US3460867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining and retorting of oil shale
Assignee: ERNEST E BURGH
•
Filing: 1965-10-24
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Granted: 1969-08-12
•
Expires: 1985-10-24
Abstract
No abstract record available.
Inventors
- 👤 Russell J Cameron
- 👤 Irvin P Nielsen
- 👤 Ernest E Burgh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:19
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/295
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1919636A
Cited
DE833334C
Cited
FR1038050A
Cited
SU117894A1
Cited
US3001776A
Cited
US3228468A
Cited
US3233668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-11 | 1973-02-10 | 1973-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-11 | 1977-02-10 | 1977-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-11 | 1981-02-10 | 1981-08-12 | $7700.00 | Window Closed / Lapsed |