Patent US3378352A successfully refreshed from Google Patents.
US3378352A
Expired / Lapsed
US
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Process for extracting thorium and rare earths
Assignee: Dow Chemical Co
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Filing: 1965-12-15
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Granted: 1968-04-16
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Expires: 1985-12-15
Abstract
No abstract record available.
Inventors
- 👤 Robert D Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:16
CPC Classifications
C; C01; C01F; C01F15/00; C01F17/00; C01F17/10; C01F17/17; C01F17/20; C01F17/253; C01F17/271; C01F17/276; C22; C22B; C22B60/00; C22B60/02; C22B60/0291
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) | 1971-04-16 | 1971-10-16 | 1972-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-16 | 1975-10-16 | 1976-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-16 | 1979-10-16 | 1980-04-16 | $7700.00 | Window Closed / Lapsed |