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US3405802A
Expired / Lapsed
US
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Flotation of apatite
Assignee: Phosphate Development Corp Ltd
•
Filing: 1965-07-08
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Granted: 1968-10-15
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Expires: 1985-07-08
Abstract
No abstract record available.
Inventors
- 👤 Preller Gustav Schoeman
- 👤 Schoeman Barend Jacobus Klerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:18
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2069182A
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US2385054A
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US2433258A
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US2442455A
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US2607486A
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US2944666A
Cited
US3067875A
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US3164549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-15 | 1972-04-15 | 1972-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-15 | 1976-04-15 | 1976-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-15 | 1980-04-15 | 1980-10-15 | $7700.00 | Window Closed / Lapsed |