Patent US4763226A successfully refreshed from Google Patents.
Patent US3001293A successfully refreshed from Google Patents.
US3001293A
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Process and installation for the dehydration of sludges
Assignee: Vereinigte Aluminium Werke AG
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Filing: 1958-01-23
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Granted: 1961-09-26
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Expires: 1978-01-23
Abstract
No abstract record available.
Inventors
- 👤 Wendt Guenther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:31
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/08; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/186; C01F; C01F7/00; C01F7/48; C01F7/50; C01F7/54; C01P; C01P2004/00; C01P2004/60; C01P2004/61; Y; Y10; Y10S; Y10S159/00; Y10S159/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A METHOD FOR THE STEPWISE DEHYDRATION OF AN AQUEOUS SUSPENSION OF CRYOLITE, SAID SUSPENSION HAVING A SOLIDS CONTENT OF ABOUT TWO TO FIVE PERCENT BY WEIGHT, AND WHEREIN THE MAJOR PORTION OF SAID CRYOLITE HAS A PARTICLE SIZE OF LESS THAN 100 MICRONS, WHICH METHOD COMPRISES THE STEPS OF CONTINUOUSLY CENTRIFUGING SAID SUSPENSION IN THIN LAYERS UNDER SIMULTANEOUS APPLICATION OF CAPILLARY FORCES IN SAID LAYERS, THEREBY OBTAINING A CONCENTRATED SLUDGE HAVING A SOLIDS CONTENT OF ABOUT 10 TO 30% BY WEIGHT, IN WHICH THE SOLID MATTER HAS UNDERGONE STRUCTURAL CHANGES ENHANCING THE FURTHER CONCENTRATION OF THE RESULTING CENTRIFUGATE DUE TO THE COMBINED EFFECT OF THE OCCURRING CENTRIFUGAL AND CAPILLARY FORCES, THEREAFTER CENTRIFUGING THE CONCENTRATED SLUDGE BATCH-
Claim 2
Independent Claim
116 words
A METHOD FOR THE STEPWISE DEHYDRATION OF AN AQUEOUS SUSPENSION OF CRYOLITE, SAID SUSPENSION HAVING A SOLIDS CONTENT OF ABOUT TWO TO FIVE PERCENT BY WEIGHT, AND WHEREIN THE MAJOR PORTION OF SAID CRYOLITE HAS A PARTICLE SIZE OF LESS THAN 100 MICRONS, WHICH METHOD COMPRISES THE STEPS OF CONTINUOUSLY CENTRIFUGING SAID SUSPENSION IN THIN LAYERS UNDER SIMULTANEOUS APPLICATION OF CAPILLARY FORCES IN SAID LAYERS, THEREBY OBTAINING A CONCENTRATED SLUDGE HAVING A SOLIDS CONTENT OF ABOUT 10 TO 30% BY WEIGHT, IN WHICH THE SOLID MATTER HAS UNDERGONE STRUCTURAL CHANGES ENHANCING THE FURTHER CONCENTRATION OF THE RESULTING CENTRIFUGATE DUE TO THE COMBINED EFFECT OF THE OCCURRING CENTRIFUGAL AND CAPILLARY FORCES, THEREAFTER CENTRIFUGING THE CONCENTRATED SLUDGE BATCH-
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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) | 1964-09-25 | 1965-03-27 | 1965-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-25 | 1969-03-27 | 1969-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-25 | 1973-03-27 | 1973-09-26 | $7700.00 | Window Closed / Lapsed |