US3738814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsed countercurrent liquid-solids contacting apparatus
Assignee: NATINAL INSTITUTE FOR METALLURGY
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Filing: 1969-05-08
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Granted: 1973-06-12
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Expires: 1989-05-08
Abstract
Abstract APPARATUS FOR EFFECTING COUNTERCURRENT CONTINUOUS LIQUID-SOLIDS CONTACT COMPRISING A STACK OF INTERCONNECTED STAGES THROUGH WHICH ONLY LIQUID IS PULSED IN ONE DIRECTION AND ONLY SETTLED SOLIDS ARE PULSED IN THE OPPOSITE DIRECTION AFTER FIRST SETTLING IN ONE OF THE STAGES BEFORE PASSING TO THE NEXT STAGE. EACH STAGE IS CONNECTED TO THE NEXT STAGE BY A CONDUIT WHOICH COMMUNICATES WITH THE BELOW-SETTLEDSOLIDS LEVEL OF ONE STAGE AND WITH THE ABOVE-SETTLED-SOLIDS LEVEL OF THE NEXT STAGE. EACH CONDUIT INCLUDES A NONDESCENDINGG SECTION WHICH PREVENTS PASSAGE OF FLUIDIZED SOLIDS UNDER GRAVITY.
Inventors
- 👤 F Cloete
- 👤 M Streat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:13
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/10; B01D; B01D11/00; B01D11/02; B01D11/0215; B01D11/0223; B01D11/0242; B01D9/00; B01D9/004; B01D9/0059
Claims Analysis
Total Claims: 0
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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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |