US2440542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Volatile fluoride recovery
Assignee: Standard Oil Co
•
Filing: 1942-07-17
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Granted: 1948-04-27
•
Expires: 1962-07-17
Abstract
No abstract record available.
Inventors
- 👤 Everett C Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:21
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; C; C01; C01B; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2109340A
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US2148115A
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US2160576A
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US2196363A
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US2167358A
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US2282712A
Cited
US2284554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-27 | 1951-10-27 | 1952-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-27 | 1955-10-27 | 1956-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-27 | 1959-10-27 | 1960-04-27 | $7700.00 | Window Closed / Lapsed |