Patent US2758714A successfully refreshed from Google Patents.
US2758714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of minerals
Assignee: Smith-Douglas Co Inc
•
Filing: 1954-08-25
•
Granted: 1956-08-14
•
Expires: 1974-08-25
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:28
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/24; B03D1/26; B03D1/1412; B03D1/1493; B03D1/245
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A FLOTATION APPARATUS COMPRISING A TANK OF SUBSTANTIAL DEPTH HAVING NEAR THE TOP THEREOF PULP FEEDING MEANS AND FROTH OVERFLOW MEANS, PULP DISCHARGE MEANS NEAR THE BOTTOM OF SAID TANK, A HYDRAULIC COMPARTMENT COMMUNICATING THROUGH A POROUS MEDIUM WITH THE BOTTOM OF SAID TANK, THE COMPARTMENT, POROUS MEDIUM AND BOTTOM OF THE TANK BEING OF SUBSTANTIALLY THE SAME CROSS-SECTIONAL AREA, MEANS FOR INTRODUCING WATER INTO SAID COMPARTMENT UNDER SUFFICIENT PRESSURE TO FORCE WATER THROUGH SAID POROUS MEDIUM INTO SAID TANK, AND A PLURALITY OF GROUPS OF HORIZONTALY DISPOSED AIR-DIFFUSERS MOUNTED WITHIN THE TANK IN SUPERPOSED AND VERTICALLY SPACED POSITIONS.
Claim 2
Dependent Claim
99 words
A FLOTATION APPARATUS COMPRISING A TANK OF SUBSTANTIAL DEPTH HAVING NEAR THE TOP THEREOF PULP FEEDING MEANS AND FROTH OVERFLOW MEANS, PULP DISCHARGE MEANS NEAR THE BOTTOM OF SAID TANK, A HYDRAULIC COMPARTMENT COMMUNICATING THROUGH A POROUS MEDIUM WITH THE BOTTOM OF SAID TANK, THE COMPARTMENT, POROUS MEDIUM AND BOTTOM OF THE TANK BEING OF SUBSTANTIALLY THE SAME CROSS-SECTIONAL AREA, MEANS FOR INTRODUCING WATER INTO SAID COMPARTMENT UNDER SUFFICIENT PRESSURE TO FORCE WATER THROUGH SAID POROUS MEDIUM INTO SAID TANK, AND A PLURALITY OF GROUPS OF HORIZONTALY DISPOSED AIR-DIFFUSERS MOUNTED WITHIN THE TANK IN SUPERPOSED AND VERTICALLY SPACED POSITIONS.
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) | 1959-08-14 | 1960-02-13 | 1960-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-14 | 1964-02-13 | 1964-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-14 | 1968-02-13 | 1968-08-14 | $7700.00 | Window Closed / Lapsed |