US3409077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal method of recovering hydrocarbons from an underground hydrocarbon-containing formation
Assignee: Shell USA Inc
•
Filing: 1966-09-29
•
Granted: 1968-11-05
•
Expires: 1986-09-29
Abstract
No abstract record available.
Inventors
- 👤 Robert W Durie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:20
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/243
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2862558A
Cited
US3042114A
Cited
US3093191A
Cited
US3010707A
Cited
US3150715A
Cited
US3196945A
Cited
US3193009A
Cited
US3284281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |