US3053622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Granular fertilizer
Assignee: International Minerals and Chemical Corp
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Filing: 1958-05-05
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Granted: 1962-09-11
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Expires: 1978-05-05
Abstract
No abstract record available.
Inventors
- 👤 Louis E Bostwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:16
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38; C01B25/40; C01B25/405; C01B25/28; C05; C05B; C05B7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
IN A PROCESS FOR THE PREPARATION OF GRANULAR AMMONIUM PHOSPHATE OF SUBSTANTIALLY UNIFORM PARTICLE SIZE FROM CONCENTRATED PHOSPHORIC ACID AND AN AMMONIA-CONTAINING FLUID, THE STEPS WHICH COMPRISE ADMIXING DESCRETE PARTICLES OF AMMONIUM PHOSPHATE OF A PARTICLE SIZE NOT LARGER THAN THE DESIRED PRODUCT WITH PHOSPHORIC ACID HAVING A P2O5 CONCENTRATION BETWEEN ABOUT 45 AND ABOUT 55% BY WEIGHT, THE WEIGHT RATIO OF P2O5 IN SAID PHOSPHORIC ACID TO SAID AMMONIUM PHOSPHATE PARTICLES BEING ABOUT 0.10:1 AND ABOUT 0.20:1, WHEREBY SUBSTANTIALLY DRY PARTICLES IMPREGNATED WITH SAID ACID ARE OBTAINED, SEPARATING THE IMPREGNATED PARTICLES INTO A COARSE FRACTION AND A FINE FRACTION, THE COARSE FRACTION APPROXIMATING THE PARTICLE SIZE OF THE DESIRE PRODUCT AND THE FINE FRACTION BEING SMALLER, RECYCLING THE FINE FRACTION TO THE MIXING OPERATION, AND, IN A ROLLING BED, AMMONIATING THE COARSE FRACTION WITH AN AMMONIA-CONTAINING FLUID IN AN AMOUNT AT LEAST SUFFICIENT TO FORM MONOAMMONIUM PHOSPHATE FROM SUBSTANTIALLY ALL OF THE FREE PHOSPHORIC ACID CONTAINED IN SAID COARSE FRACTION, WHEREBY A GRANULAR AMMONIUM PHOSPHATE PRODUCT IS OBTAINED HAVING THE DESIRED SUBSTANTIALLY UNIFORM PARTICLES SIZE.
Claim 2
Dependent Claim
176 words
IN A PROCESS FOR THE PREPARATION OF GRANULAR AMMONIUM PHOSPHATE OF SUBSTANTIALLY UNIFORM PARTICLE SIZE FROM CONCENTRATED PHOSPHORIC ACID AND AN AMMONIA-CONTAINING FLUID, THE STEPS WHICH COMPRISE ADMIXING DESCRETE PARTICLES OF AMMONIUM PHOSPHATE OF A PARTICLE SIZE NOT LARGER THAN THE DESIRED PRODUCT WITH PHOSPHORIC ACID HAVING A P2O5 CONCENTRATION BETWEEN ABOUT 45 AND ABOUT 55% BY WEIGHT, THE WEIGHT RATIO OF P2O5 IN SAID PHOSPHORIC ACID TO SAID AMMONIUM PHOSPHATE PARTICLES BEING ABOUT 0.10:1 AND ABOUT 0.20:1, WHEREBY SUBSTANTIALLY DRY PARTICLES IMPREGNATED WITH SAID ACID ARE OBTAINED, SEPARATING THE IMPREGNATED PARTICLES INTO A COARSE FRACTION AND A FINE FRACTION, THE COARSE FRACTION APPROXIMATING THE PARTICLE SIZE OF THE DESIRE PRODUCT AND THE FINE FRACTION BEING SMALLER, RECYCLING THE FINE FRACTION TO THE MIXING OPERATION, AND, IN A ROLLING BED, AMMONIATING THE COARSE FRACTION WITH AN AMMONIA-CONTAINING FLUID IN AN AMOUNT AT LEAST SUFFICIENT TO FORM MONOAMMONIUM PHOSPHATE FROM SUBSTANTIALLY ALL OF THE FREE PHOSPHORIC ACID CONTAINED IN SAID COARSE FRACTION, WHEREBY A GRANULAR AMMONIUM PHOSPHATE PRODUCT IS OBTAINED HAVING THE DESIRED SUBSTANTIALLY UNIFORM PARTICLES SIZE.
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) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |