US3595610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of ammonium phosphates
Assignee: ExxonMobil Upstream Research Co
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Filing: 1968-11-14
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Granted: 1971-07-27
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Expires: 1988-11-14
Abstract
Abstract A PROCESS FOR THE MANUFACTURE OF AN AMMONIUM PHOSPHATE FERTILIZER WHEREIN GYPSUM, PHOSPHOGYPSUM, ANHYDRITE OR A SIMILAR CALCIUM SULFATE IS REACTED WITH AMMONIUM CARBONATE OR AMMONIA AND CARBON DIOXIDE TO PRODUCE AMMONIUM SULFATE; THE AMMONIUM SULFATE IS CONTACTED WITH A HYDROGEN ION EXCHANGE RESIN TO FORM SULFURIC ACID WHICH IN TURN IS REACTED WITH PHOSPHATE ROCK OR THE LIKE TO PRODUCE PHOSPHORIC ACID; AND THIS PHOSPHORIC ACID IS THEN USED FOR REGENERATION OF THE ION EXCHANGE RESIN AND THE FORMATION OF AMMONIUM PHOPHATE.
Inventors
- 👤 Fred H Brinkman
- 👤 Robert E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:09
CPC Classifications
C; C05; C05B; C05B7/00; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/745; C01B25/00; C01B25/16; C01B25/26; C01B25/28; C01B25/38; C01B25/40; C01B25/405
Claims Analysis
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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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |