US2999586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractionation of alumina hydrates
Assignee: Engelhard Industries Inc
•
Filing: 1955-08-03
•
Granted: 1961-09-12
•
Expires: 1975-08-03
Abstract
No abstract record available.
Inventors
- 👤 Carl D Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:55
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE METHOD OF FRACTIONATING MINUTE SOLID PARTICLES OF ALUMINA HYDRATES CONTAINING TRIHYDRATE WHICH COMPRISES MIXING AN ALUMINA TRIHYDRATE COMPOSITION OF RANDOM PARTICLE SIZE WITH WATER, ACIDIFYING THE MIXTURE TO OBTAIN AN ACIDIC AQUEOUS SLURY OF SAID ALUMINA HYDRATE SOLID PARTICLES IN THE ACIDIFIED AQUEOUS MEDIUM, SETTLING THE MIXTURE AND SEPARATING A FRACTION CONTAINING CRYSTALLINE PARTICLES OF DIFFERENT SIZE DISTRIBUTION THAN IN THE ALUMINA TRIHYDATE COMPOSITION ACIDIEFIED.
Claim 2
Independent Claim
66 words
THE METHOD OF FRACTIONATING MINUTE SOLID PARTICLES OF ALUMINA HYDRATES CONTAINING TRIHYDRATE WHICH COMPRISES MIXING AN ALUMINA TRIHYDRATE COMPOSITION OF RANDOM PARTICLE SIZE WITH WATER, ACIDIFYING THE MIXTURE TO OBTAIN AN ACIDIC AQUEOUS SLURY OF SAID ALUMINA HYDRATE SOLID PARTICLES IN THE ACIDIFIED AQUEOUS MEDIUM, SETTLING THE MIXTURE AND SEPARATING A FRACTION CONTAINING CRYSTALLINE PARTICLES OF DIFFERENT SIZE DISTRIBUTION THAN IN THE ALUMINA TRIHYDATE COMPOSITION ACIDIEFIED.
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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) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |