Patent US2894722A successfully refreshed from Google Patents.
US2894722A
Expired / Lapsed
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Method and apparatus for providing a well bore with a deflected extension
Assignee: Individual
•
Filing: 1953-03-17
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Granted: 1959-07-14
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Expires: 1973-03-17
Abstract
No abstract record available.
Inventors
- 👤 Ralph Q Buttolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:26
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2197227A
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US2327658A
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US2298706A
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US2544979A
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US2656505A
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US2643859A
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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) | 1962-07-13 | 1963-01-12 | 1963-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-13 | 1967-01-12 | 1967-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-13 | 1971-01-12 | 1971-07-14 | $7700.00 | Window Closed / Lapsed |