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Patent US2694549A successfully refreshed from Google Patents.
US2694549A
Expired / Lapsed
US
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Joint structure between flexible shafting and drill bit structure for drilling lateral bores
Assignee: Eastman Oil Well Survey Co
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Filing: 1952-01-21
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Granted: 1954-11-16
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Expires: 1972-01-21
Abstract
No abstract record available.
Inventors
- 👤 William G James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:18
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/05; E21B7/00; E21B7/04; E21B7/06; E21B7/061
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) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |