US3140255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration apparatus and method
Assignee: Denver Equipment Co
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Filing: 1961-08-23
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Granted: 1964-07-07
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Expires: 1981-08-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Daman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:01
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/16; B03D1/20; B03D1/1412; B03D1/1418; B03D1/24; B03D1/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
THE FROTH FLOTATION PROCESS, WHICH COMPRISES TREATING A BODY OF CONDITIONED PULP, SUBJECT TO CONTINUOUS FEED AND DISCHARGE, IN A PROGRESSIVE FLOW THROUGH AN ELONGATED CONFINED ZONE WITH THE SURFACE OF THE PULP MAINTAINED AT A COMMON LEVEL THROUGHOUT SAID ZONE, SUBJECTING PULP IN THE LOWER PORTION OF SAID BODY TO A SUCCESSION OF AT LEAST TWO ADJOINING STAGES OF CONTRIFUGAL AGITATION AND AERATION WITH A PORTION OF THE PULP DISCHARGE FROM ONE STAGE CONVERGING IN OPPOSITION TO A PORTION OF THE PULP DISCHARGE FROM AN ADJOINING STAGE, WITHDRAWING A PORTION OF THE INTERMINGLING DISCHARGE FROM SAID AGITATION AND AERATION STAGES UPWARDLY THROUGH AN UPPER SUPERPOSED CONFINED ZONE UNDER THE ELEVATING ACTION OF A LARGE VOLUME OF AERATING GAS INTRODUCED IN FINE, UPWARDLY-DIRECTED STREAMS AT THE BOTTOM OF SAID SUPERPOSED ZONE, AND DISCHARGING THE ENTRAINED PULP ALONG A NARROW PATH ON THE SURFACE OF SAID PULP.
Claim 2
Dependent Claim
146 words
THE FROTH FLOTATION PROCESS, WHICH COMPRISES TREATING A BODY OF CONDITIONED PULP, SUBJECT TO CONTINUOUS FEED AND DISCHARGE, IN A PROGRESSIVE FLOW THROUGH AN ELONGATED CONFINED ZONE WITH THE SURFACE OF THE PULP MAINTAINED AT A COMMON LEVEL THROUGHOUT SAID ZONE, SUBJECTING PULP IN THE LOWER PORTION OF SAID BODY TO A SUCCESSION OF AT LEAST TWO ADJOINING STAGES OF CONTRIFUGAL AGITATION AND AERATION WITH A PORTION OF THE PULP DISCHARGE FROM ONE STAGE CONVERGING IN OPPOSITION TO A PORTION OF THE PULP DISCHARGE FROM AN ADJOINING STAGE, WITHDRAWING A PORTION OF THE INTERMINGLING DISCHARGE FROM SAID AGITATION AND AERATION STAGES UPWARDLY THROUGH AN UPPER SUPERPOSED CONFINED ZONE UNDER THE ELEVATING ACTION OF A LARGE VOLUME OF AERATING GAS INTRODUCED IN FINE, UPWARDLY-DIRECTED STREAMS AT THE BOTTOM OF SAID SUPERPOSED ZONE, AND DISCHARGING THE ENTRAINED PULP ALONG A NARROW PATH ON THE SURFACE OF SAID PULP.
References Cited (Backward Citations)
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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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |