US2738265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of carbonated nitric phosphate fertilizer
Assignee: Tennessee Valley Authority
•
Filing: 1953-05-25
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Granted: 1956-03-13
•
Expires: 1973-05-25
Abstract
No abstract record available.
Inventors
- 👤 Francis T Nielsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:36
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A PROCESS FOR MAKING FERTILIZER WHICH COMPRISES THE STEPS OF EXTRACTING PHOSPHATE ROCK WITH NITRIC ACID, TREATING THE EXACT SLURRY WITH SUFFICIENT AMMONIA TO PRECIPITABLE SUBSTANTIALLY ALL THE P2O5 AS DICALCIUM PHOSPHATE, AND THEREAFTER TREATING THE SLURRY WITH SIMULTANEOUS ADDITION OF AMMONIA AND CARBON DIOXIDE TO CONVERT CALCIUM NITRATE TO AMMONIA AND CARBON DIOXIDE TO CONVERT CALCIUM IMPROVEMENT THAT COMPRISES ADDING TO THE SLURRY, BEFORE ITS NH3/NO3 MOLE RATIO BECOMES 0.5, A MATERIAL SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID, AMMONIUM SULFATE, POTASSIUM SULFATE, MAGNESIUM SULFATE, CALCIUM SULFATE, AND SODIUM SULFATE, GYPSUM, GLASERITE, LANGBEINITE, KAINITE, AND MIXTURES THEREOF, THE AMOUNT OF SAID
Claim 2
Dependent Claim
104 words
IN A PROCESS FOR MAKING FERTILIZER WHICH COMPRISES THE STEPS OF EXTRACTING PHOSPHATE ROCK WITH NITRIC ACID, TREATING THE EXACT SLURRY WITH SUFFICIENT AMMONIA TO PRECIPITABLE SUBSTANTIALLY ALL THE P2O5 AS DICALCIUM PHOSPHATE, AND THEREAFTER TREATING THE SLURRY WITH SIMULTANEOUS ADDITION OF AMMONIA AND CARBON DIOXIDE TO CONVERT CALCIUM NITRATE TO AMMONIA AND CARBON DIOXIDE TO CONVERT CALCIUM IMPROVEMENT THAT COMPRISES ADDING TO THE SLURRY, BEFORE ITS NH3/NO3 MOLE RATIO BECOMES 0.5, A MATERIAL SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID, AMMONIUM SULFATE, POTASSIUM SULFATE, MAGNESIUM SULFATE, CALCIUM SULFATE, AND SODIUM SULFATE, GYPSUM, GLASERITE, LANGBEINITE, KAINITE, AND MIXTURES THEREOF, THE AMOUNT OF SAID
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) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |