Patent US2203157A successfully refreshed from Google Patents.
US2776828A
Expired / Lapsed
US
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Pelletization of phosphate shale
Assignee: FMC Corp
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Filing: 1953-02-27
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Granted: 1957-01-08
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Expires: 1973-02-27
Abstract
No abstract record available.
Inventors
- 👤 Manley C Marcellus
- 👤 Woodward Teynham
- 👤 Work Josiah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:01
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
THE METHOD OF PREPARING AN ELECTRIC PHOSPHATE FURNACE FEED FROM WHOLE PHOSPHATE SHALE AS MINED AND CRUSHED TO MINUS 3 INCH SIZE BY INCREASING THE CLAYEY CONTENT OF THE FINE FRACTION TO PERMIT PELIETIZING THEREOF, WHICH COMPRISES SCREENING SAID SHALE TO PRODUCE A FINE PARTICLE SIZE FRACTION CONTAINING THE LARGER AMOUNT OF THE CLAYEY MATERIAL AND A COARSE PARTICLE SIZE FRACTION SUBSTANTIALLY FREE FROM DUST AND CONTAINING A SMALLER AMOUNT OF CLAYEY MATERIAL, CALCINING THE COARSE FRACTION TO PRODUCE ELECTRIC SMELTING FURNACE FEED THEREFROM, MOISTENING, PELLETIZING AND DRYING THE FINE PARTICLE SIZE FRACTION AND PASSING THE SAID PELLETS THROUGH A ROTARY KILN OPERATED AT A TEMPERATURE ABOVE APPROXIMATELY 1050*C. TO PRODUCE A PELLETIZED ELECTRIC SMELTING FURNACE FEED THEREFROM.
Claim 2
Independent Claim
118 words
THE METHOD OF PREPARING AN ELECTRIC PHOSPHATE FURNACE FEED FROM WHOLE PHOSPHATE SHALE AS MINED AND CRUSHED TO MINUS 3 INCH SIZE BY INCREASING THE CLAYEY CONTENT OF THE FINE FRACTION TO PERMIT PELIETIZING THEREOF, WHICH COMPRISES SCREENING SAID SHALE TO PRODUCE A FINE PARTICLE SIZE FRACTION CONTAINING THE LARGER AMOUNT OF THE CLAYEY MATERIAL AND A COARSE PARTICLE SIZE FRACTION SUBSTANTIALLY FREE FROM DUST AND CONTAINING A SMALLER AMOUNT OF CLAYEY MATERIAL, CALCINING THE COARSE FRACTION TO PRODUCE ELECTRIC SMELTING FURNACE FEED THEREFROM, MOISTENING, PELLETIZING AND DRYING THE FINE PARTICLE SIZE FRACTION AND PASSING THE SAID PELLETS THROUGH A ROTARY KILN OPERATED AT A TEMPERATURE ABOVE APPROXIMATELY 1050*C. TO PRODUCE A PELLETIZED ELECTRIC SMELTING FURNACE FEED THEREFROM.
References Cited (Backward Citations)
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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) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |