US3733191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of ammonium polyphosphate
Assignee: Tennessee Valley Authority
•
Filing: 1970-02-13
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Granted: 1973-05-15
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Expires: 1990-02-13
Abstract
Abstract PROCESS FOR THE PRODUCTION OF HIGH-ANALYSIS SOLID AND LIQUID (SOLUTIONS AND SUSPENSIONS) AMMONIUM POLYPHOSPHATE FERTILIZERS OF HIGH P2O5 POLYPHOSPHATE AND AVAILABILITY LEVELS FROM WET-PROCESS PHOSPHORIC ACID AND AMMONIA. THE ACID IS AMMONIATED SO THAT FIXATION OF AMMONIA, DEHYDRATION OF THE ACID, AND FORMATION OF POLYPHOSPHATE OCCUR SIMULTANEOUSLY. THE POLYPHOSPHATE CONTENT IS MAINTAINED AT A HIGH LEVEL BY DISPERSAL OF TE POLYPHOSPHATE FOAM IN A DISENGAGING VESSEL OF DESIGN TO ALLOW ESCAPE OF FREE WATER ENTRAPPED IN THE FOAM PRIOR TO REDUCTION IN TEMPERATURE AND THEREBY PREVENTING HYDROLYSIS OF THE PHOSPHATE WITH THE ENTRAPPED WATER.
Inventors
- 👤 R Meline
- 👤 R Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:31
CPC Classifications
C; C05; C05B; C05B13/00
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |