Patent EP0273710A2 successfully refreshed from Google Patents.
US3865718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frothers for the flotation of sulfidic ores
Assignee: Dow Chemical Co
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Filing: 1972-12-07
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Granted: 1975-02-11
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Expires: 1992-12-07
Abstract
Abstract A process involving the use of a new and improved class of frothing agents in the froth flotation of ores such as the sulfide ores of copper, molybdenum, lead, nickel and zinc, as well as for separating coal fines by flotation. The class comprises the non-hydroxylated ether derivatives of dialkylene glycols such as ethylene glycol and propylene glycol. Especially good results are obtained when these frothers are employed in the treatment of complex copper-molybdenum ores.
Inventors
- 👤 Elmer C Tveter
- 👤 Guy H Harris
- 👤 Lowell B Lindy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:35
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D1/0043; B03D1/012; B03D2201/00; B03D2201/02; B03D2201/04; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
52 words
THE METHOD WHICH COMPRISES SUBJECTING AN AQUEOUS PULP OF A SULFIDIC ORE OF ONE OR MORE OF THE METALS LEAD, ZINC, COPPER, MOLYBDENUM, NICKEL, COBALT, ANTIMONY, SILVER, MERCURY, GOLD, CADMIUM AND ARSENIC TO FROTH FLOTATION IN THE PRESENCE OF A COLLECTOR AND ONE OR MOER ORGANIC FROTHING AGENTS CORRESPONDING TO THE FORMULA
Claim 2
Independent Claim
52 words
THE METHOD WHICH COMPRISES SUBJECTING AN AQUEOUS PULP OF A SULFIDIC ORE OF ONE OR MORE OF THE METALS LEAD, ZINC, COPPER, MOLYBDENUM, NICKEL, COBALT, ANTIMONY, SILVER, MERCURY, GOLD, CADMIUM AND ARSENIC TO FROTH FLOTATION IN THE PRESENCE OF A COLLECTOR AND ONE OR MOER ORGANIC FROTHING AGENTS CORRESPONDING TO THE FORMULA
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein, in the formula, R is t-butyl.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein, in the formula, R is methyl.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the frothing agent is diethylene glycol methyl, t-butyl ether.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein the frothing agent is diethylene glycol di-t-butyl ether.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the frothing agent is diethylene glycol ethyl, t-butyl ether.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |