Patent US3357791A successfully refreshed from Google Patents.
US3357791A
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Process for producing colloidal-size particles of alumina monohydrate
Assignee: ConocoPhillips Co
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Filing: 1964-07-20
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Granted: 1967-12-12
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Expires: 1984-07-20
Abstract
No abstract record available.
Inventors
- 👤 Donald R Napier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:48
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2004/00; C01P2004/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PROCESS FOR PRODUCING COLLOIDAL-SIZE PARTICLES OF ALPHA-ALUMINA MONOHYDRATE OF A BOEHMITE STRUCTURE, SAID PARTCLES BEING FURTHER CHARACTERIZED BY HAVING ONLY TRACE AMOUNTS OF INORGANIC IMPURITIES, WHICH PROCESS COMPRISES HYDROLYZING AN ALUMINUM ALCOHOLATE, CONTACTING THE RESULTING ALUMINA WITH AT LEAST ABOUT 0.6 WEIGHT PERCENT ACETIC ACID BASEN OF ALUMINA FOR AT LEAST ABOUT 1 MINUTE SO AS TO FORM THE DESIRED COLLOIDAL PARTICLE SIZE, AND RECOVERING THE THUS-FORMED PARTICLES.
Claim 2
Dependent Claim
69 words
A PROCESS FOR PRODUCING COLLOIDAL-SIZE PARTICLES OF ALPHA-ALUMINA MONOHYDRATE OF A BOEHMITE STRUCTURE, SAID PARTCLES BEING FURTHER CHARACTERIZED BY HAVING ONLY TRACE AMOUNTS OF INORGANIC IMPURITIES, WHICH PROCESS COMPRISES HYDROLYZING AN ALUMINUM ALCOHOLATE, CONTACTING THE RESULTING ALUMINA WITH AT LEAST ABOUT 0.6 WEIGHT PERCENT ACETIC ACID BASEN OF ALUMINA FOR AT LEAST ABOUT 1 MINUTE SO AS TO FORM THE DESIRED COLLOIDAL PARTICLE SIZE, AND RECOVERING THE THUS-FORMED PARTICLES.
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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) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |