Patent US2647008A successfully refreshed from Google Patents.
US2647008A
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Retrieving arrangement for well drilling operations
Assignee: Tri State Oil Tools Inc
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Filing: 1950-08-10
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Granted: 1953-07-28
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Expires: 1970-08-10
Abstract
No abstract record available.
Inventors
- 👤 Leonard E Stewart
- 👤 Marvin J Winters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:48
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/12; E21B31/20; E21B31/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1479132A
Cited
US2190442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |