Patent US3151941A successfully refreshed from Google Patents.
US3151941A
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US
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Defluorination of peosphoric acid
Assignee: SMITH DOUGLASS CO Inc
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Filing: 1960-05-02
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Granted: 1964-10-06
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Expires: 1980-05-02
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
- 👤 Louis J Lamb
- 👤 Wiley C Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:36
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/2343; C01B25/22; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
PROCESS FOR CONCENTRATING AND DEFLUOURINATING FLUORIDE-CONTAINING AQUEOUS SOLUTIONS OF PHOSPHORIC ACID WHICH COMPRISES FORMING A MIXTURE OF THE FLUORIDE-CON TAINING AQUEOUS SOLUTION OF PHOSPHORIC ACID WITH AN AMOUNT OF A MINERAL ACID SELECTED FROM A GROUP CONSISTING OF HYDROCHLORIC ACID, NITRIC ACID AND PERCHLORIC ACID SUCH THAT THE WEIGHT RATIO OF SAID MINERAL ACID (CALCULATED AS EQUIVALENT HCI) TO PHOSPHORIC ACID (CALCULATED AS P2O5) IN THE MIXTURE IS AT LEAST ABOUT 0.1, HEATING THE AQUEOUS SOLUTION OF THE FLUORIDE-CONTAINING ACID MIXTURE TO A TEMPERATURE BETWEEN ABOUT 100* AND 500* F. TO VAPORIZE THE VOLATILE FLUORIDE CONSTITUENTS OF THE MIXTURE, AND RECOVERING THE RESULTING CONCENTRATED AND DEFLUORINATED PHOSPHORIC ACID PRODUCT.
Claim 2
Dependent Claim
109 words
PROCESS FOR CONCENTRATING AND DEFLUOURINATING FLUORIDE-CONTAINING AQUEOUS SOLUTIONS OF PHOSPHORIC ACID WHICH COMPRISES FORMING A MIXTURE OF THE FLUORIDE-CON TAINING AQUEOUS SOLUTION OF PHOSPHORIC ACID WITH AN AMOUNT OF A MINERAL ACID SELECTED FROM A GROUP CONSISTING OF HYDROCHLORIC ACID, NITRIC ACID AND PERCHLORIC ACID SUCH THAT THE WEIGHT RATIO OF SAID MINERAL ACID (CALCULATED AS EQUIVALENT HCI) TO PHOSPHORIC ACID (CALCULATED AS P2O5) IN THE MIXTURE IS AT LEAST ABOUT 0.1, HEATING THE AQUEOUS SOLUTION OF THE FLUORIDE-CONTAINING ACID MIXTURE TO A TEMPERATURE BETWEEN ABOUT 100* AND 500* F. TO VAPORIZE THE VOLATILE FLUORIDE CONSTITUENTS OF THE MIXTURE, AND RECOVERING THE RESULTING CONCENTRATED AND DEFLUORINATED PHOSPHORIC ACID PRODUCT.
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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) | 1967-10-06 | 1968-04-06 | 1968-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-06 | 1972-04-06 | 1972-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-06 | 1976-04-06 | 1976-10-06 | $7700.00 | Window Closed / Lapsed |