Patent US3002932A successfully refreshed from Google Patents.
US3002932A
Expired / Lapsed
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Inorganic anion-exchangers and a process for their preparation
Assignee: 3M Co
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Filing: 1958-10-27
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Granted: 1961-10-03
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Expires: 1978-10-27
Abstract
No abstract record available.
Inventors
- 👤 Ernest J Duwell
- 👤 Joseph W Shepard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:15
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/08; B01J41/10; C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
AN ANION-EXCHANGER CONSISTING ESSENTIALLY OF A STABLE, SUBSTANTIALLY NON-CRYSTALLINE, SOLID, THREE-DIMENSIONAL RETICULATE STRUCTURE COMPOSED OF MIXED INSOLUBLE HYDRATED OXIDES OF A PAIR OF METALS SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, SILICON, TITANIUM, ZINC AND ZIRCONIUM, ONE MEMBER OF SAID PAIR BEING PRESENT IN AMOUNT AT LEAST ABOUT THREE TIMES THE MOLAR AMOUNT OF THE OTHER MEMBER OF SAID PAIR AND HAVING A POSITIVE VALENCE NUMBER IN THE OXIDE STATE LOWER BY UNITY THAN THE OTHER MEMBER OF SAID PAIR, THE HIGHER VALENT MEMBER OF SAID PAIR BEING PRESENT IN AN AMOUNT OF AT LEAST 1 ATOM PERCENT, TOGETHER WITH AN AMOUNT OF BOUND ANION SUFFICIENT TO BALANCE THE CHARGE OF THE HIGHER VALENT MEMBER OF SAID PAIR.
Claim 2
Dependent Claim
118 words
AN ANION-EXCHANGER CONSISTING ESSENTIALLY OF A STABLE, SUBSTANTIALLY NON-CRYSTALLINE, SOLID, THREE-DIMENSIONAL RETICULATE STRUCTURE COMPOSED OF MIXED INSOLUBLE HYDRATED OXIDES OF A PAIR OF METALS SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, SILICON, TITANIUM, ZINC AND ZIRCONIUM, ONE MEMBER OF SAID PAIR BEING PRESENT IN AMOUNT AT LEAST ABOUT THREE TIMES THE MOLAR AMOUNT OF THE OTHER MEMBER OF SAID PAIR AND HAVING A POSITIVE VALENCE NUMBER IN THE OXIDE STATE LOWER BY UNITY THAN THE OTHER MEMBER OF SAID PAIR, THE HIGHER VALENT MEMBER OF SAID PAIR BEING PRESENT IN AN AMOUNT OF AT LEAST 1 ATOM PERCENT, TOGETHER WITH AN AMOUNT OF BOUND ANION SUFFICIENT TO BALANCE THE CHARGE OF THE HIGHER VALENT MEMBER OF SAID PAIR.
Claim 3
Dependent Claim
101 words
THE PROCESS FOR THE PREPARATION OF AN ANION-EXCHANGER WHICH COMPRISES COPRECIPITATING MIXED HYDRATED OXIDES OF A PAIR OF ELEMENTS CHOSEN FROM THE GROUP CONSISTING OF ALUMINUM, SILICON, TITANIUM, ZINC AND ZIRCONIUM IN AN AQUEOUS MEDIUM AT A PH IN THE RANGE OF ABOUT PH 5 TO 7, THE LOWER-VALENT MEMBER OF SAID PAIR BEING PRESENT IN AMOUNT AT LEAST ABOUT THREE AND NOT MORE THAN NINETY-NINE TIMES THE MOLAR AMOUNT OF THE HIGHER-VALENT MEMBER OF SAID PAIR, DRYING THE AQUEOUS MIXTURE BY EVAPORATION AT A TEMPERATURE BELOW ABOUT 150*C., AND WASHING THE DRIED MIXTURE WITH WATER TO REMOVE SOLUBLE IMPURITIES THEREFROM.
Claim 4
Dependent Claim
101 words
THE PROCESS FOR THE PREPARATION OF AN ANION-EXCHANGER WHICH COMPRISES COPRECIPITATING MIXED HYDRATED OXIDES OF A PAIR OF ELEMENTS CHOSEN FROM THE GROUP CONSISTING OF ALUMINUM, SILICON, TITANIUM, ZINC AND ZIRCONIUM IN AN AQUEOUS MEDIUM AT A PH IN THE RANGE OF ABOUT PH 5 TO 7, THE LOWER-VALENT MEMBER OF SAID PAIR BEING PRESENT IN AMOUNT AT LEAST ABOUT THREE AND NOT MORE THAN NINETY-NINE TIMES THE MOLAR AMOUNT OF THE HIGHER-VALENT MEMBER OF SAID PAIR, DRYING THE AQUEOUS MIXTURE BY EVAPORATION AT A TEMPERATURE BELOW ABOUT 150*C., AND WASHING THE DRIED MIXTURE WITH WATER TO REMOVE SOLUBLE IMPURITIES THEREFROM.
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) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |