US3193348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing boehmite having crystal size in excess of 100 a
Assignee: Sinclair Research Inc
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Filing: 1962-02-19
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Granted: 1965-07-06
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 Mooi John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:20
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; B; B01; B01J; B01J21/00; B01J21/02; B01J21/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD OF PRODUCING CRYSTALLINE BOEHMITE HAVING A CRYSTAL SIZE IN EXCESS OF ABOUT 100 A. WHICH COMPRISES ADDING TO AN AQUEOUS ALUMINUM CHLORIDE SOLUTION MAINTAINED AT A TEMPERATURE OF ABOUT 150 TO 215*F., AN AQUEOUS SOLUTION OF AMMONIUM CARBONATE UNTIL AN EXCESS OF SAID AMMONIUM CARBONATE SOLUTION OVER THAT REQUIRED TO PRECIPITATE ALL OF THE ALUMINUM AS AL(OH)3 HAS BEEN ADDED AND REFLUXING THE RESULTANT MIXTURE TO OBTAIN CRYSTALLINE BOEHMITE HAVING A CRYSTAL SIZE IN EXCESS OF ABOUT 100 A.
Claim 2
Independent Claim
81 words
A METHOD OF PRODUCING CRYSTALLINE BOEHMITE HAVING A CRYSTAL SIZE IN EXCESS OF ABOUT 100 A. WHICH COMPRISES ADDING TO AN AQUEOUS ALUMINUM CHLORIDE SOLUTION MAINTAINED AT A TEMPERATURE OF ABOUT 150 TO 215*F., AN AQUEOUS SOLUTION OF AMMONIUM CARBONATE UNTIL AN EXCESS OF SAID AMMONIUM CARBONATE SOLUTION OVER THAT REQUIRED TO PRECIPITATE ALL OF THE ALUMINUM AS AL(OH)3 HAS BEEN ADDED AND REFLUXING THE RESULTANT MIXTURE TO OBTAIN CRYSTALLINE BOEHMITE HAVING A CRYSTAL SIZE IN EXCESS OF ABOUT 100 A.
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) | 1968-07-05 | 1969-01-04 | 1969-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-05 | 1973-01-04 | 1973-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-05 | 1977-01-04 | 1977-07-06 | $7700.00 | Window Closed / Lapsed |