US2676705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of phosphate ores
Assignee: Attapulgus Minerals and Chemicals Corp
•
Filing: 1951-12-27
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Granted: 1954-04-27
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Expires: 1971-12-27
Abstract
No abstract record available.
Inventors
- 👤 James B Duke
- 👤 Wesley M Houston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:52
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/021; Y; Y10; Y10S; Y10S209/00; Y10S209/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |