US3739062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct conversion of dawsonite to pseudoboehmite
Assignee: CIT Group Business Credit Inc
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Filing: 1970-10-05
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Granted: 1973-06-12
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Expires: 1990-10-05
Abstract
Abstract DAWSONITE IN AQUEOUS SLURRY IS HYDROTHERMALLY TREATED TO OBTAIN PSEUDOBOEHMITE CHARACTERIZED Y A SURFACE AREA IN EXCESS OF 250 M.2/G. AND AN NA2O IMPURITY LEVEL OF LESS THAN 0.1% BY WEIGHT. THE PSEUCOBOEHMITE ISSUITABLE FOR THE PREPARATION OF CATALYST SUPPORTS DUE TO ITS HIGH SURFACE AREA, LOW IMPURITY LEVEL AND HIGH PORE VOLUME.
Inventors
- 👤 L Barsotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:20
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; C; C01; C01F; C01F7/00; C01F7/02; C01F7/021; C01P; C01P2006/00; C01P2006/12; C01P2006/14; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |