US2474831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for defluorinating phosphate rock
Assignee: Tennessee Valley Authority
•
Filing: 1947-11-28
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Granted: 1949-07-05
•
Expires: 1967-11-28
Abstract
No abstract record available.
Inventors
- 👤 Kelly L Elmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:07
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/02; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1411696A
Cited
US1803417A
Cited
US2093176A
Cited
US2189248A
Cited
GB487265A
Cited
US2220575A
Cited
US2395231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |