US2643087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-powered rotary drilling apparatus
Assignee: Standard Oil Development Co
•
Filing: 1950-12-22
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Granted: 1953-06-23
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Expires: 1970-12-22
Abstract
No abstract record available.
Inventors
- 👤 Henry J Ogorzaly
- 👤 Ben W Sewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:33
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/18; E21B4/04
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) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |