US3480082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In situ retorting of oil shale using co2 as heat carrier
Assignee: ConocoPhillips Co
•
Filing: 1967-09-25
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Granted: 1969-11-25
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Expires: 1987-09-25
Abstract
No abstract record available.
Inventors
- 👤 Harold E Gilliland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:46
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/164; E21B43/34; E21B43/40; Y; Y02; Y02P; Y02P90/00; Y02P90/70; Y10; Y10S; Y10S208/00; Y10S208/951
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3074877A
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US3303881A
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US3342257A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |