US3117031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for countercurrent washing of solid particles such as crystals
Assignee: JOHN L KERBY
•
Filing: 1960-05-09
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Granted: 1964-01-07
•
Expires: 1980-05-09
Abstract
No abstract record available.
Inventors
- 👤 Kenneth F Griffiths
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:55
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; B01D11/0269; B01D11/0273; B01D11/0276; B01D11/0215; B01D11/0223; B01D11/0226
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE METHOD OF COUNTERCURRENT WASHING OR REFINING OF SOLID PARTICLES SUCH AS CRYSTALS COMPRISING THE STEPS OF INTRODUCING SOLID PARTICLES TO THE LOWER PORTION OF THE WASH ZONE WITHIN AN INCLINED SCREW CONVEYOR MEANS HAVING LIQUID PERMEABLE FLIGHTS; INTRODUCING WASH LIQUID TO THE UPPER PORTION OF SAID WASH ZONE; MAINTAINING POOLS COMPOSED OF A MIXTURE OF THE UPWARD MOVING SOLID PATICLES AND OF THE DOWNWARD FILTERING WASH LIQUID BETWEEN THE INDIVIDUAL FLIGHTS OF THE SCREW CONVEYOR MEANS; ROTATING SAID CONVEYOR SCREW IN A DIRECTION TO MOVE SAID SOLID PARTICLES UPWARD THROUGH THE WASH ZONE; MAINTAINING THE ROTATIONAL SPEED OF SAID CONVEYOR SCREW SO THAT WASH LIQUID FILTERS DOWNWARD THROUGH THE FILTERING SCREW FLIGHTS FASTER THAN SAID POOLS ARE MOVED UPWARD; DISCHARGING SOLID PARTICLES BEYOND THE UPPER PORTION OF THE WASH ZONE; AND DISCHARGING THE LIQUID FILTRATE BEYOND THE LOWER PORTION OF THE WASH ZONE.
Claim 2
Independent Claim
144 words
THE METHOD OF COUNTERCURRENT WASHING OR REFINING OF SOLID PARTICLES SUCH AS CRYSTALS COMPRISING THE STEPS OF INTRODUCING SOLID PARTICLES TO THE LOWER PORTION OF THE WASH ZONE WITHIN AN INCLINED SCREW CONVEYOR MEANS HAVING LIQUID PERMEABLE FLIGHTS; INTRODUCING WASH LIQUID TO THE UPPER PORTION OF SAID WASH ZONE; MAINTAINING POOLS COMPOSED OF A MIXTURE OF THE UPWARD MOVING SOLID PATICLES AND OF THE DOWNWARD FILTERING WASH LIQUID BETWEEN THE INDIVIDUAL FLIGHTS OF THE SCREW CONVEYOR MEANS; ROTATING SAID CONVEYOR SCREW IN A DIRECTION TO MOVE SAID SOLID PARTICLES UPWARD THROUGH THE WASH ZONE; MAINTAINING THE ROTATIONAL SPEED OF SAID CONVEYOR SCREW SO THAT WASH LIQUID FILTERS DOWNWARD THROUGH THE FILTERING SCREW FLIGHTS FASTER THAN SAID POOLS ARE MOVED UPWARD; DISCHARGING SOLID PARTICLES BEYOND THE UPPER PORTION OF THE WASH ZONE; AND DISCHARGING THE LIQUID FILTRATE BEYOND THE LOWER PORTION OF THE WASH ZONE.
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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) | 1967-01-06 | 1967-07-08 | 1968-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-06 | 1971-07-08 | 1972-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-06 | 1975-07-08 | 1976-01-07 | $7700.00 | Window Closed / Lapsed |