US3554728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making non-hygroscopic ammonium phosphate
Assignee: FERTILIZER INDUSTRIES Inc
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Filing: 1968-08-05
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Granted: 1971-01-12
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Expires: 1988-08-05
Abstract
Abstract WET PROCESS PHOSPHORIC ACID IS REMOVED FROM AN ACIDIC SLUDGE WHICH SETTLES FROM THE CRUDE ACID AND IS CONCENTRATED TO SUPERPHOSPHORIC ACID. THE SUPERPHOSPHORIC ACID IS THEN MIXED WITH AQUEOUS AMMONIA AT A TEMPERATURE GREATER THAN 70*C. WHEREUPON THE MIXTURE IS THEN HELD AT 45-65*C. UNTIL AT LEAST 5% SOLIDS PRECIPITATE. THE PRECIPITATED SOLIDS ARE NEUTRALIZED TO PH 5-6 WITH THE ACIDIC SLUDGE TO PROVIDE NON-HYGROSCOPIC AMMONIUM PHOSPHATE. THE FILTRATE PROVIDES AN AMMONIUM POLYPHOSPHATE FERTILIZER SOLUTION WHICH DOES NOT PRECIPITATE MAGNESIUM-CONTAINING SOLIDS.
Inventors
- 👤 William Percy Moore
- 👤 James Earl Sansing
- 👤 Joseph Novotny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:03
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/06
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |