US3124419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of phosphoric acid
Assignee: —
•
Filing: —
•
Granted: 1964-03-10
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Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:31
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/237; C01B25/22; C01B25/222; C01B25/223; C01B25/225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
IN A PROCESS FOR THE MANUFACTURE OF PHOSPHORIC ACID COMPRISING REACTING CALCIUM PHOSPHATE WITH AN AQUEOUS SOLUTION OF SULFURIC ACID TO PRODUCE A SUSPENSION OF CALCIUM SULFATE IN PHOSPHORIC ACID CONTAINING FROM 250 TO 450 GRAMS OF P2O5 PER LITER, THE SULFURIC ACID BEING REACTED IN EXCESS SUCH THAT SAID SUSPENSION CONTAINS FROM 10 TO 50 GRAMS PER LITER OF SULFURIC ACID, THE IMPROVEMENT COMPRISING PURIFYING SAID PHOSPHORIC ACID BY SEPARATING A PHOSPHORIC ACID CONTAINING SOLUTION FROM THE CALCIUM SULFATE PRECIPITATED DURING THE REACTION; ADMIXING SAID SOLUTION WITH (1) A CALCIUM COMPOUND THE CALCIUM SULFATE PRECIPITATED DURING THE REACTION: IN AN AMOUNT AT LEAST EQUAL TO THE STOICHIOMETRIC QUANTITY REQUIRED FOR REACTION WITH THE SULFURIC ACID PRESENT IN SAID SOLUTION TO PRODUCE CALCIUM SULFATE, AND (2) A PRECIPITATING AGENT COMPRISING CRYSTALLINE CALCIUM SULFATE DIHYDRATE IN AN AMOUNT OF AT LEAST 50 GRAMS PER LITER OF SAID SOLUTION;
Claim 2
Dependent Claim
147 words
IN A PROCESS FOR THE MANUFACTURE OF PHOSPHORIC ACID COMPRISING REACTING CALCIUM PHOSPHATE WITH AN AQUEOUS SOLUTION OF SULFURIC ACID TO PRODUCE A SUSPENSION OF CALCIUM SULFATE IN PHOSPHORIC ACID CONTAINING FROM 250 TO 450 GRAMS OF P2O5 PER LITER, THE SULFURIC ACID BEING REACTED IN EXCESS SUCH THAT SAID SUSPENSION CONTAINS FROM 10 TO 50 GRAMS PER LITER OF SULFURIC ACID, THE IMPROVEMENT COMPRISING PURIFYING SAID PHOSPHORIC ACID BY SEPARATING A PHOSPHORIC ACID CONTAINING SOLUTION FROM THE CALCIUM SULFATE PRECIPITATED DURING THE REACTION; ADMIXING SAID SOLUTION WITH (1) A CALCIUM COMPOUND THE CALCIUM SULFATE PRECIPITATED DURING THE REACTION: IN AN AMOUNT AT LEAST EQUAL TO THE STOICHIOMETRIC QUANTITY REQUIRED FOR REACTION WITH THE SULFURIC ACID PRESENT IN SAID SOLUTION TO PRODUCE CALCIUM SULFATE, AND (2) A PRECIPITATING AGENT COMPRISING CRYSTALLINE CALCIUM SULFATE DIHYDRATE IN AN AMOUNT OF AT LEAST 50 GRAMS PER LITER OF SAID SOLUTION;
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) | 1967-03-10 | 1967-09-09 | 1968-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-10 | 1971-09-09 | 1972-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-10 | 1975-09-09 | 1976-03-10 | $7700.00 | Window Closed / Lapsed |