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US3493109A
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Process and apparatus for electrostatically separating ores with charging of the particles by triboelectricity
Assignee: Consiglio Nazionale delle Richerche
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Filing: 1968-08-01
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Granted: 1970-02-03
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Expires: 1988-08-01
Abstract
No abstract record available.
Inventors
- 👤 Mario Carta
- 👤 Gianfranco Ferrara
- 👤 Clemente Delfa
- 👤 Raimondo Ciccu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:18
CPC Classifications
B; B03; B03C; B03C7/00; B03C7/006; B03C7/02; B03C7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2738067A
Cited
US2899055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |