US3767763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of sodium compounds
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-11-26
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Granted: 1973-10-23
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Expires: 1991-11-26
Abstract
Abstract THIS INVENTION RELATES TO THE USE OF ALIPHATIC TERTIARY CHELATING POLYAMINES FOR SEPARATING SODIUM COMPOUNDS FROM EITHER THEMSELVES OR FROM POTASSIUM SALTS, RUBIDIUM SALTS, CESIUM SALTS, LITHIUM SALTS HAVING A LATTICE ENERGY GREATER THAN ABOUT 220+10 KCAL./MOLE OR FROM GROUP II-A METAL SALTS.
Inventors
- 👤 W Bunting
- 👤 A Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:08
CPC Classifications
C; C07; C07F; C07F1/00; C07F1/02; B; B01; B01J; B01J45/00; C01; C01D; C01D3/00; C01D3/14; C01D3/18
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |