US4141691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of water soluble polymers in coal flotation circuits
Assignee: ECC SPECIALTY CHEMICALS Inc
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Filing: 1977-12-12
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Granted: 1979-02-27
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Expires: 1997-12-12
Abstract
Abstract {PG,1 Use of cationic water soluble polymers in coal flotation circuits to improve the recovery of clean coal and reduce the ash content.
Inventors
- 👤 Joseph M. Antonetti
- 👤 Glen F. Snow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:13
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/016; C; C10; C10L; C10L9/00; B03D1/01; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
42 words
A process for improving the recovery of clean coal from flotation circuits which comprises adding an effective amount of a water soluble cationic polymer to the coal being processed to decrease the amount of clay in the aqueous coal suspension being treated.
Claim 2
Dependent Claim
42 words
A process for improving the recovery of clean coal from flotation circuits which comprises adding an effective amount of a water soluble cationic polymer to the coal being processed to decrease the amount of clay in the aqueous coal suspension being treated.
Claim 3
Dependent Claim
26 words
A process as in claim 1 wherein the effective amount is at least 0.025 pounds per ton based on the weight of the dry flotation feed.
Claim 4
Dependent Claim
14 words
A process as in claim 1 wherein the polymer is poly(dimethyl diallyl ammonium chloride).
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) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |