US2709070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible shaft and drain hole drilling apparatus
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1953-07-08
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Granted: 1955-05-24
•
Expires: 1973-07-08
Abstract
No abstract record available.
Inventors
- 👤 Walter J Bielstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:48
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/061; E21B17/00; E21B17/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2441719A
Cited
US2669429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |