US2521152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mineral separation process
Assignee: Individual
•
Filing: 1947-07-17
•
Granted: 1950-09-05
•
Expires: 1967-07-17
Abstract
No abstract record available.
Inventors
- 👤 Nelson L Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:57
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/28; B03B5/30; B03B5/36; B03B5/42; B03B11/00; B03B2011/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
THE METHOD OF CLEANING COAL AND THE LIKE, WHICH CONSISTS IN SUCCESSIVELY CONFINING AND IMMERSING A GENERALLY CONTINOUS SUCCESSION OF SEPARATE, LOOSELY ASSEMBLED BATHCES OF SOLIDS IN A BATH, THE SPECFIC GRAVITY OF WHICH IS GREATER THAN THAT OF SOME AND LESS THAN THAT OF OTHER OF THE SOLIDS, MOVING AND IMPARTING RELATIVE LATERAL MOVEMENT TO THE SOLIDS WITHIN EACH CONFINED BATCH WHILE SO IMMERSED BY REVOLVING THE BATCHES DOWNWARDLY IN AN ARCUATE PATH ABOUT A SUBSTANTIALLY HORIZONTAL AXIS TO PERMIT THE LIGHTER SOLIDS TO RISE TO THE TOP AND THE HEAVIER SOLIDS TO SINK TO THE BOTTOM OF EACH BATCH SUCCESSIVELY IN SINK AND FLOAT SEPARATION WHILE MAINTAINING THE SOLIDS OF EACH CONFINED BATCH AGAINST ESCAPE FROM THE BATCH, THEREAFTER RELEASING THE SOLIDS OF EACH SEPARATE BATCH AT A POINT BELOW THE SURFACE OF THE BATH TO PERMIT FREE UPWARD FLOATING OF THE LIGHTER SOLIDS TO THE SURFACE OF THE BATH, AND SEPARATELY REMOVING THE FLOATING LIGHTER SOLIDS AND THE REMAINING HEAVIER SOLIDS FROM THE BATH.
Claim 2
Independent Claim
167 words
THE METHOD OF CLEANING COAL AND THE LIKE, WHICH CONSISTS IN SUCCESSIVELY CONFINING AND IMMERSING A GENERALLY CONTINOUS SUCCESSION OF SEPARATE, LOOSELY ASSEMBLED BATHCES OF SOLIDS IN A BATH, THE SPECFIC GRAVITY OF WHICH IS GREATER THAN THAT OF SOME AND LESS THAN THAT OF OTHER OF THE SOLIDS, MOVING AND IMPARTING RELATIVE LATERAL MOVEMENT TO THE SOLIDS WITHIN EACH CONFINED BATCH WHILE SO IMMERSED BY REVOLVING THE BATCHES DOWNWARDLY IN AN ARCUATE PATH ABOUT A SUBSTANTIALLY HORIZONTAL AXIS TO PERMIT THE LIGHTER SOLIDS TO RISE TO THE TOP AND THE HEAVIER SOLIDS TO SINK TO THE BOTTOM OF EACH BATCH SUCCESSIVELY IN SINK AND FLOAT SEPARATION WHILE MAINTAINING THE SOLIDS OF EACH CONFINED BATCH AGAINST ESCAPE FROM THE BATCH, THEREAFTER RELEASING THE SOLIDS OF EACH SEPARATE BATCH AT A POINT BELOW THE SURFACE OF THE BATH TO PERMIT FREE UPWARD FLOATING OF THE LIGHTER SOLIDS TO THE SURFACE OF THE BATH, AND SEPARATELY REMOVING THE FLOATING LIGHTER SOLIDS AND THE REMAINING HEAVIER SOLIDS FROM THE BATH.
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) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |