US4339421A
Expired / Lapsed
US
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Synthetic magnesium aluminosilicate, process for the manufacture thereof, and pharmaceutical compositions containing same
Assignee: Laboratoires OM SA
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Filing: 1979-08-24
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Granted: 1982-07-13
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Expires: 1999-08-24
Abstract
Abstract Synthetic magnesium aluminosilicate consisting essentially by weight of 47-57% SiO 2 , 9-11% Al 2 O 3 , 3-5% MgO, 1-3% CaO, and less than 5% Na 2 O, balance water to total 100% calculated analytically. A process for manufacturing, comprising the steps of stirring into a first aqueous solution, containing the corresponding amounts of magnesium sulfate and aluminum sulfate, a second aqueous solution containing sodium silicate and sodium hydroxide. thereafter adding a third aqueous solution containing a corresponding amount of calcium chloride, continuing the stirring, filtering off and washing the precipitate, and drying the precipitate at a temperature below 100° C., or, instead of adding the third aqueous solution containing calcium chloride, by using lime water in the manufacturing process and for washing.
Inventors
- 👤 Adrian Schultess
- 👤 Jean-Claude Farine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:58
CPC Classifications
A; A61; A61K; A61K33/00; A61K33/06; C; C01; C01B; C01B33/00; C01B33/20; C01B33/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
171 words
A process for manufacturing an amorphous synthetic magnesium aluminosilicate of high adsorbency containing combined CaO and consisting essentially of 47-57% SiO 2 , 9-11% Al 2 O 3 , 3-5% MgO, 1-3% CaO, and less than 5% Na 2 O, balance water to total 100%, said percentages being by weight and calculated analytically, comprising the steps of stirring into a first aqueous solution, containing magnesium sulfate and aluminum sulfate, a second aqueous solution containing sodium silicate and sodium hydroxide, thereafter adding a third aqueous solution containing calcium chloride, thereby forming a precipitate, while continuing the stirring, filtering off and washing the precipitate, and drying the precipitate at a temperature below 100° C., the proportions of the reagents and the temperatures in the process being such that precipitate contains combined SiO 2 , Al 2 O 3 , MgO, CaO and Na 2 O within the ratios specified by the above weight percentages and forms at a pH of about 9, and the drying being continued until said water content is obtained.
Claim 2
Dependent Claim
171 words
A process for manufacturing an amorphous synthetic magnesium aluminosilicate of high adsorbency containing combined CaO and consisting essentially of 47-57% SiO 2 , 9-11% Al 2 O 3 , 3-5% MgO, 1-3% CaO, and less than 5% Na 2 O, balance water to total 100%, said percentages being by weight and calculated analytically, comprising the steps of stirring into a first aqueous solution, containing magnesium sulfate and aluminum sulfate, a second aqueous solution containing sodium silicate and sodium hydroxide, thereafter adding a third aqueous solution containing calcium chloride, thereby forming a precipitate, while continuing the stirring, filtering off and washing the precipitate, and drying the precipitate at a temperature below 100° C., the proportions of the reagents and the temperatures in the process being such that precipitate contains combined SiO 2 , Al 2 O 3 , MgO, CaO and Na 2 O within the ratios specified by the above weight percentages and forms at a pH of about 9, and the drying being continued until said water content is obtained.
Claim 3
Dependent Claim
167 words
A process for manufacturing an amorphous synthetic magnesium aluminosilicate of high absorbency containing combined CaO and consisting essentially of 47-57% SiO 2 , 9-11% Al 2 O 3 , 3-5% MgO, 1-3% CaO and less than 5% Na 2 O, balance water to total 100%, said percentages being by weight and calculated analytically, comprising the steps of: stirring into a first aqueous solution, containing magnesium sulfate and aluminum sulfate, a second aqueous solution containing sodum silicate and sodium hydroxide, adding lime water, permitting a precipitate to form, while containing the stirring, filtering off and washing the precipitate, and drying the precipitate at a temperature below 100° C., the proportions of the reagents and the temperatures in the process being such that the precipitate contains combined SiO 2 , Al 2 O 3 , MgO, CaO and Na 2 O within the ratios specified by the above weight percentages and forms at a pH of about 9, and the drying being continued until said water cotent is formed.
Claim 4
Dependent Claim
167 words
A process for manufacturing an amorphous synthetic magnesium aluminosilicate of high absorbency containing combined CaO and consisting essentially of 47-57% SiO 2 , 9-11% Al 2 O 3 , 3-5% MgO, 1-3% CaO and less than 5% Na 2 O, balance water to total 100%, said percentages being by weight and calculated analytically, comprising the steps of: stirring into a first aqueous solution, containing magnesium sulfate and aluminum sulfate, a second aqueous solution containing sodum silicate and sodium hydroxide, adding lime water, permitting a precipitate to form, while containing the stirring, filtering off and washing the precipitate, and drying the precipitate at a temperature below 100° C., the proportions of the reagents and the temperatures in the process being such that the precipitate contains combined SiO 2 , Al 2 O 3 , MgO, CaO and Na 2 O within the ratios specified by the above weight percentages and forms at a pH of about 9, and the drying being continued until said water cotent is formed.
References Cited (Backward Citations)
US2384563A
Cited
US2970889A
Cited
US2990247A
Cited
FR53M
Cited
GB925001A
Cited
US3032394A
Cited
DE1667490B1
Cited
GB1241561A
Cited
US3636200A
Cited
US3767794A
Cited
GB1385158A
Cited
US4108984A
Cited
PL59294Y1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |