US3728366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid/liquid extraction of cobalt values
Assignee: Shell USA Inc
•
Filing: 1971-04-05
•
Granted: 1973-04-17
•
Expires: 1991-04-05
Abstract
Abstract Selective extraction of cobalt from alkaline aqueous solutions of its salts with organic solutions of lower diphenylphosphinocarboxylic acids and their oxides is disclosed.
Inventors
- 👤 M Michlmayr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:23
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B3/00; C22B3/20; C22B3/26; C22B3/38; C22B3/387; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
27 words
The process in accordance with claim 1 wherein the aqueous solution additionally contains a metal value selected from the group consisting of copper values and nickel values.
Claim 2
Dependent Claim
17 words
The process in accordance with claim 1 wherein x is an integer from 1 to 4 inclusive.
Claim 3
Dependent Claim
23 words
The process in accordance with claim 3 wherein the pH of the aqueous solution is in the range of from 7.5 to 10.0.
Claim 4
Dependent Claim
29 words
The process in accordance with claim 3 wherein the extracting agent is selected from the group consisting of diphenylphosphinoacetic acid, diphenylphosphinopropionic acid, diphenylphosphinobutyric acid, diphenylphosphinopentanoic acid and diphenylphosphinylacetic acid.
References Cited (Backward Citations)
US3477953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |