US2753045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of minerals
Assignee: SMITH DOUGLASS CO Inc
•
Filing: 1953-11-25
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Granted: 1956-07-03
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Expires: 1973-11-25
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:06
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/24; B03D1/26; B01; B01D; B01D21/00; B01D21/26; B03D1/1443; B03D1/145; B03D1/1456; B03D1/245
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
THE IMPROVEMENT IN THE CONCENTRATION OF MINERALS BY PNEUMATIC FLOATION WHICH COMPRISES FLOWING AN AQUEOUS PULP OF THE MINERAL IN A BODY OF RELATIVELY SHALLOW DEPTH THROUGH AN ELONGATED AND SUBSTANTIALLY HORIZONTAL TROUGH HAVING A POROUS BOTTOM, FORCING WATER UPWARDLY THROUGH SAID POROUS BOTTOM AND INTO AND OVER THE ENTIRE AREA OF THE BOTTOM OF THE FLOWING PULP, AND INTRODUCING AIR INTO THE FLOWING PULP CLOSE TO BUT ABOVE SAID POROUS BOTTOM.
Claim 2
Dependent Claim
72 words
THE IMPROVEMENT IN THE CONCENTRATION OF MINERALS BY PNEUMATIC FLOATION WHICH COMPRISES FLOWING AN AQUEOUS PULP OF THE MINERAL IN A BODY OF RELATIVELY SHALLOW DEPTH THROUGH AN ELONGATED AND SUBSTANTIALLY HORIZONTAL TROUGH HAVING A POROUS BOTTOM, FORCING WATER UPWARDLY THROUGH SAID POROUS BOTTOM AND INTO AND OVER THE ENTIRE AREA OF THE BOTTOM OF THE FLOWING PULP, AND INTRODUCING AIR INTO THE FLOWING PULP CLOSE TO BUT ABOVE SAID POROUS BOTTOM.
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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) | 1959-07-03 | 1960-01-02 | 1960-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-03 | 1964-01-02 | 1964-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-03 | 1968-01-02 | 1968-07-03 | $7700.00 | Window Closed / Lapsed |