US3432257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of sulfonium salts in liquid/liquid metal extraction
Assignee: Shell USA Inc
•
Filing: 1966-12-27
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Granted: 1969-03-11
•
Expires: 1986-12-27
Abstract
No abstract record available.
Inventors
- 👤 Ernst L Th M Spitzer
- 👤 Johannes Radder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:26
CPC Classifications
C; C01; C01F; C01F5/00; C01G; C01G1/00; C01G3/00; C01G3/003; C01G49/00; C01G49/0009; C01G51/00; C01G51/01; C01G53/00; C01G53/01; 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)
US2909542A
Cited
US3216786A
Cited
US3082062A
Cited
US3128156A
Cited
US3251646A
Cited
US3131998A
Cited
US3336133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-10 | 1972-09-09 | 1973-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-10 | 1976-09-09 | 1977-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-10 | 1980-09-09 | 1981-03-11 | $7700.00 | Window Closed / Lapsed |