US2479389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defluorination of phosphate rock
Assignee: CORENST PHOSPHATE Co
•
Filing: 1946-04-26
•
Granted: 1949-08-16
•
Expires: 1966-04-26
Abstract
No abstract record available.
Inventors
- 👤 Ernest J Maust
- 👤 Clinton A Hollngsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:44
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1032763A
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US1396149A
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US1902832A
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GB418788A
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GB424045A
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US2093176A
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US2189248A
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US2162609A
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US2283174A
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US2279033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-15 | 1953-02-14 | 1953-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-15 | 1957-02-14 | 1957-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-15 | 1961-02-14 | 1961-08-16 | $7700.00 | Window Closed / Lapsed |