Patent US3640684A successfully refreshed from Google Patents.
US3640684A
Expired / Lapsed
US
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Preparation of cuprous oxide
Assignee: Universal Oil Products Co
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Filing: 1970-01-13
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Granted: 1972-02-08
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Expires: 1990-01-13
Abstract
Abstract Preparing cuprous oxide from an aqueous cuproammonium solution containing cuprous and cupric ions by contacting the solution with an ion exchange resin in which cupric ions are retained and cuprous ions are not. The raffinate passing through the ion exchange resin is withdrawn and heated to evolve ammonium ions and to form cuprous oxide. The cuprous oxide then is recovered by filtering and drying.
Inventors
- 👤 Lawrence C Klein
- 👤 Laurence G Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:06
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
The method of claim 1 in which the cupric-ammonium solution used for said leaching is an oxidized copper ammonium carbonate solution.
Claim 2
Dependent Claim
22 words
The method of claim 1 in which said ion exchange resin is a polyacrylic carboxylated weak cation exchangE resin in ammonium form.
Claim 3
Dependent Claim
37 words
The method of claim 1 in which the cuprous oxide product is filtered to recover the cuprous oxide which is dried in the absence of oxygen at a temperature of from about 100* to about 250* F.
Claim 4
Dependent Claim
31 words
The method of claim 1 in which the cuprous oxide product is cooled to about 40*-100* F., filtered in the presence of air, and then dried in the absence of oxygen.
Claim 5
Dependent Claim
34 words
The method of claim 1 in which the retained cupric ions are eluted with a solution of ammonium carbonate and excess ammonia, and the eluted solution is used to prepare the first-mentioned cupro-ammonium solution.
References Cited (Backward Citations)
US2898185A
Cited
US3492115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |