US3777815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosive fracturing method
Assignee: CER GEONUCLEAR CORP
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Filing: 1970-06-17
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Granted: 1973-12-11
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Expires: 1990-06-17
Abstract
Abstract A FIRST EXPLOSIVE, PREFERABLY NUCLEAR, IS BURIED AT A SUFFICIENT DEPTH SO THAT ITS SUBSEQUENT DETONATION IS FULLY CONTAINED WITHIN THE EARTH. THEREAFTER A SECOND EXPLOSIVE, ALSO PREFERABLY NUCLEAR, IS BURIED A PREDETERMINED DISTANCE FROM THE SUITS OF THE FIRST EXPLOSIVE. AFTER DETONATION OF THE FIRST EXPLOSIVE, TIME IS ALLOWED TO ELAPSE DURING WHICH THE CALVIN FORMED BY THE FIRST EXPLOSIVE COLLAPSE TO FORM A RUBBLIZED CHMINEY. THEREAFTER THE SECOND EXPLOSIVE IS DETONATED TO CREATE A SECOND CHIMNEY PARALLEL TO THAT OF THE FIRST EXPLOSIVE TOGETHER WITH A ZONE OF ENHANCED PERMEABILITY BETWEEN THE FITST AND SECOND. D R A W I N G
Inventors
- 👤 C Boardman
- 👤 C Knutson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:53
CPC Classifications
F; F42; F42D; F42D1/00; E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/263; E21B43/2635; E21C; E21C41/00
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |