US2462236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of silica hydrogel and catalysts
Assignee: Universal Oil Products Co
•
Filing: 1945-07-30
•
Granted: 1949-02-22
•
Expires: 1965-07-30
Abstract
No abstract record available.
Inventors
- 👤 Charles L Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:50
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/152; C01B33/154; B; B01; B01J; B01J21/00; B01J21/06; B01J21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2249613A
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US2331353A
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US2326706A
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US2339247A
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US2339249A
Cited
US2339250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-22 | 1952-08-23 | 1953-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-22 | 1956-08-23 | 1957-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-22 | 1960-08-23 | 1961-02-22 | $7700.00 | Window Closed / Lapsed |