Patent US4428385A successfully refreshed from Google Patents.
Patent US2859952A successfully refreshed from Google Patents.
US2859952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining of taconite ores using high frequency magnetic energy
Assignee: Armco Inc
•
Filing: 1951-09-08
•
Granted: 1958-11-11
•
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 19:31
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.
References Cited (Backward Citations)
US44986A
Cited
US309766A
Cited
US502181A
Cited
US561367A
Cited
US1401445A
Cited
US918321A
Cited
US1383963A
Cited
US1640524A
Cited
US1830934A
Cited
US1679857A
Cited
US1631290A
Cited
US2106869A
Cited
US2286191A
Cited
US2308860A
Cited
US2517425A
Cited
US2444259A
Cited
US2571643A
Cited
US2628785A
Cited
US2601421A
Cited
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 |