US2111789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of sulphide ores
Assignee: Freeport Minerals Corp
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Filing: 1934-10-15
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Granted: 1938-03-22
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Expires: 1954-10-15
Abstract
No abstract record available.
Inventors
- 👤 Charles R Kuzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:32
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0006; C21B2100/00; C21B2100/20; C21B2100/28; C21B2100/284; C21B2100/40; C21B2100/42; C21B2100/60; C21B2100/66; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y02P10/25
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) | 1941-03-21 | 1941-09-20 | 1942-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-03-21 | 1945-09-20 | 1946-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-03-21 | 1949-09-20 | 1950-03-22 | $7700.00 | Window Closed / Lapsed |