US3573005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cleaning phosphoric acid
Assignee: ISRAEL MINING IND INST FOR RES
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Filing: 1968-11-13
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Granted: 1971-03-30
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Expires: 1988-11-13
Abstract
Abstract PROCESS WHICH COMPRISES EXTRACTING TECHNICAL-GRADE PHOSPHORIC ACID BY SUBJECTING SAID TECHNICAL-GRADE PHOSPHORIC ACID, IN THE PRESENCE OF A MINOR PROPORTION OF ADDED SULFURIC ACID, TO EXTRACTION WITH A DISLKYL EITHER, SUCH AS DIISOPROPYL ETHER, SEPARATING A PHOSPHORIC ACID-CONTAINING ETHER EXTRACT, AND RECOVERING PURIFIED PHOSPHORIC ACID FROM SAID ETHER EXTRACT.
Inventors
- 👤 Avraham Matitiahu Baniel
- 👤 Ruth Blumberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:54
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |