Patent US2990124A successfully refreshed from Google Patents.
US2990124A
Expired / Lapsed
US
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System for separating magnetic susceptible particles
Assignee: Research Cottrell Inc
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Filing: 1957-08-16
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Granted: 1961-06-27
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Expires: 1977-08-16
Abstract
No abstract record available.
Inventors
- 👤 Patrick E Cavanagh
- 👤 Carl W Hedberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:43
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US704010A
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US1905780A
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US2045098A
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US2078513A
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US2175484A
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US2269912A
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US2307064A
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US2699871A
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US2692677A
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US2674413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |