US3455392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoaugmentation of oil production from subterranean reservoirs
Assignee: Shell USA Inc
•
Filing: 1968-02-28
•
Granted: 1969-07-15
•
Expires: 1988-02-28
Abstract
No abstract record available.
Inventors
- 👤 Michael Prats
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:37
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/2406
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2784787A
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US3180414A
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US3259186A
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US3333637A
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US3349849A
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US3361201A
Cited
US3354958A
Cited
US3358762A
Cited
US3409083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-14 | 1973-01-13 | 1973-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-14 | 1977-01-13 | 1977-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-14 | 1981-01-13 | 1981-07-15 | $7700.00 | Window Closed / Lapsed |