US2506301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of resins from coal
Assignee: Combined Metals Reduction Co
•
Filing: 1946-06-17
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Granted: 1950-05-02
•
Expires: 1966-06-17
Abstract
No abstract record available.
Inventors
- 👤 Klepetko Ernest
- 👤 Philip De B Kaye
- 👤 Jr Lester J Hartzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:36
CPC Classifications
C; C09; C09F; C09F1/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
IN A PROCESS FOR THE RECOVERY OF A RESIN FROM A RESIN-BEARING COAL, INVOLVING CRUSHING THE COAL, SUBJECTING THE CRUSHED COAL TO A FLOTATION OPERATION TO PREPARE A RESIN CONCENTRATE, LEACHING THE CONCENTRATE WITH A SOLVENT FOR THE RESIN, AND SEPARATING THE RESULTING RESIN SOLUTION FROM THE INSOLUBLE CONSTITUENTS OF THE CONCENTRATE, THE IMPROVEMENT WHICH COMPRISES CRUSHING THE COAL NO MORE THAN NECESSARY TO ENABLE THE CRUSHED PRODDUCT TO PASS A 6-MESH SCREEN PRIOR TO SUBJECTING IT TO THE FLOTATION OPERATION TO PRODUCE THE RESIN CONCENTRATE, WHEREBY WHEN THE CONCENTRATE IS LEACHED THE RESIN SOLUTION THEREBY OBTAINED IS READILY SEPARATED FILTRATION FROM THE INSOLUBLE CONSTITUENTS OF THE CONCENTRATE.
References Cited (Backward Citations)
US1773997A
Cited
US2364090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-01 | 1953-10-31 | 1954-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-01 | 1957-10-31 | 1958-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-01 | 1961-10-31 | 1962-05-02 | $7700.00 | Window Closed / Lapsed |