Patent US3572990A successfully refreshed from Google Patents.
US3572990A
Expired / Lapsed
US
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Ammonium polyphosphate produced at atmospheric pressure
Assignee: Tennessee Valley Authority
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Filing: 1970-02-27
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Granted: 1971-03-30
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Expires: 1990-02-27
Abstract
Abstract A PROCESS FOR THE PREPARATION OF AMMONIUM POLYPHOSPHATE BY THE AMMONIATION OF POLYPHOSPHORIC ACIDS CONTAINING MORE THAN 80 PERCENT P2O5 WITH CONCURRENT HYDROLYSIS OF THE OBJECTIONABLE LONG-CHAIN PHOSPHATE SPECIES. AN INTERMEDIATE AQUEOUS SLURRY, PH 7.4 TO 8.9, IS PREPARED AT 50* TO 110*C. AND PROCESSED FURTHER TO PRODUCE GRANULAR SOLDS, WITH GOOD PHYSICAL PROPERTIES, THE CONTAIN IN APPROXIMATELY EQUAL PROPORTIONS AMMONIUM ORTHO-, PYRO-, AND TRIPOLYPHOSPHATES.
Inventors
- 👤 Thad D Farr
- 👤 Henry K Walters Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:45
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/28; C01B25/38; C01B25/40; C01B25/405
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |