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US2678130A
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Method and apparatus for demagnetizing magnetic ores having high coercive force
Assignee: University of Minnesota Twin Cities
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Filing: 1950-05-29
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Granted: 1954-05-11
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Expires: 1970-05-29
Abstract
No abstract record available.
Inventors
- 👤 Nordahl L Onstad
- 👤 Norman J Foot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:00
CPC Classifications
B; B03; B03B; B03B1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1286247A
Cited
US2072907A
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US2154399A
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US2206980A
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US2276075A
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US2325149A
Cited
US2378388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |