US3455646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating yttrium from rare earths by ion exchange
Assignee: Velsicol Chemical LLC
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Filing: 1966-09-26
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Granted: 1969-07-15
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Expires: 1986-09-26
Abstract
No abstract record available.
Inventors
- 👤 John R Morton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:24
CPC Classifications
C; C01; C01F; C01F17/00; C01F17/10; C01F17/13; C01F17/20; C01F17/206; C01F17/218; C01F17/30; C01F17/32
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) | 1972-07-14 | 1973-01-13 | 1973-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-14 | 1977-01-13 | 1977-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-14 | 1981-01-13 | 1981-07-15 | $7700.00 | Window Closed / Lapsed |