US3827557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of copper sulfide ore flotation
Assignee: Stepan Co
•
Filing: 1971-05-17
•
Granted: 1974-08-06
•
Expires: 1991-05-17
Abstract
Abstract A novel flotation promoter used in the concentration of copper bearing ores for the efficient selective flotation of copper values, including chalcopyrite, with suppression of iron pyrites; the promoter comprising a sodium sulfate of an aliphatic hydrocarbon having a carbon chain in excess of 12 carbons and chemically combined with at least one mole of the C2-C3 alkylene oxides.
Inventors
- 👤 E Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:24
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
15 words
The method of claim 1 wherein the amount of flotation promoter is about 0.02 lb./ton.
Claim 2
Dependent Claim
15 words
The method of claim 1 wherein collectors are used in combination with said flotation promoter.
Claim 3
Dependent Claim
54 words
A flotation promoter for selective water flotation of thin, finely ground, copper-bearing sulfide ores and suppression of iron pyrites therein, consisting essentially of an aliphatic hydrocarbon sodium sulfate having a C16-C18 carbon chain chemically combined with at least one mol of ethylene oxide and chemcially combined with at least one mol of propylene oxide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |