US3431098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process improvements in the manufacture of complex fertilizers
Assignee: Potasse et Engrais Chimiques SA
•
Filing: 1966-03-11
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Granted: 1969-03-04
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Expires: 1986-03-11
Abstract
No abstract record available.
Inventors
- 👤 Honore Trimbach
- 👤 Pierre Dumont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:24
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN A PROCESS FOR THE PRODUCTION OF COMPLEX FERTILIZERS COMPRISING A NITRATE, A SULFATE ANDWATER-SOLUBLE P2O5, WHICH PROCESS COMPRISES DIGESTING PHOSPHATE ROCK WITH NITRIC ACID; ADDING SULFATE IONS IN ORDER TO FORM WATER-SOLUBLE P2O5; AND AMMONIATING THE DIGESTED REACTION MIXTURE, THE IMPROVEMENT IN SAID PROCESS COMPRISING: (A) AMMONIATING SAID DIGESTED REACTION MIXTURE TO A PH HIGHER THAN ABOUT 4.5; (B) ADDING SUFFICIENT SULFURIC ACID TO LOWER THE RESULTANT AMMONIATED REACTION MIXTURE OF STEP (A) TO A PH OF ABOUT 2-3; AND (C) RE-AMMONIATING THE RESSULTANT ACIDIFIED REACTION MIXTURE FROM STEP (B) TO A PH HIGHER THAN ABOUT 4.5; WHEREBY THERE ARE OBTAINED LESS VISCOUS REACTION MIXTURES AS COMPARED TO A PROCESS WEREIN STEPS (B) AND (C) ARE NOT INCLUDED.
Claim 2
Dependent Claim
119 words
IN A PROCESS FOR THE PRODUCTION OF COMPLEX FERTILIZERS COMPRISING A NITRATE, A SULFATE ANDWATER-SOLUBLE P2O5, WHICH PROCESS COMPRISES DIGESTING PHOSPHATE ROCK WITH NITRIC ACID; ADDING SULFATE IONS IN ORDER TO FORM WATER-SOLUBLE P2O5; AND AMMONIATING THE DIGESTED REACTION MIXTURE, THE IMPROVEMENT IN SAID PROCESS COMPRISING: (A) AMMONIATING SAID DIGESTED REACTION MIXTURE TO A PH HIGHER THAN ABOUT 4.5; (B) ADDING SUFFICIENT SULFURIC ACID TO LOWER THE RESULTANT AMMONIATED REACTION MIXTURE OF STEP (A) TO A PH OF ABOUT 2-3; AND (C) RE-AMMONIATING THE RESSULTANT ACIDIFIED REACTION MIXTURE FROM STEP (B) TO A PH HIGHER THAN ABOUT 4.5; WHEREBY THERE ARE OBTAINED LESS VISCOUS REACTION MIXTURES AS COMPARED TO A PROCESS WEREIN STEPS (B) AND (C) ARE NOT INCLUDED.
References Cited (Backward Citations)
US1856187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |