US3079331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of recovering coal fines
Assignee: Wyeth Holdings LLC
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Filing: 1959-08-27
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Granted: 1963-02-26
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Expires: 1979-08-27
Abstract
No abstract record available.
Inventors
- 👤 Elmer W Gieseke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:43
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/016; B03D1/01; B03D1/012; B03D2201/00; B03D2201/002; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A PROCESS OF RECOVERING FLOATING COAL FINES FROM AQUEOUS SLLURRIES TOPPED WITH COAL FINE-CONTAINING-FROTHS WHICH COMPRISES THE SUCCESSIVE STEPS OF (1) ADDING TO SAID SLURRIES ABOUT 2.5 TO 10 PARTS PER 1, 000, 000 OF A DEFOAMING REAGENT ESSENTIALLY COMPRISING A MIXTURE OF 70% CRUDE CALCIUM LINGIN SULFONATE, 29. 4% CORN DEXTRIN AND 0.6% SULFOANTED NIGROSINE; AND (2) TREATING THE RESULTING DEFOAMED COAL FINE-CONTAINING-SLURRY WITH A FLOCCULATING AGENT ESSENTIALLY COMPRISING ONE PART OF POLYACRYLAMIDE OF ABOUT 2, 000, 000 MOLECULAR WEIGHT AND 10 PARTS OF PREGELATINIZED STARCH.
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) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |