US3273790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for centrifugal separation of suspensions
Assignee: Alfa Laval Holdings Amsterdam AB
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Filing: 1964-06-04
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Granted: 1966-09-20
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Expires: 1984-06-04
Abstract
No abstract record available.
Inventors
- 👤 Dahlberg Bengt Ingmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:29
CPC Classifications
C; C08; C08B; C08B30/00; C08B30/08; B; B04; B04B; B04B1/00; B04B1/10; B04B1/12; B04B11/00; B04B11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
214 words
IN THE CENTRIFUGAL SEPARATION OF A SUSPENSION OF SOLIDS IN A LIQUID, THE METHOD COMPRISING THE STEPS OF FEEDING THE SUSPENSION TO A SEPARATING ZONE OF A FIRST LOCUS OF CENTRIFUGAL FORCE AND THERE SEPARATING THE SUSPENSION INTO LIQUID AND SLUDGE, DISCHARGING THE SEPARATED LIQUID FROM SAID LOCUS WHILE SEPARATELY DISCHARGING A RELATIVELY LOW CONCENTRATION OF SAID SLUDGE THROUGH NOZZLES FROM A SLUDGE CHAMBER OF THE LOCUS SURROUNDING SAID ZONE, FEEDING DISCHARGED SLUDGE FROM SAID FIRST LOCUS TO A SEPARATING ZONE OF A SECOND LOCUS OF CENTRIFUGAL FORCE AND THERE SEPARATING IT INTO LIQUID AND SLUDGE, DISCHARGING SAID SECOND-SEPARATED LIQUID FROM THE SECOND LOCUS WHILE SEPARATELY DISCHARGING A RELATIVELY HIGH CONCENTRATION OF SAID SECOND-SEPARATED SLUDGE THROUGH NOZZLES FROM A SLUDGE CHAMBER OF THE SECOND LOCUS SURRONDING SAID ZONE THEREOF, SUPPLYING A MEASURING LIQUID SEPARATELY AND AT A CONSTANT RATE UNDER PRESSUE TO SAID SLUDGE CHAMBER OF THE SECOND LOCUS BY WAY OF A CLOSED PATH, WHEREBY THE PRESSURE IN SAID PATH INCREASES WITH INCREASED CONCENTRATION OF THE SLUDGE IN SAID SLUDGE CHAMBER OF THE SECOND LOCUS, AND VARYING THE PROPORTION OF SOLIDS IN SAID SUSPENSION FED TO THE FIRST LOCUS IN RESPONSE TO CHANGES IN THE PRESSURE IN SAID PATH TO COUNTERACT VARIATIONS IN THE CONCENTRATION OF SAID SLUDGE DISCHARGED FROM THE SECOND LOCUS.
Claim 2
Dependent Claim
214 words
IN THE CENTRIFUGAL SEPARATION OF A SUSPENSION OF SOLIDS IN A LIQUID, THE METHOD COMPRISING THE STEPS OF FEEDING THE SUSPENSION TO A SEPARATING ZONE OF A FIRST LOCUS OF CENTRIFUGAL FORCE AND THERE SEPARATING THE SUSPENSION INTO LIQUID AND SLUDGE, DISCHARGING THE SEPARATED LIQUID FROM SAID LOCUS WHILE SEPARATELY DISCHARGING A RELATIVELY LOW CONCENTRATION OF SAID SLUDGE THROUGH NOZZLES FROM A SLUDGE CHAMBER OF THE LOCUS SURROUNDING SAID ZONE, FEEDING DISCHARGED SLUDGE FROM SAID FIRST LOCUS TO A SEPARATING ZONE OF A SECOND LOCUS OF CENTRIFUGAL FORCE AND THERE SEPARATING IT INTO LIQUID AND SLUDGE, DISCHARGING SAID SECOND-SEPARATED LIQUID FROM THE SECOND LOCUS WHILE SEPARATELY DISCHARGING A RELATIVELY HIGH CONCENTRATION OF SAID SECOND-SEPARATED SLUDGE THROUGH NOZZLES FROM A SLUDGE CHAMBER OF THE SECOND LOCUS SURRONDING SAID ZONE THEREOF, SUPPLYING A MEASURING LIQUID SEPARATELY AND AT A CONSTANT RATE UNDER PRESSUE TO SAID SLUDGE CHAMBER OF THE SECOND LOCUS BY WAY OF A CLOSED PATH, WHEREBY THE PRESSURE IN SAID PATH INCREASES WITH INCREASED CONCENTRATION OF THE SLUDGE IN SAID SLUDGE CHAMBER OF THE SECOND LOCUS, AND VARYING THE PROPORTION OF SOLIDS IN SAID SUSPENSION FED TO THE FIRST LOCUS IN RESPONSE TO CHANGES IN THE PRESSURE IN SAID PATH TO COUNTERACT VARIATIONS IN THE CONCENTRATION OF SAID SLUDGE DISCHARGED FROM THE SECOND LOCUS.
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |