Patent US3911090A successfully refreshed from Google Patents.
US3911090A
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Aluminum hydroxy carbonates nucleated with silicate anion
Assignee: Purdue Research Foundation
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Filing: 1973-05-14
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Granted: 1975-10-07
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Expires: 1993-05-14
Abstract
Abstract Aluminum hydroxy carbonates having the antacid properties of liquid aluminum hydroxide gel are produced by preparing the aluminum hydroxy carbonates in the presence of silicate anion.
Inventors
- 👤 Stanley L Hem
- 👤 Joe L White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:58
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/78; C01F7/782
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
A CRYSTALLINE ALUMINUM HYDROXY CARBONATE OF THE FORMULA M (A1(OH)2CO3) WHERE M IS LI+, NA+, K+, OR NH4+ PREPARED WITH 0.01 TO 0.0001 MOLE OF AN ALKALINE METAL SILICATE PER MOLE OF A12O3 IN THE CRYSTALLINE ALUMINUM HYDROXY CARBONATE INCLUSIVE IMPURITIES THEREIN.
Claim 2
Dependent Claim
42 words
A CRYSTALLINE ALUMINUM HYDROXY CARBONATE OF THE FORMULA M (A1(OH)2CO3) WHERE M IS LI+, NA+, K+, OR NH4+ PREPARED WITH 0.01 TO 0.0001 MOLE OF AN ALKALINE METAL SILICATE PER MOLE OF A12O3 IN THE CRYSTALLINE ALUMINUM HYDROXY CARBONATE INCLUSIVE IMPURITIES THEREIN.
Claim 3
Dependent Claim
26 words
A crystalline aluminum hydroxy carbonate according to claim 1 having a Rossett Rice time of 20 min. to 32 min. when aged 11 months at 40*C.
Claim 4
Dependent Claim
19 words
A crystalline aluminum hydroxy carbonate according to claim 1 in which M is K , Na or NH4 .
Claim 5
Dependent Claim
23 words
A crystalline aluminum hydroxy carbonate according to claim 1 in which the alkali metal silicate is lithium silicate, sodium silicate or potassium silicate.
Claim 6
Dependent Claim
18 words
A crystalline aluminum hydroxy carbonate according to claim 1 in which the alkali metal silicate is sodium silicate.
Claim 7
Dependent Claim
32 words
The crystalline aluminum hydroxy carbonate according to claim 1 which is sodium aluminum hydroxy carbonate prepared with 0.01 moles of sodium silicate per mole of Al2O3 in the sodium aluminum hydroxy carbonate.
Claim 8
Dependent Claim
32 words
The crystalline aluminum hydroxy carbonate according to claim 1 which is potassium aluminum hydroxy carbonate prepared with 0.01 moles of sodium silicate per mole of Al2O3 in the potassium aluminum hydroxy carbonate.
Claim 9
Dependent Claim
32 words
The crystalline aluminum hydroxy carbonate according to claim 1 which is ammonium aluminum hydroxy carbonate prepared with 0.01 moles of sodium silicate per mole of Al2O3 in the ammonium aluminum hydroxy carbonate.
Claim 10
Dependent Claim
41 words
A process for preparing crystalline aluminum hydroxy carbonate which comprises synthesizing the corresponding aluminum hydroxide carbonate in the presence of 0.01 to 0.0001 mole of an alkaline metal silicate per mole of Al2O3 calculated in the crystalline aluminum hydroxy carbonate produced.
Claim 11
Dependent Claim
41 words
A process for preparing crystalline aluminum hydroxy carbonate which comprises synthesizing the corresponding aluminum hydroxide carbonate in the presence of 0.01 to 0.0001 mole of an alkaline metal silicate per mole of Al2O3 calculated in the crystalline aluminum hydroxy carbonate produced.
Claim 12
Dependent Claim
33 words
The process of claim 9 wherein the synthesis is carried out in the presence of 0.01 moles of alkali metal silicate per mole of Al2O3 calculated in the crystalline aluminum hydroxy carbonAte produced.
Claim 13
Dependent Claim
118 words
The process of claim 9 wherein the crystalline hydroxy carbonate is precipitated at a pH of 6.0 to 8.0 by adding an aqueous solution containing 0.5 to 1.0 moles of aluminum chloride to a solution containing 0.01 to 0.0001 mole of sodium silicate per mole of Al2O3 calculated in the crystalline aluminum hydroxy carbonate produced and a member selected from the group consisting of 1) 0.4 to 1.0 moles of sodium carbonate and 1.0 to 2.5 moles of sodium bicarbonate; 2) 0.4 to 1.0 moles of potassium carbonate and 1.0 to 2.5 moles of potassium bicarbonate; or 3) A quantity of ammonium carbonate sufficient to supply 0.5 to 1.5 moles of carbonate (CO3 ) when mixed with water.
Claim 14
Dependent Claim
59 words
The process of claim 9 wherein an 11.4% aqueous solution containing 0.755 moles of aluminum chloride hexahydrate is added to a solution containing 0.0037 moles of sodium silicate at a concentration by weight of 0.034% and 0.570 mole of sodium carbonate at a concentration of 2.8% by weight and 1.336 moles of sodium bicarbonate at a concentration of 4.5%.
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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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |