds of these elements, especially their oxides, on the surface of the scrap have a vapor pressure sufficient to cause vaporization of the impurities. The thus purified metal may be smelted for further refining or alloying, or casting into ingots without further treatment.
Inventors
- 👤 Der Crone G Von
- 👤 H Fricke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:12
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/04; C22B1/00; C22B1/14; C22B1/24; C22B1/248; C22B7/00; C22B7/001; C22B7/004; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
14 words
The method defined in claim 1 wherein said high-melting-point metal is a copper-nickel alloy.
Claim 2
Dependent Claim
19 words
The method defined in claim 2 wherein said impurity metal is a lead-tin solder adherent to said copper-nickel alloy.
Claim 3
Dependent Claim
19 words
The method defined in claim 3, further comprising the step of oxidizing said impurity metal during the heating thereof.
Claim 4
Dependent Claim
32 words
The method defined in claim 4 wherein said scrap is heated in an oxygen-containing atmosphere produced by feeding air, oxygen-enriched air or oxygen into the region in which said scrap is heated.
Claim 5
Dependent Claim
23 words
The method defined in claim 4 wherein said impurity metal is oxidized at least in part by oxygen derived from oxidized copper-nickel alloy.
Claim 6
Dependent Claim
23 words
The method defined in claim 4, further comprising the step of smelting said scrap upon volatilization of the impurity metal without intervening cooling.
Claim 7
Dependent Claim
48 words
The method defined in claim 7 wherein said pressure ranges between 10 1 and 10 4 torr and the temperature ranges between 950*C and 1250*C during volatilization of said impurity metal, said scrap being heated to volatilize said impurity metal over a period up to about 1 hour.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |