US4105579A
Expired / Lapsed
US
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Process for producing pharmaceutical grade aluminum hydroxide gels
Assignee: Barcroft Co
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Filing: 1976-03-04
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Granted: 1978-08-08
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Expires: 1996-03-04
Abstract
Abstract A process for producing aluminum hydroxide gels substantially free of sodium ions involves a heterogeneous reaction between an aqueous solution of a water soluble aluminum salt and an aqueous slurry of a water soluble alkaline earth carbonate.
Inventors
- 👤 Green B. Glasscock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:21
CPC Classifications
A; A61; A61K; A61K33/00; A61K33/06; A61K33/08; B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0056; C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01P; C01P2006/00; C01P2006/21
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
56 words
A process for producing aluminum hydroxide gels which comprises combining water, a water soluble salt of aluminum selected from the group consisting of aluminum chloride, aluminum sulfate and aluminum nitrate, and a water insoluble alkaline earth carbonate under heterogeneous reaction conditions while maintaining a reaction pH between 4.7 and 5.5 and isolating the aluminum hydroxide gel.
Claim 2
Dependent Claim
56 words
A process for producing aluminum hydroxide gels which comprises combining water, a water soluble salt of aluminum selected from the group consisting of aluminum chloride, aluminum sulfate and aluminum nitrate, and a water insoluble alkaline earth carbonate under heterogeneous reaction conditions while maintaining a reaction pH between 4.7 and 5.5 and isolating the aluminum hydroxide gel.
Claim 3
Dependent Claim
31 words
The process of claim 1 in which a constantly flowing stream of an aqueous solution of the aluminum salt is continuously added to a constantly flowing aqueous slurry of the carbonate.
Claim 4
Dependent Claim
20 words
The process of claim 1 in which the carbonate is selected from the group consisting of calcium and magnesium carbonates.
Claim 5
Dependent Claim
13 words
An aluminum hydroxide gel produced by carrying out the process of claim 1.
Claim 6
Dependent Claim
82 words
A process for producing aluminum hydroxide gels which comprises adding a 14 - 28% by weight aqueous solution of an aluminum salt selected from its chloride, aluminum sulfate and aluminum nitrate to a 4 - 10% by weight aqueous slurry of a carbonate selected from the group consisting of calcium and magnesium carbonate under agitated, heterogeneous reaction conditions while maintaining a reaction pH between 4.7 and 5.5 by adjustment of the relative amounts of the reactants, and isolating the aluminum hydroxide gel.
Claim 7
Dependent Claim
82 words
A process for producing aluminum hydroxide gels which comprises adding a 14 - 28% by weight aqueous solution of an aluminum salt selected from its chloride, aluminum sulfate and aluminum nitrate to a 4 - 10% by weight aqueous slurry of a carbonate selected from the group consisting of calcium and magnesium carbonate under agitated, heterogeneous reaction conditions while maintaining a reaction pH between 4.7 and 5.5 by adjustment of the relative amounts of the reactants, and isolating the aluminum hydroxide gel.
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) | 1981-08-07 | 1982-02-06 | 1982-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-07 | 1986-02-06 | 1986-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-07 | 1990-02-06 | 1990-08-08 | $7700.00 | Window Closed / Lapsed |