US3745102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation recovery of zinc sulphide from ore
Assignee: Unisearch Ltd
•
Filing: 1971-11-30
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Granted: 1973-07-10
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Expires: 1991-11-30
Abstract
Abstract THE INVENTION RELATES FLOATION RECOVERY OF ZINC SULPHIDE FROM A SLURRY CONTAINING ZINC SULPHIDE BEARING ORE IN GROUND FORM BY ADDING TO THE SLURRY A COLLECTOR AND THEN A FROTHING AGENT AND PASSING A DIRECT CURRENT FROM A LOW VOLTAGE SOURCE BETWEEN COPPER ELECTRODES THROUGH THE SLURRY.
Inventors
- 👤 B Banerji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:52
CPC Classifications
B; B03; B03B; B03B1/00; B03D; B03D1/00; B03D1/02; B03D1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |