US1286532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating copper ores by sulfitization and flotation.
Assignee: METALLURGIC IMPROVEMENT Corp
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Filing: 1918-04-03
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Granted: 1918-12-03
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Expires: 1938-04-03
Abstract
No abstract record available.
Inventors
- 👤 Niels C Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:48
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; C; C22; C22B; C22B1/00; Y; Y10; Y10S; Y10S209/00; Y10S209/901
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) | 1921-12-02 | 1922-06-03 | 1922-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-12-02 | 1926-06-03 | 1926-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-12-02 | 1930-06-03 | 1930-12-03 | $7700.00 | Window Closed / Lapsed |