Patent US3694153A successfully refreshed from Google Patents.
US3694153A
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US
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Liquid-liquid extraction process for the purification of phosphoric acid
Assignee: Occidental Petroleum Corp
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Filing: 1970-10-30
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Granted: 1972-09-26
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Expires: 1990-10-30
Abstract
Abstract LIQUID WATER IMMISCIBLE ORGANIC SULFONIC ACIDS ARE USED TO EXTRACT METALLIC IMPURITIES FROM CRUDE PHOSPHORIC ACID SOLUTIONS CONTAINING UP TO 54% BY WEIGHT P2O5, BY A LIQUID-LIQUID EXTRACTION.
Inventors
- 👤 Kenneth A Williams
- 👤 David R Stern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:33
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/237; C01B25/238; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
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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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |