Patent US3594150A successfully refreshed from Google Patents.
US3594150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of solid mixed fertilizers and ammonium nitrate
Assignee: LaRoche Industries Inc
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Filing: 1968-06-27
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Granted: 1971-07-20
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Expires: 1988-06-27
Abstract
Abstract IN A PROCESS WHEREIN PHOSPHATE ROCK IS DIGESTED WITH NITRIC ACID AND AMMONIUM SULFATE, AND PRECIPITATED GYPSUM REMOVED, WATER-SOLUBLE LOW N:P2O5 RATIO MIXED FERTILIZERS AND AMMONIUM NITRATE ARE PRODUCED BY CRYSTALLIZING AND SEPARATING AMMONIUM NITRATE FROM THE CONCENTRATED MOTHER LIQUOR CONTAINING THE AMMONIUM NITRATE AND PHOSPHORIC ACID AND THEN AMMONIATING THE LIQUOR CONTAINING THE PHOSPHORIC ACID AND UNCRYSTALLIZED AMMONIUM NITRATE. THE GYPSUM AFTER REMOVAL FROM THE DIGESTION SLURRY MAY BE CONVERTED TO AMMONIUM SULFATE BY AN AMMONIATION-CARBONATION REACTION FOR RECYCLE TO THE DIGESTION STEP.
Inventors
- 👤 Raybon C Cannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:57
CPC Classifications
C; C05; C05C; C05C1/00; C05B; C05B7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |