US3864462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing alumina monohydrate from basic aluminum nitrates
Assignee: Reynolds Metals Co
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Filing: 1970-06-18
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Granted: 1975-02-04
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Expires: 1990-06-18
Abstract
Abstract Process for producing alumina monohydrate and aluminum nitrate from basic aluminum nitrates by preparing an aqueous solution of the basic aluminum nitrate having a nitrate concentration low enough to prevent solution of Al2O3, heating the solution under autogenous pressure to convert the free alumina in the basic aluminum nitrate to solid alumina monohydrate, and recovering the solid alumina monohydrate.
Inventors
- 👤 Charles P Bruen
- 👤 Donald H Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:06
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/30; C01F7/308; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
THE PROCESS FOR PRODUCING ALUMINA MONOHYDRIDE WHICH COMPRISES: (1) ADDING TO A BASIC ALUMINUM NITRATE HAVING THE EMPIRICAL FORMULA
Claim 2
Dependent Claim
19 words
THE PROCESS FOR PRODUCING ALUMINA MONOHYDRIDE WHICH COMPRISES: (1) ADDING TO A BASIC ALUMINUM NITRATE HAVING THE EMPIRICAL FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |