Patent US3796787A successfully refreshed from Google Patents.
US3796787A
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Metal extraction process
Assignee: Ashland LLC
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Filing: 1972-03-08
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Granted: 1974-03-12
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Expires: 1992-03-08
Abstract
Abstract SUBSTITUTED DIPHENYL SULFIDES SERVING AS EFFECTIVE IONIC EXTRACTANTS FOR THE RECOVERY OF METAL VALUES FROM DILUTE AQUEOUS SOLUTIONS THEREOF.
Inventors
- 👤 R Burrows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:13
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/005; C01G; C01G11/00; C01G3/00; C01G49/00; C01G49/0009; C01G49/009; C01G53/00; C01G53/01; C01G9/00; C01G9/003; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/34; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |