US2628894A
Expired / Lapsed
US
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Countercurrent extraction method and apparatus
Assignee: Individual
•
Filing: 1951-02-28
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Granted: 1953-02-17
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Expires: 1971-02-28
Abstract
No abstract record available.
Inventors
- 👤 George J Langmyhr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:04
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/16; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0426; B01D11/043; B01D11/0484
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
A FLUID CONTACTING TOWER COMPRISING A CLOSED CYLINDRICAL CONTAINER MOUNTED WITH THE AXIS THEREOF VERTICAL, A HELICOID MOUNTED THEREIN COAXIAL THEREWITH HAVING THE OUTER PERIPHERAL EDGES OF THE FLIGHTS THEREOF CONTACTING THE CYLINDRICAL WALL IN FLUID-TIGHT MANNER AND THE INNER EDGES JOINED TO A CENTRAL VERTICAL SHAFT, SAID FLIGHTS BEING PERFORATED IN A PLURALITY OF VERTICALLY DISPOSED ZONES ALTERNATING WITH ZONES COMPRISING IMPERFORATE FLIGHT PORTIONS, SAID PERFORATED FLIGHT PORTIONS COMPRISING MIXING ZONES AND SAID ALTERNATE IMPERFORATE FLIGHT PORTIONS COMPRISING SETTING ZONES, THE FLIGHTS OF SAID HELICOID TERMINATING A SHORT DISTANCE BELOW THE UPPER AND ABOVE LOWER PORTIONS OF SAID CONTAINER, TO DEFINE ADDITIONAL FLUID SEPARATING ZONES, MEANS FOR INTRODUCING FLUID TO BE TREATED INTO THE BOTTOM OF SAID CONTAINER COMPRISING THE LOWER SEPARATING ZONE,
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) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |