US2478519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacturing silicabase gel catalysts which includes aging
Assignee: Wyeth Holdings LLC
•
Filing: 1945-01-16
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Granted: 1949-08-09
•
Expires: 1965-01-16
Abstract
No abstract record available.
Inventors
- 👤 Kenneth D Ashley
- 👤 Alphons O Jaeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:23
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/152; C01B33/154; B; B01; B01J; B01J21/00; B01J21/12; Y; Y10; Y10S; Y10S502/00; Y10S502/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1900859A
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US1958710A
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US2270090A
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US2326523A
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US2323583A
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US2326706A
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US2331473A
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US2280650A
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US2412958A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-08 | 1953-02-07 | 1953-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-08 | 1957-02-07 | 1957-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-08 | 1961-02-07 | 1961-08-09 | $7700.00 | Window Closed / Lapsed |