Patent US3001100A successfully refreshed from Google Patents.
US2859952A
Expired / Lapsed
US
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Mining of taconite ores using high frequency magnetic energy
Assignee: Armco Inc
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Filing: 1951-09-08
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Granted: 1958-11-11
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Expires: 1971-09-08
Abstract
No abstract record available.
Inventors
- 👤 Tour Harry La
- 👤 Wren Howard Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:39
CPC Classifications
E; E21; E21C; E21C37/00; E21C37/18; E21C41/00; E21C41/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
THE METHOD OF FRACTURING TACONITE ORES WHEREIN PARTICLES OF MAGNETIC ION OXIDE ARE DISTRIBUTED THROUGHOUT THE MATRIX, WHICH INCLUDES THE STEPS OF SUBJECTING SAID MAGNATIC IRON OXIDE SELECTIVELY TO A FIELD OF HIGH FREQUENCY MAGNETIC ENERGY TO CAUSE VOLUMETRIC CHANGES RESULTING IN PORTIONS THEREOF BEING SUBJECTED TO TENSILE STRAINS BEYOND THE FRACTURE STRAIN THEREO, AND THATEAFTER MECHANICALLY BREAKING SAID ROCK INTO SMALL PIECES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |