US3188174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum product and its method of preparation
Assignee: Gulf Research and Development Co
•
Filing: 1961-06-20
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Granted: 1965-06-08
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Expires: 1981-06-20
Abstract
No abstract record available.
Inventors
- 👤 William L Kehl
- 👤 Meredith M Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:45
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/14; C01P2006/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
A PROCESS FOR PRODUCING ALUMINA COMPRISING SLOWLY ADDING IN INCREMENTS AND WITH STIRRING AN AQUEOUS ACIDIC SOLUTION OF AN ALUMINUJ SALT WHOSE ANION IS REMOVABLE FROM SAID ALUMINA TO A SUBSTANTIALLY ALKALI METAL-FREE AQUEOUS AMMONIUM HYDROXIDE SOLUTION, MAINTAINING THE PH OF THE AMMONIUM HYDDROXIDE SOLUTION AT A VALUE ABOVE 7 THROUGHOUT THE ADDITION OF ACIDIC ALUMINUM SALT SOLUTION, SUBSTANTIALLY AVOIDING EVEN LOCALIZED ZONES IN SAID AMMONIUM HYDROXIDE SOLUTION BELOW A PH OF 7 DURING THE ADDITION OF ACIDIC ALUMINUM SALT SOLUTION, PRECIPITAINING A CRYSTALLINE ALUMINA HYDRATE CONTAINING BETWEEN 1.2 AND 2.6 MOLES OF WATER OF HYDRATION PER MOLE OF AL2O3, SAID ALUMINA HYDRATE BEING UNSTABLE AND TENDING TO TRANSFORM INTO A DIFFERENT HYDRATE OF ALUMINA, PREVENTING SAID TRANSFORMATION BY MAINTAINING SAID ALUMINA HYDRATE PRECIPATE AT A TEMPERATURE ABOVE ABOUT 170*F. THROUGHOUT THE MIXING OPERATION AND SUBSTANTIALLY AS LONG AS IT IS IN THE WET STATE, CONTINUOUSY MAINTAINING AMMONIA SATURATION IN THE MIXED SOLUTION SUFFICIENT TO SUBSTANTIALLY AVOID EVEN LOCALIZED ZONES BELOW A PH OF 7, SEPARATING SAID ALUMINA HYDRATE FROM SUPERNATANT LIQUID AND DRYING SAID ALUMINA HYDRATE.
Claim 2
Dependent Claim
177 words
A PROCESS FOR PRODUCING ALUMINA COMPRISING SLOWLY ADDING IN INCREMENTS AND WITH STIRRING AN AQUEOUS ACIDIC SOLUTION OF AN ALUMINUJ SALT WHOSE ANION IS REMOVABLE FROM SAID ALUMINA TO A SUBSTANTIALLY ALKALI METAL-FREE AQUEOUS AMMONIUM HYDROXIDE SOLUTION, MAINTAINING THE PH OF THE AMMONIUM HYDDROXIDE SOLUTION AT A VALUE ABOVE 7 THROUGHOUT THE ADDITION OF ACIDIC ALUMINUM SALT SOLUTION, SUBSTANTIALLY AVOIDING EVEN LOCALIZED ZONES IN SAID AMMONIUM HYDROXIDE SOLUTION BELOW A PH OF 7 DURING THE ADDITION OF ACIDIC ALUMINUM SALT SOLUTION, PRECIPITAINING A CRYSTALLINE ALUMINA HYDRATE CONTAINING BETWEEN 1.2 AND 2.6 MOLES OF WATER OF HYDRATION PER MOLE OF AL2O3, SAID ALUMINA HYDRATE BEING UNSTABLE AND TENDING TO TRANSFORM INTO A DIFFERENT HYDRATE OF ALUMINA, PREVENTING SAID TRANSFORMATION BY MAINTAINING SAID ALUMINA HYDRATE PRECIPATE AT A TEMPERATURE ABOVE ABOUT 170*F. THROUGHOUT THE MIXING OPERATION AND SUBSTANTIALLY AS LONG AS IT IS IN THE WET STATE, CONTINUOUSY MAINTAINING AMMONIA SATURATION IN THE MIXED SOLUTION SUFFICIENT TO SUBSTANTIALLY AVOID EVEN LOCALIZED ZONES BELOW A PH OF 7, SEPARATING SAID ALUMINA HYDRATE FROM SUPERNATANT LIQUID AND DRYING SAID ALUMINA HYDRATE.
Claim 3
Dependent Claim
115 words
A DRY, HARD CRYSTALLINE ALUMINA HYDRATE HAVING BETWEEN 1.2 AND 2.6 MOLES OF WATER OF HYDRATION PER MOLE OF ALUMINA, SAID HYDRATE PRECIPITATED HAVING A DISTINCTIVE CRYSTALLINE STRUCTURE SO THAT SAID HYDRATE IS INDENTIFABLE BY X-RAY DIFFRACTION ANALYSIS, SAID ALUMINA HYDRATE TENDING TO TRANSFORM TO A DIFFERENT HYDRATE FORM IN THE PRESENCE OF WATER PRIOR TO DRYING BUT DRIED PRIOR TO TRANSFORMATION TO A DIFFERENT HYDRATE FORM, SAID HYDRATE SUBSTANTIALLY FREE OF ALUMINA MONOHYDRATE AND ALUMINA TRIHYDRATE, SAID HYDRATE UPON HEATING STATRING TO LOSE ITS WATER OF HYDRATION AT ABOUT 360*F. AND COMPLETEING LOSS OF WATER OF HYDRATION AT ABOUT 930*F. AT WHICH TEMPERATURE IF CONTAINS LESS THAN ABOUT 3 PERCENT BY WEIGHT OF WATER.
Claim 4
Dependent Claim
115 words
A DRY, HARD CRYSTALLINE ALUMINA HYDRATE HAVING BETWEEN 1.2 AND 2.6 MOLES OF WATER OF HYDRATION PER MOLE OF ALUMINA, SAID HYDRATE PRECIPITATED HAVING A DISTINCTIVE CRYSTALLINE STRUCTURE SO THAT SAID HYDRATE IS INDENTIFABLE BY X-RAY DIFFRACTION ANALYSIS, SAID ALUMINA HYDRATE TENDING TO TRANSFORM TO A DIFFERENT HYDRATE FORM IN THE PRESENCE OF WATER PRIOR TO DRYING BUT DRIED PRIOR TO TRANSFORMATION TO A DIFFERENT HYDRATE FORM, SAID HYDRATE SUBSTANTIALLY FREE OF ALUMINA MONOHYDRATE AND ALUMINA TRIHYDRATE, SAID HYDRATE UPON HEATING STATRING TO LOSE ITS WATER OF HYDRATION AT ABOUT 360*F. AND COMPLETEING LOSS OF WATER OF HYDRATION AT ABOUT 930*F. AT WHICH TEMPERATURE IF CONTAINS LESS THAN ABOUT 3 PERCENT BY WEIGHT OF WATER.
Claim 5
Dependent Claim
125 words
A CALCINED ALUMINA ANHYDRIDE WHOSE PRECURSOR IS A HARD CRYSTALLINE ALUMINA HYDRATE HAVING BETWEEN 1.2 AND 2.6 MOLES OF WATER OF HYDRATION PER MOLE OF ALUMINA, SAID PRECURSOR HYDRATE PRECIPITATED HAVING A DISTINCITIVE CRYSTALLINE STRUCTURE SO THAT SAID PRECURSOR HYDRATE IS IDENTIFIABLE BY X-RAY DIFFRACTION ANALYSIS, SAID PRECURSOR HYDRATE TENDING TO TRANSFORM TO A DIFFERENT HYDRATE FORM IN THE PRESENCE OF WATER PRIOR TO DRYING BUT DRIED PRIOR TO TRANSFORMATION TO A DIFFERENT HYDRATE FORM, SAID PRECURSOR HYDRATE SUBSTANTIALLY FREE OF ALUMINA MONOHYDRATE AND ALUMINA TRIHYDRATE, SAID PRECURSOR HYDRATE UPON HEATING STARTING TO LOSE ITS WATER OF HYDRATION AT ABOUT 360*F. AND COMPLETING LOSS OF WATER OF HYDRATION AT ABOUT 930*F. AT WHICH TEMPERATURE IT CONTAINS LESS THAN ABOUT 3 PERCENT BY WEIGHT OF WATER.
Claim 6
Dependent Claim
125 words
A CALCINED ALUMINA ANHYDRIDE WHOSE PRECURSOR IS A HARD CRYSTALLINE ALUMINA HYDRATE HAVING BETWEEN 1.2 AND 2.6 MOLES OF WATER OF HYDRATION PER MOLE OF ALUMINA, SAID PRECURSOR HYDRATE PRECIPITATED HAVING A DISTINCITIVE CRYSTALLINE STRUCTURE SO THAT SAID PRECURSOR HYDRATE IS IDENTIFIABLE BY X-RAY DIFFRACTION ANALYSIS, SAID PRECURSOR HYDRATE TENDING TO TRANSFORM TO A DIFFERENT HYDRATE FORM IN THE PRESENCE OF WATER PRIOR TO DRYING BUT DRIED PRIOR TO TRANSFORMATION TO A DIFFERENT HYDRATE FORM, SAID PRECURSOR HYDRATE SUBSTANTIALLY FREE OF ALUMINA MONOHYDRATE AND ALUMINA TRIHYDRATE, SAID PRECURSOR HYDRATE UPON HEATING STARTING TO LOSE ITS WATER OF HYDRATION AT ABOUT 360*F. AND COMPLETING LOSS OF WATER OF HYDRATION AT ABOUT 930*F. AT WHICH TEMPERATURE IT CONTAINS LESS THAN ABOUT 3 PERCENT BY WEIGHT OF WATER.
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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) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |