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US1279040A
Expired / Lapsed
US
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Method and apparatus for concentrating ores by flotation.
Assignee: Individual
•
Filing: 1916-06-28
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Granted: 1918-09-17
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Expires: 1936-06-28
Abstract
No abstract record available.
Inventors
- 👤 Carl C Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:46
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012
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) | 1921-09-16 | 1922-03-18 | 1922-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-09-16 | 1926-03-18 | 1926-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-09-16 | 1930-03-18 | 1930-09-17 | $7700.00 | Window Closed / Lapsed |