US3795727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering pure aqueous solution of ferric chloride and aqueous solution of metal chlorides free of ferric chloride
Assignee: Kanto Denka Kogyo Co Ltd
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Filing: 1971-10-04
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Granted: 1974-03-05
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Expires: 1991-10-04
Abstract
Abstract AN AQUEOUS SOLUTION OF METAL CHLORIDES IS SUBJECTED TO LIQUID-LIQUID CONTACT WITH AN ALKYL, ARYL OR ARALKYL KETONE OR ETHER HAVING 4 TO 10 CARBON ATOMS SO THAT THE FERRIC CHLORIDE IS TRANSFERRED TO THE ORGANIC KETONE OR ETHER EXTRACTANT PHASE AND THE REMAINING METAL CHLORIDES REMAIN IN THE AQUEOUS PHASE. THE EXTRACTANT PHASE IS CONTACTED WITH WATER TO TRANSFER THE FERRIC CHLORIDE INTO A SECOND AQUEOUS PHASE.
Inventors
- 👤 T Yamamura
- 👤 Y Omote
- 👤 S Sato
- 👤 T Hiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:52
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/0009; C01G23/00; C01G23/001; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/306; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/01
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |