Patent US2504544A successfully refreshed from Google Patents.
US2504544A
Expired / Lapsed
US
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Process of manufacturing phosphoric acid
Assignee: Davison Chemical Corp
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Filing: 1947-01-28
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Granted: 1950-04-18
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Expires: 1967-01-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Casimer C Legal
- 👤 Thomas O Tongue
- 👤 Edward H Wight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:34
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22; C01B25/222; C01B25/232; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS FOR THE MANUFACTURE OF CONCENTRATED PHOSPHORIC ACID IN CONCENTRATIONS UP TO 75% H3P04 HAVING A LOW FLUORINE CONTENT COMPRISING MIXING FINELY DIVIDED PHOSPHATE ROCK WITH ABOUT 98% SULPHURIC ACID IN AN ACID TO ROCK RATIO RANGING FROM A VALUE AT LEAST HIGH ENOUGH TO A VALUE SLIGHTLY IN EXCESS OF THAT NECESSARY TO REACT WITH ALL SULPHURIC ACID REACTIBLE COMPOUNDS IN THE ROCK AND FORM PHOSPHORIC ACID FROM THE CALCIUM PHOSPHATE IN THE ROCK, HEATING THE MIXTURE OF ROCK AND ACID TO A TEMPERATURE RANGING FROM ABOUT 200*C. TO 300*C. TO FORM A CLINKER, SAID MIXING AND HEATING STEPS VOLATILIZING ABOUT 90% OF THE FLUORINE IN THE PHOSPHATE ROCK TO FORM A CLINKER SUBSTANTIALLY FREE OF FLUORINE, AND LEACHING THE CLINKER WITH WATER TO FORM PHOSPHORIC ACID.
Claim 2
Dependent Claim
129 words
A PROCESS FOR THE MANUFACTURE OF CONCENTRATED PHOSPHORIC ACID IN CONCENTRATIONS UP TO 75% H3P04 HAVING A LOW FLUORINE CONTENT COMPRISING MIXING FINELY DIVIDED PHOSPHATE ROCK WITH ABOUT 98% SULPHURIC ACID IN AN ACID TO ROCK RATIO RANGING FROM A VALUE AT LEAST HIGH ENOUGH TO A VALUE SLIGHTLY IN EXCESS OF THAT NECESSARY TO REACT WITH ALL SULPHURIC ACID REACTIBLE COMPOUNDS IN THE ROCK AND FORM PHOSPHORIC ACID FROM THE CALCIUM PHOSPHATE IN THE ROCK, HEATING THE MIXTURE OF ROCK AND ACID TO A TEMPERATURE RANGING FROM ABOUT 200*C. TO 300*C. TO FORM A CLINKER, SAID MIXING AND HEATING STEPS VOLATILIZING ABOUT 90% OF THE FLUORINE IN THE PHOSPHATE ROCK TO FORM A CLINKER SUBSTANTIALLY FREE OF FLUORINE, AND LEACHING THE CLINKER WITH WATER TO FORM PHOSPHORIC ACID.
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) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |