US3689249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of pelletizing using copper-containing siliceous waste materials
Assignee: TENNESSEE CHEMICAL Co
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Filing: 1971-05-26
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Granted: 1972-09-05
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Expires: 1991-05-26
Abstract
Abstract FLOTATION MILL TAILINGS AND COPPER FURNACE SLAGS ARE COMBINED WITH IRON CALCINE TO FORM FIRED IRON PELLETS USED IN IRON MANUFACTURE. THESE FORMERLY DISCARDED WASTES ARE UTILIZED, AND IRON, COPPER AND ZINC VALUES PRESENT IN THE WASTES CAN BE RECOVERED.
Inventors
- 👤 Leonard R Judd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:52
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/2406; C22B1/242; C22B1/243; C22B15/00; C22B15/0026; C22B15/0054
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |