US2866546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined electrostatic and magnetic separator
Assignee: Research Cottrell Inc
•
Filing: 1957-02-06
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Granted: 1958-12-30
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Expires: 1977-02-06
Abstract
No abstract record available.
Inventors
- 👤 Lawrence M Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:38
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/18; B03; B03C; B03C1/00; B03C1/02; B03C1/035; B03C1/26; B03C1/30; B03C3/00; B03C3/017; B03C3/02; B03C3/04; B03C3/10; B03C3/34; B03C3/40; B03C3/41; B03C3/45; B03C3/49; B03C3/74; B03C3/743; B03C3/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-29 | 1962-06-30 | 1962-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-29 | 1966-06-30 | 1966-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-29 | 1970-06-30 | 1970-12-30 | $7700.00 | Window Closed / Lapsed |