Patent US2869633A successfully refreshed from Google Patents.
Patent US3207580A successfully refreshed from Google Patents.
US3207580A
Expired / Lapsed
US
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Preparation of wet process phosphoric acid
Assignee: Wyeth Holdings LLC
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Filing: 1962-04-13
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Granted: 1965-09-21
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Expires: 1982-04-13
Abstract
No abstract record available.
Inventors
- 👤 Harry F Cosway
- 👤 Sydney A Giddings
- 👤 Thomas J Malley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:02
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN AN IMPROVED PROCESS FOR PREPARING HIGH-GRADE PHOSPHORIC ACID USEFUL AS AN ANIMAL FEED SUPPLEMENT OF HIGH NUTRITIONAL AVAILABILITY IN ITS NEUTRALIZED CALCIUM SALT, THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY IN; HEATTREATING TRIPLE SUPERPHOSPHATE CONTAINING MORE THAN ONE PERCENT FLUROINE AT A TEMPERATURE BETWEEN 1050*F. AND 1350*F. FOR FROM ABOUT TEN MINUTES TO ABOUT ONE HOUR TO EFFECT THE REDUCTION OF FLUORINE CONTENT OF SAID TRIPLE SUPERPHOSPHATE TO LESS THAN ABOUT 0.2%, ACIDIFYING THE SO-CALCINED TRIPLE SUPERPHOSPHATE TO ITS CORRESPONDING FREE AID FORM, SAID ACIDIFICATION STEP BEING CARRIED OUT IN THE PRESENCE OF AT LEAST STOICHIOMETRIC AMOUNTS OF CONCENTRATED SULFURIC ACID IN RELATION TO THE CALCIUM CONTENT OF THE DEFLUORINATED PRODUCT AND RECOVERING A PHOSPHORIC ACID OF MORE THAN ABOUT 25% P2O5 BY WEIGHT AND A FLUORINE CONTENT OF LESS THAN ABOUT 0.2%.
Claim 2
Dependent Claim
132 words
IN AN IMPROVED PROCESS FOR PREPARING HIGH-GRADE PHOSPHORIC ACID USEFUL AS AN ANIMAL FEED SUPPLEMENT OF HIGH NUTRITIONAL AVAILABILITY IN ITS NEUTRALIZED CALCIUM SALT, THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY IN; HEATTREATING TRIPLE SUPERPHOSPHATE CONTAINING MORE THAN ONE PERCENT FLUROINE AT A TEMPERATURE BETWEEN 1050*F. AND 1350*F. FOR FROM ABOUT TEN MINUTES TO ABOUT ONE HOUR TO EFFECT THE REDUCTION OF FLUORINE CONTENT OF SAID TRIPLE SUPERPHOSPHATE TO LESS THAN ABOUT 0.2%, ACIDIFYING THE SO-CALCINED TRIPLE SUPERPHOSPHATE TO ITS CORRESPONDING FREE AID FORM, SAID ACIDIFICATION STEP BEING CARRIED OUT IN THE PRESENCE OF AT LEAST STOICHIOMETRIC AMOUNTS OF CONCENTRATED SULFURIC ACID IN RELATION TO THE CALCIUM CONTENT OF THE DEFLUORINATED PRODUCT AND RECOVERING A PHOSPHORIC ACID OF MORE THAN ABOUT 25% P2O5 BY WEIGHT AND A FLUORINE CONTENT OF LESS THAN ABOUT 0.2%.
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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |