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Patent US3481695A successfully refreshed from Google Patents.
US3481695A
Expired / Lapsed
US
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Process for extracting aluminum values from oil shale
Assignee: United States Department of the Interior
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Filing: 1969-01-07
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Granted: 1969-12-02
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Expires: 1989-01-07
Abstract
No abstract record available.
Inventors
- 👤 Robert J Hite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:59
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/20; C01F7/04; C01F7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3389975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |