US3437378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of oil from shale
Assignee: ConocoPhillips Co
•
Filing: 1967-02-21
•
Granted: 1969-04-08
•
Expires: 1987-02-21
Abstract
No abstract record available.
Inventors
- 👤 John H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:20
CPC Classifications
E; E21; E21C; E21C41/00; E21C41/16; E21C41/24; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/243
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1913395A
Cited
US1919636A
Cited
US2630306A
Cited
US2923535A
Cited
US3001775A
Cited
US3316020A
Cited
US3362751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |