US2668667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of coarse light minerals in multiple cyclone-separator stages
Assignee: Wyeth Holdings LLC
•
Filing: 1950-05-08
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Granted: 1954-02-09
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Expires: 1970-05-08
Abstract
No abstract record available.
Inventors
- 👤 Kenneth A Fern
- 👤 Charles F Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:39
CPC Classifications
B; B02; B02C; B02C21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2526519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |