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Patent US3640336A successfully refreshed from Google Patents.
US3640336A
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Recovery of geothermal energy by means of underground nuclear detonations
Assignee: United States Atomic Energy Commission
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Filing: 1970-06-19
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Granted: 1972-02-08
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Expires: 1990-06-19
Abstract
Abstract Geothermal steam is generated by setting off an underground nuclear detonation above a naturally hot stratum of igneous rock and thereafter introducing water into the formation above the hot stratum which has been made permeable by the nuclear detonation.
Inventors
- 👤 Rod P Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:38
CPC Classifications
G; G21; G21J; G21J3/00; E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/263; E21B43/2635; F; F24; F24T; F24T10/00; F24T10/20; Y; Y02; Y02E; Y02E10/00; Y02E10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |