US3925428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxy-aluminum nitrate polymer production
Assignee: Chevron USA Inc
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Filing: 1974-04-08
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Granted: 1975-12-09
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Expires: 1994-04-08
Abstract
Abstract Hydroxy-aluminum nitrate polymer and ammonium nitrate are produced by reacting aluminum nitrate and urea in aqueous solution. The hydroxy-aluminum nitrate polymer is useful for consolidating soil in secondary oil recovery and for reducing the caking tendency of ammonium salt fertilizer compositions.
Inventors
- 👤 Clive Hodgson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:39
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/66; C01B; C01B21/00; C01B21/20; C01B21/38; C01B21/46; C05; C05C; C05C1/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
10 words
A PROCESS OF PREPARING HYDROXY-ALUMINUM NITRATE OF THE EMPIRICAL FORMULA
Claim 2
Dependent Claim
10 words
A PROCESS OF PREPARING HYDROXY-ALUMINUM NITRATE OF THE EMPIRICAL FORMULA
Claim 3
Dependent Claim
38 words
The process of claim 1 wherein the molar ratio of aluminum nitrate to urea varies from about 1:0.5 to 1:1.3 and the molar ratio of aluminum to hydroxyl in the hydroxy-aluminum nitrate varies from about 1:0.9 to 1:2.6.
Claim 4
Dependent Claim
38 words
The process of claim 2 wherein the molar ratio of aluminum nitrate to urea varies from about 1:1 to 1:1.3 and the molar ratio of aluminum to hydroxyl in the hydroxy-aluminum polymer varies from about 1:2 to 1:2.6.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the aluminum nitrate is aluminum nitrate nonahydrate.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the temperature varies from 75* to 125*C.
Claim 7
Dependent Claim
19 words
The process of claim 1, wherein about 10 to 100 mols of water per mol of urea is employed.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |