Patent US4594729A successfully refreshed from Google Patents.
Patent US2653858A successfully refreshed from Google Patents.
US2653858A
Expired / Lapsed
US
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Precipitation of aluminum hydroxide
Assignee: Alcoa Corp
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Filing: 1951-09-22
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Granted: 1953-09-29
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Expires: 1971-09-22
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:19
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/14; C01F7/144; C01F7/147
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE PROCESS OF PRODUCING ALUMINUM HYDROXIDE FROM A SUPERSATURATED ALKALI METAL ALUMINATE SOLUTION, WHICH COMPRISES CONTINUOUSLY DISCHARGING A STREAM OF SUCH SOLUTION INTO AN UPPER AGITATED PORTION OF A TANK IN WHICH A PREDETERMINED LEVEL OF THE SOLUTION IS MAINTAINED, THE SAID AGITATED UPPER PORTION BEING DEFINED BY SEPARATING WALLS BUT OPENING AT THE BOTTOM INTO THE UNDERLYING PORTION OF THE TANK, WITHDRAWING SOLUTION FROM THE TANK THROUGH AN OUTLET WHICH OPENS INTO THAT PORTION OF THE SOLUTION IN THE TANK WHICH IS AT THE LEVEL OF THE SAID SEPARATING WALLS BUT IS SEPARATED FROM THE SAID AGITATED PORTION BY THE SAID WALLS, INDUCING FLOW DOWNWARDLY THROUGH SAID OPENING INTO THE LOWER PORTION OF THE SAID TANK, AND ELEVATING A PORTION OF SAID FLOW WITH PARTICLES OF ALUMINUM HYDROXIDE FOUND THEREIN THROUGH A SEPARATED PASSAGE INTO THE SAID UPPER PORTION DEFINED BY THE SAID
Claim 2
Dependent Claim
144 words
THE PROCESS OF PRODUCING ALUMINUM HYDROXIDE FROM A SUPERSATURATED ALKALI METAL ALUMINATE SOLUTION, WHICH COMPRISES CONTINUOUSLY DISCHARGING A STREAM OF SUCH SOLUTION INTO AN UPPER AGITATED PORTION OF A TANK IN WHICH A PREDETERMINED LEVEL OF THE SOLUTION IS MAINTAINED, THE SAID AGITATED UPPER PORTION BEING DEFINED BY SEPARATING WALLS BUT OPENING AT THE BOTTOM INTO THE UNDERLYING PORTION OF THE TANK, WITHDRAWING SOLUTION FROM THE TANK THROUGH AN OUTLET WHICH OPENS INTO THAT PORTION OF THE SOLUTION IN THE TANK WHICH IS AT THE LEVEL OF THE SAID SEPARATING WALLS BUT IS SEPARATED FROM THE SAID AGITATED PORTION BY THE SAID WALLS, INDUCING FLOW DOWNWARDLY THROUGH SAID OPENING INTO THE LOWER PORTION OF THE SAID TANK, AND ELEVATING A PORTION OF SAID FLOW WITH PARTICLES OF ALUMINUM HYDROXIDE FOUND THEREIN THROUGH A SEPARATED PASSAGE INTO THE SAID UPPER PORTION DEFINED BY THE SAID
References Cited (Backward Citations)
US994679A
Cited
US1160848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-28 | 1957-03-30 | 1957-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-28 | 1961-03-30 | 1961-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-28 | 1965-03-30 | 1965-09-29 | $7700.00 | Window Closed / Lapsed |