Patent US3389092A successfully refreshed from Google Patents.
US3389092A
Expired / Lapsed
US
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Process for preparing silica-alumina
Assignee: Sinclair Research Inc
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Filing: 1964-07-13
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Granted: 1968-06-18
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Expires: 1984-07-13
Abstract
No abstract record available.
Inventors
- 👤 Robert A Sanford
- 👤 Marvin F L Johnson
- 👤 Norman J Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:17
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/12; B01J35/00; B01J35/60; B01J35/61; B01J35/613; B01J37/00; B01J37/02; B01J37/0201; B01J37/0209
Claims Analysis
Total Claims: 0
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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) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |