US3424254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic method and apparatus for drilling hot geothermal zones
Assignee: Individual
•
Filing: 1965-12-29
•
Granted: 1969-01-28
•
Expires: 1985-12-29
Abstract
No abstract record available.
Inventors
- 👤 Major Walter Huff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:00
CPC Classifications
F; F17; F17C; F17C9/00; F17C9/02; E; E21; E21B; E21B36/00; E21B36/003; E21B41/00; E21B41/02; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0109; F17C2203/00; F17C2203/03; F17C2203/0304; F17C2203/0345; F17C2203/035; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0323; F17C2221/00; F17C2221/01; F17C2221/016; F17C2221/017; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2227/00; F17C2227/01; F17C2227/0128; F17C2227/0135
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US616496A
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US2621022A
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US2915285A
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US2861780A
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US2905444A
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US3100528A
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US3301326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |