US2591830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of resins from coal
Assignee: Combined Metals Reduction Co
•
Filing: 1946-07-25
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Granted: 1952-04-08
•
Expires: 1966-07-25
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
2026-10-29 02:36
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/1412; B03D1/1443; B03D1/145; B03D1/1456; B03D1/1462; B03D1/16; B03D1/18; B03D1/24; B03D1/247; C; C09; C09F; C09F1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
THE METHOD OF WASHING RAW SLIMY RESIN BEARING COAL TO PREPARE A CLEAN COAL PRODUCT FREE FROM COAL SLIMES, AND SIMULTANEOUSLY RECOVERING THE RESIN CONTENT OF THE COAL IN THE FORM OF A RESIN CONCENTRATE, WHICH COMPRISES FLOWING A STREAM OF AN AQUEOUS PULP OF THE RAW COAL TO A SUBSTANTIALLY QUIESCENT BODY THEREOF, INCOPORATING A FROTHING AGENT IN THE FLOWING STREAM OF COAL PULP, AERATING THE PULP, HOLDING THE PULP IN SAID SUBSTANTIALLY QUIESCENT BODY FOR A SUBSTANTIAL PERIOD OF TIME WITH THE RESULT THAT A RESIN CONCENTRATE FROTH COLLECTS AT THE SURFACE OF SAID BODY WHILE FINE COAL PARTICLES SETTLE FROM THE COAL SLIMES TO THE BOTTOM THEREOF, WITHDRAWING A FINE COAL PRODUCT SUBSTANTIALLY FREE OF SLIMES FROM THE LOWER PORTION OF SAID BODY, SKIMMING THE FROTH OF RESIN CONCENTRATE FROM THE SURFACE OF SAID BODY, AND SEPARATELY WITHDRAWING THE BULK OF THE AQUEOUS PHASE OF THE PULP WITH THE COAL SLIMES SUSPENDED THEREIN FROM SAID BODY AT A LEVEL JUST BELOW THE LEVEL AT WHICH THE FROTH IS SKIMMED.
Claim 2
Independent Claim
172 words
THE METHOD OF WASHING RAW SLIMY RESIN BEARING COAL TO PREPARE A CLEAN COAL PRODUCT FREE FROM COAL SLIMES, AND SIMULTANEOUSLY RECOVERING THE RESIN CONTENT OF THE COAL IN THE FORM OF A RESIN CONCENTRATE, WHICH COMPRISES FLOWING A STREAM OF AN AQUEOUS PULP OF THE RAW COAL TO A SUBSTANTIALLY QUIESCENT BODY THEREOF, INCOPORATING A FROTHING AGENT IN THE FLOWING STREAM OF COAL PULP, AERATING THE PULP, HOLDING THE PULP IN SAID SUBSTANTIALLY QUIESCENT BODY FOR A SUBSTANTIAL PERIOD OF TIME WITH THE RESULT THAT A RESIN CONCENTRATE FROTH COLLECTS AT THE SURFACE OF SAID BODY WHILE FINE COAL PARTICLES SETTLE FROM THE COAL SLIMES TO THE BOTTOM THEREOF, WITHDRAWING A FINE COAL PRODUCT SUBSTANTIALLY FREE OF SLIMES FROM THE LOWER PORTION OF SAID BODY, SKIMMING THE FROTH OF RESIN CONCENTRATE FROM THE SURFACE OF SAID BODY, AND SEPARATELY WITHDRAWING THE BULK OF THE AQUEOUS PHASE OF THE PULP WITH THE COAL SLIMES SUSPENDED THEREIN FROM SAID BODY AT A LEVEL JUST BELOW THE LEVEL AT WHICH THE FROTH IS SKIMMED.
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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) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |