Patent US2428895A successfully refreshed from Google Patents.
US2428895A
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Method of making silica containing gels
Assignee: Davison Chemical Corp
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Filing: 1944-07-26
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Granted: 1947-10-14
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Expires: 1964-07-26
Abstract
No abstract record available.
Inventors
- 👤 Shoeld Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:27
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0056; B01J13/006; C; C01; C01B; C01B33/00; C01B33/113
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR612315A
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DE504498C
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US1769181A
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US1706722A
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US2232727A
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US2302297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |