US3367749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purifying phosphoric acid using an amine extractant
Assignee: Monsanto Co
•
Filing: 1963-02-20
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Granted: 1968-02-06
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Expires: 1983-02-20
Abstract
No abstract record available.
Inventors
- 👤 Ernest L Koerner
- 👤 Saunders Elerington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:18
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/237; C01B25/2372; C01B25/46; C01B25/461; C01B25/466
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
THE METHOD OF PURIFYING PHOSPHORIC ACID BY REMOVING PHOSPHORIC ACID FROM CATIONIC OR METALLIC IMPURITIES, WHICH COMPRISES CONTACTING SAID ACID WITH A WATER-INSOLUBLE EXTRACTANT PHASE COMPRISED OF A LONG CHAIN HYDROCARBYL AMINE DISSOLVED IN AN ORGANIC DILUENT, SAID AMINE HAVING THE FORMULA R1-N(-R2)-R3 WHEREIN R1 AND R2 ARE MEMBERS SELECTED FROM THE CLASS CONSISTING OF SATURATED AND ETHYLENICALLY UNSATURATED ALIPHATIC HYDROCARBYL GROUPS CONTAINING FROM ABOUT 7 TO ABOUT 15 CARBON ATOMS ANR R3 IS A MEMBER SELECTED FROM THE CLASS CONSISTING OF HYDROGEN AND SATURATED AND ETHYLENICALLY UNSATURATED ALIPHATIC HYDROCARBLY GROUPS CONTAINING FROM 1 TO ABOUT 18 CARBON ATOMS, SAID EXTRACTANT PHASE BEING USED IN AMOUNTS SUFFICIENT TO EXTRACT SAID PHOSPHORIC ACID AND TO FORM A WATER-IMMISCIBLE EXTRACTANT PHASE, SEPARATING SAID EXTRACTANT PHASE AND SAID IMPURITIES AND REMOVING SAID PHOSPHORIC ACID FROM SAID EXTRACTANT PHASE BY CONTACTING WITH AN AQUEOUS SOLVENT.
Claim 2
Independent Claim
141 words
THE METHOD OF PURIFYING PHOSPHORIC ACID BY REMOVING PHOSPHORIC ACID FROM CATIONIC OR METALLIC IMPURITIES, WHICH COMPRISES CONTACTING SAID ACID WITH A WATER-INSOLUBLE EXTRACTANT PHASE COMPRISED OF A LONG CHAIN HYDROCARBYL AMINE DISSOLVED IN AN ORGANIC DILUENT, SAID AMINE HAVING THE FORMULA R1-N(-R2)-R3 WHEREIN R1 AND R2 ARE MEMBERS SELECTED FROM THE CLASS CONSISTING OF SATURATED AND ETHYLENICALLY UNSATURATED ALIPHATIC HYDROCARBYL GROUPS CONTAINING FROM ABOUT 7 TO ABOUT 15 CARBON ATOMS ANR R3 IS A MEMBER SELECTED FROM THE CLASS CONSISTING OF HYDROGEN AND SATURATED AND ETHYLENICALLY UNSATURATED ALIPHATIC HYDROCARBLY GROUPS CONTAINING FROM 1 TO ABOUT 18 CARBON ATOMS, SAID EXTRACTANT PHASE BEING USED IN AMOUNTS SUFFICIENT TO EXTRACT SAID PHOSPHORIC ACID AND TO FORM A WATER-IMMISCIBLE EXTRACTANT PHASE, SEPARATING SAID EXTRACTANT PHASE AND SAID IMPURITIES AND REMOVING SAID PHOSPHORIC ACID FROM SAID EXTRACTANT PHASE BY CONTACTING WITH AN AQUEOUS SOLVENT.
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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) | 1971-02-05 | 1971-08-07 | 1972-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-05 | 1975-08-07 | 1976-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-05 | 1979-08-07 | 1980-02-06 | $7700.00 | Window Closed / Lapsed |