Patent US3086845A successfully refreshed from Google Patents.
US3086845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina of controlled density
Assignee: Wyeth Holdings LLC
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Filing: 1958-01-30
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Granted: 1963-04-23
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Expires: 1978-01-30
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Malley
- 👤 Harvey D Schindler
- 👤 Jr John D Pennell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:09
CPC Classifications
B; B01; B01J; B01J13/00; B01J21/00; B01J21/02; B01J21/04; C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/14; C01P2006/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A METHOD OF PRODUCING ALUMINA OF CONTROLLED DENSITY WHICH COMPRISES DENSIFYING BY HOMOGENIZATION AN AQUEOUS SLURRY OF A HYDRATED ALUMINA TO AN EXTENT CORRESPONDING TO THAT OBTAINED BY PASSING SUCH AN AQUEOUS SLURRY THROUGH A HOMOGENIZING VALVE AT A PRESSURE DROP BETWEEN ABOUT 500 AND 3000 P.S.I. AND THEREAFTER DRYING THE RESULTING DENSIFIED HYDRATED ALUMINA, SAID HYDRATED ALUMINA SLURRY BEING PRODUCED BY PRECIPITATING HYDRATED ALUMINNA COMPPOUND BY ADMIXTURE OF A NEUTRALIZING ALUMINA COMPOUND BY ADMIXTURE OF A NEUTRALIZING AGENT THEREWITH AT A PH OF FROM 7 TO 10.5 AND AGEING AT A TEMPERATURE OF ABOUT 90 TO 130*F. FOR AT LEAST 0.25 TO 0.5 HOUR AT A HIGHER PH WITHIN THE RANGE OF 10 TO 11.
Claim 2
Independent Claim
116 words
A METHOD OF PRODUCING ALUMINA OF CONTROLLED DENSITY WHICH COMPRISES DENSIFYING BY HOMOGENIZATION AN AQUEOUS SLURRY OF A HYDRATED ALUMINA TO AN EXTENT CORRESPONDING TO THAT OBTAINED BY PASSING SUCH AN AQUEOUS SLURRY THROUGH A HOMOGENIZING VALVE AT A PRESSURE DROP BETWEEN ABOUT 500 AND 3000 P.S.I. AND THEREAFTER DRYING THE RESULTING DENSIFIED HYDRATED ALUMINA, SAID HYDRATED ALUMINA SLURRY BEING PRODUCED BY PRECIPITATING HYDRATED ALUMINNA COMPPOUND BY ADMIXTURE OF A NEUTRALIZING ALUMINA COMPOUND BY ADMIXTURE OF A NEUTRALIZING AGENT THEREWITH AT A PH OF FROM 7 TO 10.5 AND AGEING AT A TEMPERATURE OF ABOUT 90 TO 130*F. FOR AT LEAST 0.25 TO 0.5 HOUR AT A HIGHER PH WITHIN THE RANGE OF 10 TO 11.
References Cited (Backward Citations)
US2590833A
Cited
US2657115A
Cited
US2809169A
Cited
US2737444A
Cited
US2914486A
Cited
US2838375A
Cited
US2867588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-22 | 1966-10-22 | 1967-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-22 | 1970-10-22 | 1971-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-22 | 1974-10-22 | 1975-04-23 | $7700.00 | Window Closed / Lapsed |