US3250462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sludge concentration by centrifugation
Assignee: Alfa Laval Holdings Amsterdam AB
•
Filing: 1962-11-29
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Granted: 1966-05-10
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Expires: 1982-11-29
Abstract
No abstract record available.
Inventors
- 👤 Thylefors Henric Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:40
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
126 words
IN THE CENTRIFUGAL CONCENTRATION OF SLUDGE CONTAINED IN A LIQUID SUSPENSION, THE METHOD WHICH COMPRISES FEEDING THE SUSPENSION TO A ROTATING LOCUS OF CENTRIFUGAL FORCE AND THERE CENTRIFUGALLY SEPARATING SLUDGE FROM THE SUSPENSION LIQUID, SAID SLUDGE MOVING OUTWARDLY IN THE LOCUS UNDER THE ACTION OF CENTRIFUGAL FORCE AND TOWARD AN OUTLET AT THE PERIPHERY OF THE LOCUS, FEEDING SEPARATELY CONFINED STREAMS OF WASHING LIQUID AND PREVIOUSLY SEPARATED SLUDGE OUTWARDLY THROUGH SAID LOCUS UNDER SAID FORCE AND RELEASING SAID STREAMS IN THE REGION IMMEDIATELY ADJACENT THE ENTRANCE TO SAID PERIPHERAL OUTLET, WHEREBY NEWLY SEPARATED SLUDGE IS WASHED BY THE WASHING LIQUID AND SAID LAST LIQUID IS DISPLACED INWARD TOWARD THE ROTATION AXIS BY SAID NEWLY AND PREVIOUSLY SEPARATED SLUDGE, DISCHARGING THE WASHED NEWLY SEPARATED SLUDGE AND PREVIOUSLY
Claim 2
Dependent Claim
126 words
IN THE CENTRIFUGAL CONCENTRATION OF SLUDGE CONTAINED IN A LIQUID SUSPENSION, THE METHOD WHICH COMPRISES FEEDING THE SUSPENSION TO A ROTATING LOCUS OF CENTRIFUGAL FORCE AND THERE CENTRIFUGALLY SEPARATING SLUDGE FROM THE SUSPENSION LIQUID, SAID SLUDGE MOVING OUTWARDLY IN THE LOCUS UNDER THE ACTION OF CENTRIFUGAL FORCE AND TOWARD AN OUTLET AT THE PERIPHERY OF THE LOCUS, FEEDING SEPARATELY CONFINED STREAMS OF WASHING LIQUID AND PREVIOUSLY SEPARATED SLUDGE OUTWARDLY THROUGH SAID LOCUS UNDER SAID FORCE AND RELEASING SAID STREAMS IN THE REGION IMMEDIATELY ADJACENT THE ENTRANCE TO SAID PERIPHERAL OUTLET, WHEREBY NEWLY SEPARATED SLUDGE IS WASHED BY THE WASHING LIQUID AND SAID LAST LIQUID IS DISPLACED INWARD TOWARD THE ROTATION AXIS BY SAID NEWLY AND PREVIOUSLY SEPARATED SLUDGE, DISCHARGING THE WASHED NEWLY SEPARATED SLUDGE AND PREVIOUSLY
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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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |