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US3411870A
Expired / Lapsed
US
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Purification of carnallite
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1966-01-28
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Granted: 1968-11-19
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Expires: 1986-01-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Eugene Richard Nightingale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:13
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; C22B26/22; C01; C01F; C01F5/00; C01F5/26; C01F5/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |