US3958983A
Expired / Lapsed
US
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Decomposition of chalcopyrite
Assignee: United States Department of the Interior
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Filing: 1975-06-19
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Granted: 1976-05-25
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Expires: 1995-06-19
Abstract
Abstract Chalcopyrite ore or concentrate is decomposed by reacting with an aqueous acid solution of a transition metal ion in a lower valence state, the metal being from the group consisting of chromium, vanadium and titanium.
Inventors
- 👤 Walter Lyman Staker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:40
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B15/0065; C22B15/0067; C22B15/0071; C22B15/0069; C22B15/0084; C22B15/0089; C22B3/00; C22B3/04; C22B3/045; C22B5/00; C22B5/02; C22B5/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
42 words
A process for decomposition of chalcopyrite ore or concentrate comprising reacting the ore or concentrate with an aqueous acid solution of a transition metal ion in a lower valence state, said metal being from the group consisting of chromium, vanadium and titanium.
Claim 2
Dependent Claim
42 words
A process for decomposition of chalcopyrite ore or concentrate comprising reacting the ore or concentrate with an aqueous acid solution of a transition metal ion in a lower valence state, said metal being from the group consisting of chromium, vanadium and titanium.
Claim 3
Dependent Claim
16 words
The process of claim 1 in which the aqueous acid solution is a hydrochloric acid solution.
Claim 4
Dependent Claim
16 words
The process of claim 1 in which the aqueous acid solution is a sulfuric acid solution.
Claim 5
Dependent Claim
16 words
The process of claim 1 in which the transition metal ion has a valence of plus-2.
Claim 6
Dependent Claim
37 words
The process of claim 1 in which the lower valence state of the transition metal ion is attained by reduction of the transition metal ion in a higher valence state by means of a metallic reducing agent.
Claim 7
Dependent Claim
24 words
The process of claim 1 in which the lower valence state of the transition metal ion is attained by means of an electric current.
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) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |