Patent US2713477A successfully refreshed from Google Patents.
US2713477A
Expired / Lapsed
US
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Dual aerating apparatus and method
Assignee: Mining Process and Patent Co
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Filing: 1952-04-07
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Granted: 1955-07-19
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Expires: 1972-04-07
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Daman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:43
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/16; B03D1/02; B03D1/028; B03D1/1406; B03D1/1412; B03D1/1493; B03D1/1443; B03D1/1462
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
APPARATUS FOR AGITATING AND AERATING SOLIDS IN LIQUIDS, COMPRISING A TANK FOR PULP HAVING A FEED INLET AND A DISCHARGE OUTLET DETERMINING A LIQUID LEVEL THEREIN, A HOLLOW SHAFT JOURNALED FOR ROTATION IN THE TANK AND HAVING ITS LOWER END SPACED FROM THE BOTTOM OF SAID TANK, AT LEAST TWO IMPELLER MEMBERS MOUNTED ON SAID SHAFT FOR CONJOINT ROTATION AT DIFFERENT ELEVATION IN THE PULP BODY, A STATIONARY ENCLOSURE OVERHANGING AN UPPER IMPELLER AND HAVING A CENTRAL OPENING FOR RECIRCULATION OF PULP THROUGH THE SPACE BETWEEN SAID IMPELLER AND ITS ENCLOSURE, THERE BEING A BOTTOM OPENING FOR DELIVERY OF PULP TO THE LOWER IMPELLER UNDER ITS PUMPING INFLUENCE, THERE BEING VERTICALLY SPACED OPENINGS IN THE SHAFT FOR DISCHARGING AN AERATING GAS INTO THE PATH OF ROTATION OF EACH IMPELLER, MEANS FOR DELIVERING GAS UNDER PRESSURE THROUGH SAID HOLLOW SHAFT, AND MEANS FOR ROTATING SAID IMPELLER MEMBERS.
Claim 2
Dependent Claim
146 words
APPARATUS FOR AGITATING AND AERATING SOLIDS IN LIQUIDS, COMPRISING A TANK FOR PULP HAVING A FEED INLET AND A DISCHARGE OUTLET DETERMINING A LIQUID LEVEL THEREIN, A HOLLOW SHAFT JOURNALED FOR ROTATION IN THE TANK AND HAVING ITS LOWER END SPACED FROM THE BOTTOM OF SAID TANK, AT LEAST TWO IMPELLER MEMBERS MOUNTED ON SAID SHAFT FOR CONJOINT ROTATION AT DIFFERENT ELEVATION IN THE PULP BODY, A STATIONARY ENCLOSURE OVERHANGING AN UPPER IMPELLER AND HAVING A CENTRAL OPENING FOR RECIRCULATION OF PULP THROUGH THE SPACE BETWEEN SAID IMPELLER AND ITS ENCLOSURE, THERE BEING A BOTTOM OPENING FOR DELIVERY OF PULP TO THE LOWER IMPELLER UNDER ITS PUMPING INFLUENCE, THERE BEING VERTICALLY SPACED OPENINGS IN THE SHAFT FOR DISCHARGING AN AERATING GAS INTO THE PATH OF ROTATION OF EACH IMPELLER, MEANS FOR DELIVERING GAS UNDER PRESSURE THROUGH SAID HOLLOW SHAFT, AND MEANS FOR ROTATING SAID IMPELLER MEMBERS.
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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) | 1958-07-18 | 1959-01-17 | 1959-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-18 | 1963-01-17 | 1963-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-18 | 1967-01-17 | 1967-07-19 | $7700.00 | Window Closed / Lapsed |