US3049418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fertilizers
Assignee: Fisons Fertilizers Ltd
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Filing: 1960-06-15
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Granted: 1962-08-14
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Expires: 1980-06-15
Abstract
No abstract record available.
Inventors
- 👤 Brown Geoffrey George
- 👤 Wilson Roy Geoffrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:07
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A CONTINUOUS PROCESS FOR THE PRODUCTION OF A PHOSPHATE FERTILIZER, WHICH COMPRISES ACIDULATING PHOSPHATE ROCK WITH FROM 5 TO 15 MOLES OF NITRIC ACID PER MOLE OF P2O5 CONTAINED IN THE ROCK, ADDING POTASSIUM SULPHATE TO THE ACIDULATED PRODUCT AT SUCH A RATE THAT THE SOLUBLE SULPHATE CONCENTRATION IN THE LIQUID PHASE IS MAINTAINED WITHIN THE RANGE OF ABOUT 0.5 TO 8%, MAINTAINING THE REACTION TEMPERATURE IN THE RANGE OF ABOVE 90* AND UP TO 140* C. AND CONTINUOUSLY REMOVING THE REACTION PRODUCT FROM THE REACTION SYSTEM; WHEREBY SAID REACTION PRODUCT COMPRISES CALCIUM SULPHATE PREPONDERANTLY TO SUBSTANTIALLY ENTIRELY IN THE FORM OF ANHYDRITE.
Claim 2
Dependent Claim
103 words
A CONTINUOUS PROCESS FOR THE PRODUCTION OF A PHOSPHATE FERTILIZER, WHICH COMPRISES ACIDULATING PHOSPHATE ROCK WITH FROM 5 TO 15 MOLES OF NITRIC ACID PER MOLE OF P2O5 CONTAINED IN THE ROCK, ADDING POTASSIUM SULPHATE TO THE ACIDULATED PRODUCT AT SUCH A RATE THAT THE SOLUBLE SULPHATE CONCENTRATION IN THE LIQUID PHASE IS MAINTAINED WITHIN THE RANGE OF ABOUT 0.5 TO 8%, MAINTAINING THE REACTION TEMPERATURE IN THE RANGE OF ABOVE 90* AND UP TO 140* C. AND CONTINUOUSLY REMOVING THE REACTION PRODUCT FROM THE REACTION SYSTEM; WHEREBY SAID REACTION PRODUCT COMPRISES CALCIUM SULPHATE PREPONDERANTLY TO SUBSTANTIALLY ENTIRELY IN THE FORM OF ANHYDRITE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |