US3437475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous smelting and converting of copper concentrates to metallic copper
Assignee: Noranda Inc
•
Filing: 1965-01-04
•
Granted: 1969-04-08
•
Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Nickolas J Themelis
- 👤 Paul Spira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:31
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/0028; C22B15/003; C22B15/0041; C22B15/0043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US596991A
Cited
US813824A
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US1803663A
Cited
US1817043A
Cited
US2223569A
Cited
US2557650A
Cited
US3326671A
Cited
US3281236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |