US2905437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering drill pipe from wells
Assignee: DIA LOG TUBULAR SURVEY Co
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Filing: 1953-01-19
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Granted: 1959-09-22
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Expires: 1973-01-19
Abstract
No abstract record available.
Inventors
- 👤 Leo A Bell
- 👤 Edwin H Helm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:10
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/107; E21B31/1075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |