Patent US3032408A successfully refreshed from Google Patents.
US3032408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of pelletizing phosphate rock
Assignee: International Minerals and Chemical Corp
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Filing: 1957-08-05
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Granted: 1962-05-01
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Expires: 1977-08-05
Abstract
No abstract record available.
Inventors
- 👤 Arthur N Baumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:44
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/12; C; C01; C01B; C01B25/00; C01B25/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
THE METHOD OF PREPARING PELLETS FROM PHOSPHATE ROCK PARTICLES WHICH COMPRISES THE STEPS OF ADMIXING PHOSPHATE ROCK PARTICLES, WATER, AND AT LEAST ONE ALKALI METAL METAPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL METAPHOSPHATES, ALKALI METAL POLYMETAPHOSPHATES, AND MIXTURES THEREOF, SAID ALKALI METAL METAPHOSPHATE BEING ADDED TO SAID MIXTURE IN AN AMOUNT EQUIVALENT TO BETWEEN ABOUT 5 AND ABOUT 50 POUNDS PER 2000 POUNDS OF PHOSPHATE ROCK, SAID WATER BEING ADDED TO THE MIXTURE IN AN AMOUNT SUFFICIENT TO PROVIDE A TOTAL MOISTURE CONTENT OF BETWEEN ABOUT 10% AND ABOUT 20%, TUMBLING SAID MIXTURE IN A ROTATING PELLETIZER TO PRODUCE MOIST PELLETS OF PHOSPHATE ROCK PARTICLES BOUND TOGETHER, SAID PELLETS HAVING A PARTICLE SIZE OF PLUS 8 MESH, AND SLOWLY HEATING THE MOIST PELLETS TO A TEMPERATURE IN EXCESS OF ABOUT 230*F. TO REMOVE SUBSTANTIALLY ALL OF THE WATER FROM THE PELLETS.
Claim 2
Independent Claim
143 words
THE METHOD OF PREPARING PELLETS FROM PHOSPHATE ROCK PARTICLES WHICH COMPRISES THE STEPS OF ADMIXING PHOSPHATE ROCK PARTICLES, WATER, AND AT LEAST ONE ALKALI METAL METAPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL METAPHOSPHATES, ALKALI METAL POLYMETAPHOSPHATES, AND MIXTURES THEREOF, SAID ALKALI METAL METAPHOSPHATE BEING ADDED TO SAID MIXTURE IN AN AMOUNT EQUIVALENT TO BETWEEN ABOUT 5 AND ABOUT 50 POUNDS PER 2000 POUNDS OF PHOSPHATE ROCK, SAID WATER BEING ADDED TO THE MIXTURE IN AN AMOUNT SUFFICIENT TO PROVIDE A TOTAL MOISTURE CONTENT OF BETWEEN ABOUT 10% AND ABOUT 20%, TUMBLING SAID MIXTURE IN A ROTATING PELLETIZER TO PRODUCE MOIST PELLETS OF PHOSPHATE ROCK PARTICLES BOUND TOGETHER, SAID PELLETS HAVING A PARTICLE SIZE OF PLUS 8 MESH, AND SLOWLY HEATING THE MOIST PELLETS TO A TEMPERATURE IN EXCESS OF ABOUT 230*F. TO REMOVE SUBSTANTIALLY ALL OF THE WATER FROM THE PELLETS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |